In this comprehensive guide, we compare Glean and Zendesk AI Agents across various parameters including features, pricing, performance, and customer support to help you make the best decision for your business needs.
Overview
When choosing between Glean and Zendesk AI Agents, understanding their unique strengths and architectural differences is crucial for making an informed decision. Both platforms serve the RAG (Retrieval-Augmented Generation) space but cater to different use cases and organizational needs.
Quick Decision Guide
Choose Glean if: you value permissions-aware ai is genuinely differentiated - real-time enforcement across 100+ datasources addresses critical enterprise concern
Choose Zendesk AI Agents if: you value enterprise-grade compliance: soc2, iso 27001, pci dss, fedramp, hipaa with baa
About Glean
Glean is enterprise work ai with permissions-aware rag across 100+ apps. Glean is a premium enterprise RAG platform with permissions-aware AI as its core differentiator. Founded by ex-Google Search engineers, Glean achieved $100M ARR in three years and a $7.2B valuation (2025). It connects 100+ enterprise apps with real-time access controls, supports 15+ LLMs, and offers comprehensive APIs with 4-language SDKs. Trade-offs: enterprise-only sales (~$50/user/month, ~$60K minimum), no consumer messaging channels, and premium positioning over plug-and-play simplicity. Founded in 2019, headquartered in Palo Alto, CA, the platform has established itself as a reliable solution in the RAG space.
Overall Rating
96/100
Starting Price
$50/mo
About Zendesk AI Agents
Zendesk AI Agents is enterprise cx platform with autonomous ai ticket resolution. Zendesk AI Agents is a purpose-built enterprise customer service AI platform trained on 19 billion historical tickets. It delivers autonomous ticket resolution with deep CX analytics, omnichannel support, and comprehensive compliance certifications (SOC2, HIPAA, FedRAMP), but uses outcome-based pricing ($1.50-$2.00 per resolution) rather than predictable flat rates. Founded in 2007, headquartered in San Francisco, CA, the platform has established itself as a reliable solution in the RAG space.
Overall Rating
84/100
Starting Price
$55/mo
Key Differences at a Glance
In terms of user ratings, Glean in overall satisfaction. From a cost perspective, pricing is comparable. The platforms also differ in their primary focus: Enterprise RAG versus Customer Service AI. These differences make each platform better suited for specific use cases and organizational requirements.
⚠️ What This Comparison Covers
We'll analyze features, pricing, performance benchmarks, security compliance, integration capabilities, and real-world use cases to help you determine which platform best fits your organization's needs. All data is independently verified from official documentation and third-party review platforms.
Detailed Feature Comparison
Glean
Zendesk AI Agents
CustomGPTRECOMMENDED
Data Ingestion & Knowledge Sources
100+ native connectors covering major enterprise categories
Cloud Storage: Google Drive, SharePoint, OneDrive, Dropbox, Box
Communication: Slack, Microsoft Teams, Gmail, Outlook, Zoom
CSV files: Requires title and content columns, supports HTML/Markdown
Web crawler: Maximum 15 sub-pages depth, configurable glob patterns
Note: No native PDF, Word (.docx), or plain text uploads - content must be formatted into CSV or published to help centers
Note: No Google Drive, Dropbox, or Notion integrations - requires third-party tools or CSV export
Note: No YouTube transcript ingestion
Retraining schedule: Daily, Weekly, Monthly, or one-time import with manual reimport option
80+ languages with automatic translation from English knowledge content
Note: Warning from Zendesk: "Having lots of sources can in some cases lead to reduced accuracy and increased latency"
Lets you ingest more than 1,400 file formats—PDF, DOCX, TXT, Markdown, HTML, and many more—via simple drag-and-drop or API.
Crawls entire sites through sitemaps and URLs, automatically indexing public help-desk articles, FAQs, and docs.
Turns multimedia into text on the fly: YouTube videos, podcasts, and other media are auto-transcribed with built-in OCR and speech-to-text.
View Transcription Guide
Connects to Google Drive, SharePoint, Notion, Confluence, HubSpot, and more through API connectors or Zapier.
See Zapier Connectors
Supports both manual uploads and auto-sync retraining, so your knowledge base always stays up to date.
L L M Model Options
Model Hub supports 15+ LLMs across multiple hosting providers
OpenAI: GPT-3.5, GPT-4
Azure OpenAI: GPT models
Google Vertex AI: Gemini 1.5 Pro
Amazon Bedrock: Claude 3 Sonnet
Per-step model selection: Different LLMs for each workflow step
Temperature controls: Factual, balanced, or creative output settings
Model tiers: Basic, Standard, Premium (premium consumes FlexCredits on Enterprise Flex)
Two access options: Glean Universal Key (managed) or Customer Key (BYOK)
Zero data retention: Customer data never used for model training
Automatic model updates: Deprecated models replaced with latest versions
Automatic routing: Optimizes using best-in-class models per query type
Slack integration (built by Zendesk): Bidirectional ticket management, ticket creation from message actions, Answer Bot auto-suggesting KB articles, Side Conversations for cross-team collaboration, multi-workspace support for Enterprise Grid
Zapier integration: Premium integration with triggers (new ticket, ticket updated, tag added), actions (create/update tickets and users), 63+ webhook combinations
1,400+ marketplace apps: 85% of customers use at least one technology partner integration
Server-to-server auth: Enables SSO bypass when needed
Chat widget UI customization: Primary color, message color, action color (hexadecimal), border radius (0-20px), position (bottom-left/right with offset)
Logo upload: 100kb limit
Custom title and sound notifications
Enterprise branding removal: Zendesk branding can be completely removed on Enterprise accounts
Tone presets: Professional (default), Informal, Enthusiastic, Custom
Answer length control: Very Short → Very Long (120-150 words)
Pronoun formality: Configurable per language
Guardrails via Instructions Feature (Advanced): Create rules for AI behavior, enforce style guide terminology, avoid specific phrases, enforce formatting
Safety guardrails: Ground responses in knowledge base content with option to restrict AI from answering without KB matches
PII masking and automatic redaction
Bot Builder limits: Up to 500 responses and 2,000 steps per bot with visual drag-and-drop editor
Dialogue Builder (Advanced tier): Hybrid flows combining generative AI with scripted responses
Fully white-labels the widget—colors, logos, icons, CSS, everything can match your brand.
White-label Options
Provides a no-code dashboard to set welcome messages, bot names, and visual themes.
Lets you shape the AI’s persona and tone using pre-prompts and system instructions.
Uses domain allowlisting to ensure the chatbot appears only on approved sites.
Core R A G Features
Hybrid search: Combines semantic (vector-based) and lexical (keyword) approaches
Knowledge Graph Framework: Proprietary anchors and signals across enterprise data
Rich, Scalable Crawler: Permission rule synchronization at scale
LLM Control Layer: Optimizes and controls LLM outputs
Encryption: AES-256 at rest, TLS 1.2+ in transit, FIPS-140 certified solutions
Data residency options: US, European Economic Area, Australia, Japan, UK (Data Center Location purchasable add-on, included in Suite plans)
Data training policy: AI trained on aggregate 19 billion historical tickets but does not access or use individual customer content for training beyond service delivery
PII protection: Automatic masking and redaction capabilities
Protects data in transit with SSL/TLS and at rest with 256-bit AES encryption.
Holds SOC 2 Type II certification and complies with GDPR, so your data stays isolated and private.
Security Certifications
Offers fine-grained access controls—RBAC, two-factor auth, and SSO integration—so only the right people get in.
No- Code Interface & Usability
Natural language agent configuration: Describe goals in plain language
Visual builder: Drag-and-drop workflow creation
AI-assisted creation: Glean suggests starting points and auto-generates draft agents
Agent Library: Pre-built templates for common use cases
30+ prebuilt agents: Sales, engineering, IT, HR use cases
RBAC hierarchy: Setup Admin, Admin, Super Admin with granular permissions
Embeddings control: Via Indexing API and custom datasources
Performance benchmarks: Strong (Forrester TEI, customer case studies)
Permissions & governance: Best-in-class (real-time enforcement, Active Data Governance)
Best for: Large enterprises requiring permissions-aware RAG with compliance needs
Not ideal for: SMBs with budget constraints, teams needing consumer messaging channels
Platform type: ENTERPRISE CUSTOMER EXPERIENCE PLATFORM WITH RAG (not pure RAG-as-a-Service) - comprehensive CX solution with integrated AI knowledge retrieval
Service Knowledge Graph: Proprietary knowledge management system storing customer data and content from internal systems with automatic content updates without manual reindexing
Content sources: Help Center articles, macros (templates), ticket data, custom objects, structured data (CSVs with title + content columns), public websites
Knowledge limitation: NO direct PDF, DOCX uploads or cloud storage integrations (Google Drive, Dropbox, Notion) - content must be in Zendesk ecosystem or published to help centers first
RAG architecture: Multi-model approach combining OpenAI GPT-4o, Claude 3 Sonnet/Opus, Google Gemini, and proprietary Zendesk LLM with automatic model routing based on query type
Performance benchmarks: 90%+ accuracy for single-turn questions but drops to 14.1% (GPT-4o) and 10.4% (Claude 3 Sonnet) for multi-turn conversations
Scale warning: Zendesk warns "Having lots of sources can in some cases lead to reduced accuracy and increased latency" indicating performance degradation concerns
Competitive performance: Intercom testing shows Zendesk achieves 78% answer rate for multi-source questions vs Fin's 96% - performance gap vs AI-first competitors
Enterprise compliance: Excellent - FedRAMP, HIPAA, SOC 2 Type II, ISO 27001, ISO 27701, PCI DSS Level 1 certifications for regulated industries
RAG-specific features: Ensures AI outputs grounded in customer-defined materials using RAG (Retrieval Augmented Generation) to ensure customers remain in control of how AI responds
Best for: Large enterprises requiring comprehensive customer service automation with strict compliance needs (healthcare, finance, government)
Not suitable for: General RAG API needs, document Q&A use cases, developer-centric knowledge base APIs, organizations needing direct cloud storage integrations
Core Architecture: Serverless RAG infrastructure with automatic embedding generation, vector search optimization, and LLM orchestration fully managed behind API endpoints
API-First Design: Comprehensive REST API with well-documented endpoints for creating agents, managing projects, ingesting data (1,400+ formats), and querying chat
API Documentation
Developer Experience: Open-source Python SDK (customgpt-client), Postman collections, OpenAI API endpoint compatibility, and extensive cookbooks for rapid integration
No-Code Alternative: Wizard-style web dashboard enables non-developers to upload content, brand widgets, and deploy chatbots without touching code
Hybrid Target Market: Serves both developer teams wanting robust APIs AND business users seeking no-code RAG deployment - unique positioning vs pure API platforms (Cohere) or pure no-code tools (Jotform)
RAG Technology Leadership: Industry-leading answer accuracy (median 5/5 benchmarked), 1,400+ file format support with auto-transcription, proprietary anti-hallucination mechanisms, and citation-backed responses
Benchmark Details
Deployment Flexibility: Cloud-hosted SaaS with auto-scaling, API integrations, embedded chat widgets, ChatGPT Plugin support, and hosted MCP Server for Claude/Cursor/ChatGPT
Enterprise Readiness: SOC 2 Type II + GDPR compliance, full white-labeling, domain allowlisting, RBAC with 2FA/SSO, and flat-rate pricing without per-query charges
Use Case Fit: Ideal for organizations needing both rapid no-code deployment AND robust API capabilities, teams handling diverse content types (1,400+ formats, multimedia transcription), and businesses requiring production-ready RAG without building ML infrastructure from scratch
Competitive Positioning: Bridges the gap between developer-first platforms (Cohere, Deepset) requiring heavy coding and no-code chatbot builders (Jotform, Kommunicate) lacking API depth - offers best of both worlds
Competitive Positioning
vs CustomGPT: Enterprise-premium vs developer-friendly; permissions-aware AI vs flexible customization
vs Zendesk: Enterprise search + RAG vs customer service platform
Unique strength: Real-time permissions-aware AI across 100+ datasources (no competitor matches this)
Target audience: Large enterprises (1K-100K users) with complex permission hierarchies
Omnichannel Dominance: Native integrations for WhatsApp (20 numbers), Facebook Messenger, Instagram, Twitter, WeChat, LINE, SMS, email, voice, live chat with unified agent workspace
1,400+ Marketplace Apps: 85% customer adoption of technology partner integrations (Salesforce, JIRA, Slack, Microsoft 365, AWS, SAP, Shopify)
Recent Acquisitions: HyperArc (GenAI analytics 2024), Local Measure (AI voice 2024-2025) demonstrate continued innovation investment
Rapid Model Deployment: Can test and deploy new models (e.g., OpenAI o3-mini, GPT-5) in under 24 hours for competitive advantage
vs AI-First Competitors: Intercom testing shows Zendesk 78% multi-source answer rate vs Fin's 96% - performance gap but broader platform capabilities
vs General RAG Platforms: Poor comparison - Zendesk is enterprise CX platform, not document Q&A tool like CustomGPT/YourGPT - fundamentally different categories
Pricing Disadvantage: Complex "famously complicated" pricing vs competitors' transparent per-seat or credit-based models - reviewers cite lack of clarity
Knowledge Base Lock-In: Content must be in Zendesk ecosystem (Help Center, CSV) - cannot directly access Google Docs, Notion, Confluence unlike eesel AI criticism
Strategic Positioning: Competes with Salesforce Service Cloud, Freshdesk, Intercom, Genesys for enterprise CX - NOT comparable to CustomGPT, YourGPT, or developer-focused RAG APIs
Best Fit Use Case: Large enterprises requiring comprehensive customer service automation with strict compliance needs (healthcare, finance, government); poor fit for general RAG, document Q&A, or developer-centric knowledge base APIs
Market position: Leading all-in-one RAG platform balancing enterprise-grade accuracy with developer-friendly APIs and no-code usability for rapid deployment
Target customers: Mid-market to enterprise organizations needing production-ready AI assistants, development teams wanting robust APIs without building RAG infrastructure, and businesses requiring 1,400+ file format support with auto-transcription (YouTube, podcasts)
Key competitors: OpenAI Assistants API, Botsonic, Chatbase.co, Azure AI, and custom RAG implementations using LangChain
Competitive advantages: Industry-leading answer accuracy (median 5/5 benchmarked), 1,400+ file format support with auto-transcription, SOC 2 Type II + GDPR compliance, full white-labeling included, OpenAI API endpoint compatibility, hosted MCP Server support (Claude, Cursor, ChatGPT), generous data limits (60M words Standard, 300M Premium), and flat monthly pricing without per-query charges
Pricing advantage: Transparent flat-rate pricing at $99/month (Standard) and $449/month (Premium) with generous included limits; no hidden costs for API access, branding removal, or basic features; best value for teams needing both no-code dashboard and developer APIs in one platform
Use case fit: Ideal for businesses needing both rapid no-code deployment and robust API capabilities, organizations handling diverse content types (1,400+ formats, multimedia transcription), teams requiring white-label chatbots with source citations for customer-facing or internal knowledge projects, and companies wanting all-in-one RAG without managing ML infrastructure
A I Models
Model Hub supports 15+ LLMs across multiple hosting providers with per-step model selection
OpenAI: GPT-3.5, GPT-4 via OpenAI or Azure OpenAI endpoints
Google Vertex AI: Gemini 1.5 Pro with multimodal capabilities
Amazon Bedrock: Claude 3 Sonnet for high-accuracy enterprise use cases
Temperature controls: Factual, balanced, or creative output settings per workflow
Model tiers: Basic, Standard, Premium (premium consumes FlexCredits on Enterprise Flex plan)
Two access options: Glean Universal Key (managed) or Customer Key (BYOK) for data sovereignty
Zero data retention: Customer data never used for model training with automatic model updates
Automatic routing: Optimizes using best-in-class models per query type for accuracy and cost
Multi-Model Architecture: Automatic routing across multiple LLM providers optimized for customer service use cases - users cannot manually select models
OpenAI GPT-4o: Rolled out May 2024 for enhanced reasoning and conversation quality
OpenAI GPT-4o Mini: Cost-optimized model for simpler queries and high-volume scenarios
Anthropic Claude 3: Available via Amazon Bedrock integration (announced April 2024) for advanced reasoning and safety
Proprietary Zendesk LLM: Trained on 19 billion CX-specific interactions for sentiment analysis, intent detection, and support scenario optimization (acquired via Cleverly in 2021)
Automatic Model Selection: System chooses optimal model based on use case, latency requirements, cost optimization, and quality benchmarks without user intervention
Rapid Model Deployment: Can test and deploy new models (e.g., OpenAI o3-mini) in under 24 hours for continuous improvement
CX-Specific Optimizations: Models fine-tuned for customer service context including sentiment analysis, urgency detection, ticket routing intelligence
Note: No Manual Model Control: Unlike competitors offering model selection, Zendesk handles routing automatically - limited flexibility for users preferring specific models
Primary models: GPT-5.1 and 4 series from OpenAI, and Anthropic's Claude 4.5 (opus and sonnet) for enterprise needs
Automatic model selection: Balances cost and performance by automatically selecting the appropriate model for each request
Model Selection Details
Proprietary optimizations: Custom prompt engineering and retrieval enhancements for high-quality, citation-backed answers
Managed infrastructure: All model management handled behind the scenes - no API keys or fine-tuning required from users
Anti-hallucination technology: Advanced mechanisms ensure chatbot only answers based on provided content, improving trust and factual accuracy
R A G Capabilities
Hybrid search: Combines semantic (vector-based) and lexical (keyword) approaches for maximum accuracy
Knowledge Graph Framework: Proprietary anchors and signals across enterprise data with rich, scalable crawler
LLM Control Layer: Optimizes and controls LLM outputs with permission-safe document retrieval and ranking
Real-time permissions enforcement: Users only see authorized content with identity crawling and connector-level permission mirroring
Context-aware query rewriting: LLM determines optimal query set with enterprise-specific rewrites
Hallucination prevention: RAG grounding, permission-aware retrieval, citation/source attribution for every answer
74% human-agreement rate on AI Evaluator benchmarks with 25% precision increases in customer case studies
141% ROI over 3 years: $15.6M NPV for composite organizations, 110 hours saved per employee annually (Forrester)
Permissions-aware AI (unique): Real-time access control enforcement across all 100+ datasources - no competitor matches this capability
CX-Focused RAG Architecture: Prioritizes structured help center content over raw document processing for customer service optimization
Unified Knowledge Graph: Combines help centers, community forums, external resources (Confluence, Salesforce Knowledge, Freshdesk) into single retrieval system
Automatic Indexing: Native Zendesk Help Center integration with automatic content synchronization and retraining schedules (Daily, Weekly, Monthly, one-time)
Third-Party Help Centers: Salesforce Knowledge, Freshdesk integration with Confluence OAuth 24-hour automatic sync
Web Crawler: Maximum 15 sub-pages depth with configurable glob patterns for website content ingestion
Mean Reciprocal Rank (MRR) Improvement: 7% improvement for English help centers demonstrating enhanced retrieval accuracy
80+ Languages Support: Automatic translation from English knowledge content for global customer service operations
QA Scoring: Built-in automatic scoring of 100% of AI agent interactions for quality assurance
Third-Party Testing: "No statistical difference in hallucination levels" compared to competitors when properly grounded (independent validation)
Note: Limited Document Format Support: No native PDF, Word (.docx), plain text uploads - content must be formatted into CSV or published to help centers first
Note: Performance Warning: Zendesk warns "Having lots of sources can in some cases lead to reduced accuracy and increased latency"
Note: No Cloud Storage Integration: No Google Drive, Dropbox, Notion integrations - requires third-party tools or CSV export workflows
Core architecture: GPT-4 combined with Retrieval-Augmented Generation (RAG) technology, outperforming OpenAI in RAG benchmarks
RAG Performance
Anti-hallucination technology: Advanced mechanisms reduce hallucinations and ensure responses are grounded in provided content
Benchmark Details
Automatic citations: Each response includes clickable citations pointing to original source documents for transparency and verification
Optimized pipeline: Efficient vector search, smart chunking, and caching for sub-second reply times
Scalability: Maintains speed and accuracy for massive knowledge bases with tens of millions of words
Context-aware conversations: Multi-turn conversations with persistent history and comprehensive conversation management
Source verification: Always cites sources so users can verify facts on the spot
Use Cases
Enterprise knowledge retrieval: Unified search across 100+ datasources (Google Drive, SharePoint, Confluence, Salesforce, Zendesk, GitHub, Slack) for 10K-100K user organizations
Permissions-aware search: Complex permission hierarchies requiring real-time enforcement - healthcare, finance, legal industries with sensitive data access controls
AI agents and automation: 30+ prebuilt agents for sales, engineering, IT, HR use cases with workflow automation capabilities
Developer-friendly RAG: Official SDKs (Python, Java, Go, TypeScript), LangChain integration, MCP Server for Claude Desktop/Cursor/VS Code
Active Data Governance: Continuous scanning with 100+ predefined infotypes (PII, PCI, M&A) and customizable policies with auto-hide
Cloud-Prem deployment: Customer-hosted in AWS or GCP for regulated industries requiring full data residency control
NOT suitable for: SMBs with <100 users or <$60K budgets, simple document Q&A without permission requirements, consumer messaging channels (WhatsApp, Telegram)
Autonomous Ticket Resolution: 50-90% automated ticket resolution rates depending on knowledge base quality - up to 80% of customer interactions handled end-to-end
Intelligent Triage & Routing: Automatically route Support and messaging tickets to right teams based on intent, language, sentiment - saves 45 seconds per issue (120 hours/month for average enterprise retailer)
Agent Assist (Zendesk Copilot): Proactive assistant providing insights, suggested replies, agent-approved actions in auto assist mode - Rotho's agents tripled productivity to 120 tickets/shift from 40
Voice & Call Automation: AI call center solutions with automatic after-call summaries, voice transcription for agent training, IVR integration
Knowledge Base Enhancement: Analyze help center article performance, flag outdated content, suggest new articles to fill gaps based on service data
Multilingual Global Support: 80+ languages with automatic translation from English knowledge base for worldwide customer service operations
Omnichannel Support: Unified agent workspace across WhatsApp (up to 20 numbers), Facebook Messenger, Instagram, Twitter DM, WeChat, LINE, SMS, email, voice, live chat
Customer support automation: AI assistants handling common queries, reducing support ticket volume, providing 24/7 instant responses with source citations
Internal knowledge management: Employee self-service for HR policies, technical documentation, onboarding materials, company procedures across 1,400+ file formats
Sales enablement: Product information chatbots, lead qualification, customer education with white-labeled widgets on websites and apps
Documentation assistance: Technical docs, help centers, FAQs with automatic website crawling and sitemap indexing
Educational platforms: Course materials, research assistance, student support with multimedia content (YouTube transcriptions, podcasts)
Healthcare information: Patient education, medical knowledge bases (SOC 2 Type II compliant for sensitive data)
E-commerce: Product recommendations, order assistance, customer inquiries with API integration to 5,000+ apps via Zapier
SaaS onboarding: User guides, feature explanations, troubleshooting with multi-agent support for different teams
Security & Compliance
SOC 2 Type II certified: Annual audits ensuring enterprise security standards
ISO 27001 certified: International information security management compliance
HIPAA compliant: Healthcare data protection standards for sensitive medical information
GDPR compliant: European data protection regulation adherence with data subject rights
TX-RAMP Level 2 certified: Texas state government security standard
NO FedRAMP certification: Not authorized for US federal government use
AES-256 encryption at rest, TLS 1.2+ in transit with automatic key rotation
Single-tenant infrastructure: Isolated environment per customer for maximum security
Zero data retention for LLMs: Customer data never used for model training with formal agreements
Cloud-Prem deployment: Customer-hosted in AWS or GCP for complete data residency control
Active Data Governance: Continuous scanning with 100+ predefined infotypes (PII, PCI, M&A), customizable policies, auto-hide
Permissions-aware AI: Real-time access control enforcement with zero-trust architecture meeting regulatory requirements
SOC 2 Type II Certification: Independently audited security controls and operational procedures with annual recertification
ISO Certifications: ISO 27001:2013 (Information Security), ISO 27018:2014 (Cloud Privacy), ISO 27701:2019 (Privacy Information Management)
PCI DSS Level 1 Certified: Highest level of payment card data security standard for financial transaction handling
FedRAMP LI-SaaS Authorized: Low Impact Software-as-a-Service authorization for US federal government deployments
HIPAA/HITECH Compliance: Healthcare data protection (requires Advanced Compliance add-on + Business Associate Agreement)
GDPR Compliance: European data protection with Binding Corporate Rules for cross-border data transfers
Additional Certifications: HDS (French health data hosting), FSQS (French secure cloud qualification)
Encryption Standards: AES-256 encryption at rest, TLS 1.2+ in transit, FIPS-140 certified cryptographic solutions
Data Residency Options: US, European Economic Area, Australia, Japan, UK (Data Center Location add-on, included in Suite plans)
AI Training Policy: Models trained on aggregate 19 billion historical tickets but do NOT access or use individual customer content for training beyond service delivery
PII Protection: Automatic masking and redaction capabilities for sensitive personal information
99.9% Uptime SLA: Maximum 10 hours scheduled maintenance annually with 48-hour advance notice
Compliance Leadership: Only platform with complete stack of FedRAMP + HIPAA + SOC2 + ISO 27001 + PCI DSS Level 1 certifications
Encryption: SSL/TLS for data in transit, 256-bit AES encryption for data at rest
SOC 2 Type II certification: Industry-leading security standards with regular third-party audits
Security Certifications
GDPR compliance: Full compliance with European data protection regulations, ensuring data privacy and user rights
Access controls: Role-based access control (RBAC), two-factor authentication (2FA), SSO integration for enterprise security
Data isolation: Customer data stays isolated and private - platform never trains on user data
Domain allowlisting: Ensures chatbot appears only on approved sites for security and brand protection
Secure deployments: ChatGPT Plugin support for private use cases with controlled access
Pricing & Plans
No public pricing - enterprise sales only with custom quotes
Estimated cost: ~$45-50+ per user/month based on third-party reports
Minimum ACV: ~$60K (approximately 100 users minimum for entry)
Per-seat model: Annual contracts based on number of users
No free trial: Paid POCs reportedly up to $70K for large enterprises
FlexCredits (Enterprise Flex): For premium LLM usage with consumption-based billing
Support tiers: Standard (24x5, included) or Premium (24x7 critical, additional fee)
Dedicated CSMs: Assigned to enterprise accounts with regular business reviews and hands-on onboarding
Pricing barrier: Excludes SMBs and startups - targets Fortune 500 and mid-market enterprises with 1K-100K users
Suite Team: $55/agent/month - Essential ticketing, email/voice/SMS channels, basic automation, 200 API requests/minute, online support
Suite Professional: $105/agent/month - Advanced automation, multilingual support (80+ languages), 700 API RPM, AI add-on available (~$50/agent/month)
Suite Enterprise: $150/agent/month - Custom workflows, advanced AI agents, 2,500 API RPM, dedicated account rep, custom branding removal, SLA guarantees, 24/7 support
AI Copilot Add-On: ~$50/agent/month (formerly "Advanced AI") for agent assist, intelligent triage, generative replies
Outcome-Based Pricing (November 2024): $2.00 per AI resolution (pay-as-you-go) or $1.50 per resolution (committed volume) - revolutionary usage-based pricing model
Real-World Cost Example: 20 agents on Suite Professional + AI add-on handling 5,000 AI resolutions/month = $127,200/year ($37,200 platform + $90,000 resolutions)
Note: High Total Cost: Can exceed $100,000/year for mid-sized deployments when combining seat-based fees with outcome-based AI resolution costs
Free Trial: 14-day trial with Suite Professional features, no credit card required for initial evaluation
Zendesk for Startups: 6-month extended trials for qualifying early-stage companies to reduce initial investment
Note: Complex Pricing: Mix of per-agent subscriptions, per-resolution AI fees, add-on charges creates opacity - reviewers describe as "money grab" and "famously complicated"
Note: All-Agent AI Requirement: AI add-on must be purchased for ALL agents, not selectively - cost-prohibitive for large teams needing limited AI access
Standard Plan: $99/month or $89/month annual - 10 custom chatbots, 5,000 items per chatbot, 60 million words per bot, basic helpdesk support, standard security
View Pricing
Premium Plan: $499/month or $449/month annual - 100 custom chatbots, 20,000 items per chatbot, 300 million words per bot, advanced support, enhanced security, additional customization
Enterprise Plan: Custom pricing - Comprehensive AI solutions, highest security and compliance, dedicated account managers, custom SSO, token authentication, priority support with faster SLAs
Enterprise Solutions
7-Day Free Trial: Full access to Standard features without charges - available to all users
Annual billing discount: Save 10% by paying upfront annually ($89/mo Standard, $449/mo Premium)
Flat monthly rates: No per-query charges, no hidden costs for API access or white-labeling (included in all plans)
Managed infrastructure: Auto-scaling cloud infrastructure included - no additional hosting or scaling fees
Support & Documentation
Standard support: 24x5 (Mon-Fri) via portal, email, Slack Connect channels
Premium support: 24x7 for critical issues with additional fee
Dedicated CSMs: Enterprise accounts with hands-on onboarding and regular business reviews
Excellent documentation: developers.glean.com with OpenAPI specs, CodeSandbox demos, comprehensive API references
Official SDKs: Python (pip install glean), Java (Maven), Go, TypeScript with async support and framework integrations
Web SDK: @gleanwork/web-sdk for embeddable components (chat, search, autocomplete, recommendations)
GitHub repositories: github.com/gleanwork with SDK repositories and sample projects
NO FedRAMP certification: Not suitable for US federal government deployments
Limited consumer channels: No native WhatsApp, Telegram integrations - designed for internal enterprise use only
Complex implementation: Initial indexing takes "few days" depending on data volume, requires enterprise IT coordination
Cross-language queries in early access: English query finding Spanish documents still in testing phase
Best for: Large enterprises (1K-100K users) with complex permission hierarchies, $60K+ budgets, and need for permissions-aware AI across 100+ datasources
NOT suitable for: SMBs, startups, simple document Q&A without permission requirements, organizations prioritizing transparent pricing
NOT a General-Purpose RAG Platform: Enterprise CX platform optimized for customer service - fundamentally different product category than CustomGPT or general RAG solutions
No Native Document Upload: No PDF, Word (.docx), or plain text file uploads - content must be formatted into CSV (title + content columns) or published to help centers first
No Cloud Storage Integration: No Google Drive, Dropbox, Notion integrations - requires third-party tools or manual CSV export workflows
No YouTube Transcript Ingestion: Cannot automatically ingest and process YouTube video transcripts for knowledge base
No Manual Model Selection: Automatic model routing only - users cannot manually select GPT-4o vs Claude 3 vs proprietary Zendesk LLM for specific use cases
Complex Pricing Structure: "Famously complicated" mix of per-agent subscriptions, per-resolution AI fees, add-on charges - reviewers describe as "money grab" with lack of transparency
High Total Cost of Ownership: Can exceed $100,000/year for mid-sized deployments (20 agents + 5K resolutions/month = $127K/year)
All-Agent AI Add-On Requirement: Advanced AI must be purchased for ALL agents, not selectively - cost-prohibitive for large teams needing limited AI functionality
Limited Customization: Pre-trained models with limited customization compared to open competitors - 95 G2 mentions cite "limited customization requiring extensive setup"
Steep Learning Curve: 102 G2 mentions note learning curve for advanced features - simple tasks easy, complex automation sometimes requires developer involvement
Knowledge Base Dependency: AI agents only effective if company knowledge is in Zendesk - cannot access Confluence, Google Docs, Notion directly (eesel AI criticism)
Multi-Turn Conversation Accuracy Drop: GPT-4o 14.1% accuracy for multi-turn conversations (down from 90%+ single-turn), Claude 3 Sonnet 10.4% - significant degradation
Source Overload Warning: Zendesk warns "Having lots of sources can in some cases lead to reduced accuracy and increased latency" - performance degrades with scale
No Testing in Sandbox: Some users report difficulties fully testing AI features in sandbox environments before production deployment
Unpredictable Outcome-Based Costs: $1.50-$2.00 per AI resolution makes monthly costs unpredictable - budget forecasting challenges vs fixed per-agent pricing
Competitive Disadvantages: Intercom testing shows Zendesk achieves 78% answer rate for multi-source questions vs Fin's 96% - performance gap vs AI-first competitors
Use Case Mismatch: Excellent for enterprise customer service automation with deep compliance requirements; poor fit for general RAG, document Q&A, or developer-centric knowledge base API needs
Managed service approach: Less control over underlying RAG pipeline configuration compared to build-your-own solutions like LangChain
Vendor lock-in: Proprietary platform - migration to alternative RAG solutions requires rebuilding knowledge bases
Model selection: Limited to OpenAI (GPT-5.1 and 4 series) and Anthropic (Claude, opus and sonnet 4.5) - no support for other LLM providers (Cohere, AI21, open-source models)
Pricing at scale: Flat-rate pricing may become expensive for very high-volume use cases (millions of queries/month) compared to pay-per-use models
Customization limits: While highly configurable, some advanced RAG techniques (custom reranking, hybrid search strategies) may not be exposed
Language support: Supports 90+ languages but performance may vary for less common languages or specialized domains
Real-time data: Knowledge bases require re-indexing for updates - not ideal for real-time data requirements (stock prices, live inventory)
Enterprise features: Some advanced features (custom SSO, token authentication) only available on Enterprise plan with custom pricing
Core Agent Features
Autonomous AI agents: Agents use AI to understand tasks and take action on behalf of users from answering questions and retrieving information to executing work autonomously
Natural language agent builder: Build agents by describing desired output in simple natural language - Glean understands goal and designs complex multi-step workflows
Agentic reasoning engine: LLM-agnostic engine enables agents to go beyond retrieval and generation - powers sophisticated automation and decision-making by understanding outcomes, building multi-step plans, and using action library
100+ native actions: Supports 100+ new native actions across Slack, Microsoft Teams, Salesforce, Jira, GitHub, Google Workspace and other applications
MCP host support: Gives agents dramatically larger surface area to operate across enterprise applications
Human-in-the-loop design: Agents can autonomously do work end-to-end with human review checkpoints - process customer support tickets, conduct research, prepare responses for employee review before execution
Vibe coding: Upgraded builder makes agent creation as simple as chatting - anyone (not just developers) can create and refine agents without understanding or interacting with code
Grounded in enterprise data: Autonomous agents grounded in most relevant authoritative information for confident work automation
Automatic agent triggering: Orchestrates agents automatically based on schedules or events and surfaces agent recommendations across enterprise
Visual and conversational workflow design: Turn ideas into structured workflows using simple natural language prompts or visual builder
Agentic AI architecture: Enables AI Agents to reason, adapt, and resolve issues end-to-end without manual setup or fixed flows
Unlike task-based bots: Follow predefined scripts - agentic AI makes it possible for AI agents to reason across problems, make decisions, and adapt as conversation evolves all the way to resolution
No scripting required: Handle complex requests without scripting or predefined flows - simply describe goal and agentic AI orchestrates steps, works across systems, adapts in real time to resolution
Automate over 50% of email interactions: Instantly with responses reflecting brand's tone and style
External knowledge access: AI agents access external knowledge like web crawlers to answer across channels
80 languages support: Native fluency that automatically switches based on customer input
Custom guidelines: Instructions for AI Agents allow setting custom guidelines keeping AI responses accurate, on-brand, and compliant
Automatic resolution validation: Built-in QA scoring for 100% of AI agent interactions
AI reasoning controls: Real-time visibility into AI agent's thinking showing how AI interprets customer requests and why AI chooses certain responses
60,000+ total service requests automated: Per quarter with 2,000+ workflow-heavy service requests automated per quarter - AI agents handling complex tasks that previously required human action
Custom AI Agents: Build autonomous agents powered by GPT-4 and Claude that can perform tasks independently and make real-time decisions based on business knowledge
Decision-Support Capabilities: AI agents analyze proprietary data to provide insights, recommendations, and actionable responses specific to your business domain
Multi-Agent Systems: Deploy multiple specialized AI agents that can collaborate and optimize workflows in areas like customer support, sales, and internal knowledge management
Memory & Context Management: Agents maintain conversation history and persistent context for coherent multi-turn interactions
View Agent Documentation
Tool Integration: Agents can trigger actions, integrate with external APIs via webhooks, and connect to 5,000+ apps through Zapier for automated workflows
Hyper-Accurate Responses: Leverages advanced RAG technology and retrieval mechanisms to deliver context-aware, citation-backed responses grounded in your knowledge base
Continuous Learning: Agents improve over time through automatic re-indexing of knowledge sources and integration of new data without manual retraining
Additional Considerations
Cannot create content directly: Glean focuses purely on search and retrieval - not suitable for organizations needing content creation within platform
Platform designed for large organizations: Feature set and pricing optimized for large enterprises - smaller teams may find it overkill and less cost-effective
AI production challenges: 68% of organizations report moving only 30% or fewer AI experiments into full production highlighting persistent scaling difficulties beyond proof-of-concept
Integration complexity: Requires strategic overhaul of processes to ensure seamless technology incorporation into existing workflows
Change management: Overcoming resistance to change demands strong leadership and commitment to fostering innovation and adaptability environment
Data reliability monitoring: Potential for inaccuracies in AI outputs necessitates rigorous monitoring frameworks to ensure data reliability and trustworthiness
Cybersecurity concerns: As AI deployment expands, cybersecurity threats become more pronounced requiring enhanced protective measures for sensitive information
Bias in AI models: Models can inadvertently learn and replicate biases in training data leading to unfair or discriminatory outcomes particularly in hiring, customer service, legal decisions
Training investment required: Enterprises must invest in training workforce to effectively use AI tools - upskilling employees, hiring AI talent, or partnering with consultants
Security risks and shadow IT: Many organizations hesitate due to uncertainties from security risks and shadow IT - ad hoc generative AI adoption comes with heavy risks and costs
Complex pricing structure: "Famously complicated" mix of per-agent subscriptions, per-resolution AI fees, add-on charges described as "money grab" with lack of transparency
High total cost of ownership: Can exceed $100,000/year for mid-sized deployments (20 agents + 5K resolutions/month = $127K/year)
All-agent AI requirement: Advanced AI must be purchased for ALL agents not selectively - cost-prohibitive for large teams needing limited AI functionality
Steep learning curve: 102 G2 mentions note learning curve for advanced features - simple tasks easy but complex automation sometimes requires developer involvement
Limited customization: Pre-trained models with limited customization compared to open competitors - 95 G2 mentions cite "limited customization requiring extensive setup"
Knowledge base dependency: AI agents only effective if company knowledge is in Zendesk - cannot access Confluence, Google Docs, Notion directly
Multi-turn accuracy drop: GPT-4o 14.1% accuracy for multi-turn conversations (down from 90%+ single-turn), Claude 3 Sonnet 10.4% - significant degradation
Source overload warning: Performance degrades with scale - "Having lots of sources can lead to reduced accuracy and increased latency"
Sandbox testing difficulties: Some users report difficulties fully testing AI features in sandbox environments before production deployment
Unpredictable outcome-based costs: $1.50-$2.00 per AI resolution makes monthly costs unpredictable - budget forecasting challenges
Use case mismatch: Excellent for enterprise customer service automation with deep compliance requirements but poor fit for general RAG, document Q&A, or developer-centric knowledge base API needs
Slashes engineering overhead with an all-in-one RAG platform—no in-house ML team required.
Gets you to value quickly: launch a functional AI assistant in minutes.
Stays current with ongoing GPT and retrieval improvements, so you’re always on the latest tech.
Balances top-tier accuracy with ease of use, perfect for customer-facing or internal knowledge projects.
Core Chatbot Features
Glean Chat interface: Primary interface for interacting with Glean Assistant offering familiar chat-like experience enabling natural conversations with company knowledge base
Multi-turn conversations: Supports conversational AI with natural language and context awareness maintaining context across conversation turns
Streaming responses: Real-time response streaming for better user experience with automatic source citations for transparency
Chatbot context understanding: Understands thread and sequence of conversations tracking references like "their" and "they" across multiple exchanges
Enterprise knowledge integration: Works across all company apps and knowledge sources including Microsoft 365, Google Workspace, Salesforce, Jira, GitHub and nearly 100 more applications
Personalization and security: Delivers answers highly customized to each user based on deep understanding of company content, employees, and activity while adhering to real-time enterprise data permissions and governance rules
Citation and transparency: Provides full linking to source information across documents, conversations and applications for transparency and trust
Simple chatbot API: Powerful tool for integrating conversational AI into products creating custom conversational interfaces leveraging Glean's AI capabilities
Use case flexibility: Build chatbots answering customer questions using help documentation, FAQs, knowledge bases or create internal tools helping employees find company policies, procedures, documentation
AI agents trained on 19 billion historical CX tickets
Unified knowledge graph: Combines help centers, community forums, and external resources
Visual bot builder: Drag-and-drop with no-code interface
3-click AI agent launch with generative replies
Intent suggestions: Automatically identify automation opportunities from ticket patterns
Knowledge Builder (Beta): Auto-generates KB content from ticket history
Generative Search: Quick Answers in help centers powered by AI
Real-time QA scoring: Automatic evaluation of 100% AI interactions
App Builder and Action Builder: Custom workflows without coding
Natural language report queries
Reduces hallucinations by grounding replies in your data and adding source citations for transparency.
Benchmark Details
Handles multi-turn, context-aware chats with persistent history and solid conversation management.
Speaks 90+ languages, making global rollouts straightforward.
Includes extras like lead capture (email collection) and smooth handoff to a human when needed.
Natural language configuration: Build and configure agents by describing goals in plain language without technical expertise
Visual builder option: Alternative drag-and-drop workflow creation for those preferring visual interface
AI-assisted creation: Glean suggests starting points and auto-generates draft agents based on description
Agent Library templates: 30+ prebuilt agents for sales, engineering, IT, HR use cases as starting points
Per-step model selection: Different LLMs for each workflow step with temperature controls (factual, balanced, creative)
Model tiers: Basic, Standard, Premium models with FlexCredits for premium consumption on Enterprise Flex
Two access options: Glean Universal Key (managed) or Customer Key (BYOK) for data sovereignty
Zero data retention: Customer data never used for model training with automatic model updates
RBAC hierarchy: Setup Admin, Admin, Super Admin roles with granular permissions
Process knowledge integration: Glean uses underlying process knowledge to inform agent design and workflow optimization
Instructions for AI Agents: Set custom guidelines to keep AI responses accurate, on-brand, and compliant
Action Builder: No-code integration and automation with new triggers, OpenAI connector, Slack and Salesforce steps, flow testing
Prebuilt connectors: Jira, Slack, Salesforce enable businesses to eliminate costly fragmentation and connect workflows across back-end systems without code
App Builder: No-code solution for building apps in Zendesk leveraging generative AI - admins can develop custom apps using natural language prompts
Service Knowledge Graph: Automatic content updates without manual reindexing for knowledge base management
Multi-model approach: Combines OpenAI GPT-4o, Claude 3 Sonnet/Opus, Google Gemini, proprietary Zendesk LLM with automatic routing
Rapid model deployment: Can test and deploy new models (e.g., OpenAI o3-mini, GPT-5) in under 24 hours for competitive advantage
AI reasoning controls: Real-time visibility into AI agent's thinking showing how AI interprets customer requests and response reasoning
Automatic resolution validation: Built-in QA scoring for 100% of AI agent interactions ensuring quality control
Custom objects: Structured data integration for domain-specific knowledge management
Resolution Platform architecture: Five components - AI Agents, Service Knowledge Graph, Actions & Integrations, Governance & Control, Measurement & Insights
Lets you add, remove, or tweak content on the fly—automatic re-indexing keeps everything current.
Shapes agent behavior through system prompts and sample Q&A, ensuring a consistent voice and focus.
Learn How to Update Sources
Supports multiple agents per account, so different teams can have their own bots.
Balances hands-on control with smart defaults—no deep ML expertise required to get tailored behavior.
Zendesk Resolution Platform (2025): Combines AI Agents, Knowledge Graph, and Governance
"Advanced AI" rebranded to "Zendesk Copilot"
Gartner recognition: Leader in 2025 Gartner Magic Quadrant for CRM Customer Engagement Center
N/A
Strategic Positioning
N/A
Enterprise CX platform, not general RAG solution - fundamentally different product category
19-billion-ticket training dataset: Largest CX-specific AI training corpus
Autonomous customer service resolution: 50-90% ticket resolution rates with deep analytics
Compliance-first architecture: Only platform with FedRAMP + HIPAA + SOC2 + ISO 27001 + PCI DSS Level 1
100,000+ customers worldwide including Mercedes-Benz, Shopify, Uber, Slack, Airbnb
Note: Poor fit for general RAG use cases: No PDF/Word ingestion, locked model selection, unpredictable outcome-based pricing
Strategic choice depends on use case: Customer service automation with enterprise requirements favors Zendesk; general-purpose RAG with document flexibility favors alternatives
After analyzing features, pricing, performance, and user feedback, both Glean and Zendesk AI Agents are capable platforms that serve different market segments and use cases effectively.
When to Choose Glean
You value permissions-aware ai is genuinely differentiated - real-time enforcement across 100+ datasources addresses critical enterprise concern
CX-specific AI trained on 19 billion tickets with 90%+ single-turn accuracy
Best For: Enterprise-grade compliance: SOC2, ISO 27001, PCI DSS, FedRAMP, HIPAA with BAA
Migration & Switching Considerations
Switching between Glean and Zendesk AI Agents requires careful planning. Consider data export capabilities, API compatibility, and integration complexity. Both platforms offer migration support, but expect 2-4 weeks for complete transition including testing and team training.
Pricing Comparison Summary
Glean starts at $50/month, while Zendesk AI Agents begins at $55/month. Total cost of ownership should factor in implementation time, training requirements, API usage fees, and ongoing support. Enterprise deployments typically see annual costs ranging from $10,000 to $500,000+ depending on scale and requirements.
Our Recommendation Process
Start with a free trial - Both platforms offer trial periods to test with your actual data
Define success metrics - Response accuracy, latency, user satisfaction, cost per query
Test with real use cases - Don't rely on generic demos; use your production data
Evaluate total cost - Factor in implementation time, training, and ongoing maintenance
Check vendor stability - Review roadmap transparency, update frequency, and support quality
For most organizations, the decision between Glean and Zendesk AI Agents comes down to specific requirements rather than overall superiority. Evaluate both platforms with your actual data during trial periods, focusing on accuracy, latency, ease of integration, and total cost of ownership.
📚 Next Steps
Ready to make your decision? We recommend starting with a hands-on evaluation of both platforms using your specific use case and data.
• Review: Check the detailed feature comparison table above
• Test: Sign up for free trials and test with real queries
• Calculate: Estimate your monthly costs based on expected usage
• Decide: Choose the platform that best aligns with your requirements
Last updated: December 11, 2025 | This comparison is regularly reviewed and updated to reflect the latest platform capabilities, pricing, and user feedback.
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DevRel at CustomGPT.ai. Passionate about AI and its applications. Here to help you navigate the world of AI tools and make informed decisions for your business.
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