What are the main differences between CustomGPT and Glean?

CustomGPT excels in Industry-leading accuracy with 97% benchmark score and Patented technology to reduce hallucinations, scoring 94/100 in user ratings with 97% accuracy. Glean leads in Permissions-aware AI is genuinely differentiated - real-time enforcement across 100+ datasources addresses critical enterprise concern and Strong developer experience - comprehensive APIs, 4-language SDKs (Python, Java, Go, TypeScript), LangChain integration with 96/100 overall rating and 90% accuracy. Key technical difference: CustomGPT focuses on No-code chatbot builder while Glean emphasizes Permissions-aware AI with real-time access control enforcement. Pricing differs by $49/month.

Which is better for enterprises: CustomGPT or Glean?

CustomGPT offers SOC 2 compliance for enterprise security. HIPAA compliance is available in Glean. For scalability, both offer cloud-based deployment options. Glean leads with 96/100 enterprise readiness score (98/100 enterprise features).

How much does CustomGPT cost vs Glean?

CustomGPT starts at $99/monthly (freemium model), while Glean begins at $50/monthly (enterprise model). Both require paid plans, and free trials are available. Pricing is relatively comparable. See our detailed pricing breakdown for complete tier comparisons.

Can I migrate from CustomGPT to Glean?

Migration from CustomGPT to Glean typically requires API-based data export/import, which Glean provides. Glean provides comprehensive API access excellent documentation for the migration process. Estimated migration time: 1-2 days for cloud setup. Contact Glean support for migration assistance and best practices.

What integrations do CustomGPT and Glean support?

CustomGPT integrates with Direct sitemap (Auto-sync), Wordpress(Auto-sync), Wix(Auto-sync), YouTube (Auto-sync), Hubspot Knowledge Base (Auto-sync) (13 integrations total). Glean supports Cloud Storage: Google Drive, SharePoint, OneDrive, Dropbox, Box, Communication: Slack (full bot support), Microsoft Teams, Gmail, Outlook, Zoom, Collaboration: Confluence, Notion, Jira, GitHub, GitLab, Miro, CRM/Support: Salesforce, ServiceNow, Zendesk, Identity: Okta, Microsoft Entra ID, Google Workspace, OneLogin (8 integrations available). Both offer REST APIs for custom integrations. CustomGPT offers 63% more integrations, with webhook support for real-time data sync.

What are the main differences between CustomGPT and Glean?

CustomGPT offers strong capabilities, scoring 0/100 in user ratings. Glean provides unique strengths with 0/100 overall rating. Key technical difference: CustomGPT focuses on advanced features while Glean emphasizes specialized capabilities.

Which is better for enterprises: CustomGPT or Glean?

Both platforms provide enterprise-grade security. HIPAA compliance varies - contact vendors for details. For scalability, both offer cloud-based deployment options. Glean leads with strong/100 enterprise readiness score.

How much does CustomGPT cost vs Glean?

CustomGPT starts at custom pricing/month (subscription model), while Glean begins at contact sales/month (subscription model). Both require paid plans. Pricing is relatively comparable. See our detailed pricing breakdown for complete tier comparisons.

Can I migrate from CustomGPT to Glean?

Migration from CustomGPT to Glean typically requires manual data transfer since API access may be limited. Glean offers standard documentation for the migration process. Estimated migration time: 1-2 days for cloud setup. Contact Glean support for migration assistance and best practices.

What integrations do CustomGPT and Glean support?

CustomGPT integrates with (multiple platforms). Glean supports (various tools). API availability varies by plan. Integration coverage is comparable.

CustomGPT vs Glean

Make an informed decision with our comprehensive comparison. Discover which RAG solution perfectly fits your needs.

More about Glean More about CustomGPT Get Started Today

Priyansh KhodiyarDevRel at CustomGPT.ai

Fact checked and reviewed by Bill Cava

Published: 01.04.2025Updated: 25.04.2025

In this comprehensive guide, we compare CustomGPT and Glean 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 CustomGPT and Glean, 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 CustomGPT if: you value industry-leading accuracy with 97% benchmark score
Choose Glean if: you value permissions-aware ai is genuinely differentiated - real-time enforcement across 100+ datasources addresses critical enterprise concern

About CustomGPT

CustomGPT is most accurate rag-as-a-service api for business. CustomGPT is the #1 benchmarked RAG platform that enables businesses to create powerful AI assistants trained on their specific data, offering industry-leading accuracy with reduced hallucinations and seamless integration capabilities. Founded in 2021, headquartered in Needham, Massachusetts, United States, the platform has established itself as a reliable solution in the RAG space.

Overall Rating

94/100

Starting Price

$99/mo

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

Key Differences at a Glance

In terms of user ratings, both platforms score similarly in overall satisfaction. From a cost perspective, Glean offers more competitive entry pricing. The platforms also differ in their primary focus: AI Chatbot versus Enterprise RAG. 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

Features	CustomGPT	Glean
Data Ingestion & Knowledge Sources	1,400+ file formats – PDF, DOCX, Excel, PowerPoint, Markdown, HTML + auto-extraction from ZIP/RAR/7Z archives Website crawling – Sitemap indexing with configurable depth for help docs, FAQs, and public content Multimedia transcription – AI Vision, OCR, YouTube/Vimeo/podcast speech-to-text built-in Cloud integrations – Google Drive, SharePoint, OneDrive, Dropbox, Notion with auto-sync Knowledge platforms – Zendesk, Freshdesk, HubSpot, Confluence, Shopify connectors Massive scale – 60M words (Standard) / 300M words (Premium) per bot with no performance degradation	✅ 100+ native connectors – Cloud storage, CRM, collaboration platforms plus Indexing API File formats – PDFs, Word, HTML, spreadsheets, structured data Real-time sync – Content within minutes, permission changes immediate ⚠️ Initial indexing – Few days depending on volume Scale – 10K-100K users, hundreds of millions of documents
Integrations & Channels	Website embedding – Lightweight JS widget or iframe with customizable positioning CMS plugins – WordPress, WIX, Webflow, Framer, SquareSpace native support 5,000+ app ecosystem – Zapier connects CRMs, marketing, e-commerce tools MCP Server – Integrate with Claude Desktop, Cursor, ChatGPT, Windsurf OpenAI SDK compatible – Drop-in replacement for OpenAI API endpoints LiveChat + Slack – Native chat widgets with human handoff capabilities	Slack & Teams – Official apps, Gleanbot auto-responses, Real-Time Search API Browser extensions – Chrome (300K+ users), Firefox, Safari, Edge ⚠️ No WhatsApp/Telegram – Designed for internal enterprise use only SSO protocols – OIDC, SAML 2.0 with Okta, Microsoft Entra
Core Chatbot Features	✅ #1 accuracy – Median 5/5 in independent benchmarks, 10% lower hallucination than OpenAI ✅ Source citations – Every response includes clickable links to original documents ✅ 93% resolution rate – Handles queries autonomously, reducing human workload ✅ 92 languages – Native multilingual support without per-language config ✅ Lead capture – Built-in email collection, custom forms, real-time notifications ✅ Human handoff – Escalation with full conversation context preserved	Glean Chat interface – Natural conversations with company knowledge Multi-turn conversations – Context awareness across turns Streaming responses – Real-time with source citations
Customization & Branding	Full white-labeling included – Colors, logos, CSS, custom domains at no extra cost 2-minute setup – No-code wizard with drag-and-drop interface Persona customization – Control AI personality, tone, response style via pre-prompts Visual theme editor – Real-time preview of branding changes Domain allowlisting – Restrict embedding to approved sites only	UI customization – Custom logos, color schemes, background images Custom subdomains – your-company.glean.com Chat widget styling – CSS positioning, width/height, custom containers ⚠️ Limited white-labeling – Glean branding may remain visible
L L M Model Options	GPT-5.1 models – Latest thinking models (Optimal & Smart variants) GPT-4 series – GPT-4, GPT-4 Turbo, GPT-4o available Claude 4.5 – Anthropic's Opus available for Enterprise Auto model routing – Balances cost/performance automatically Zero API key management – All models managed behind the scenes	✅ 15+ LLMs supported – GPT-4, Gemini 1.5 Pro, Claude 3 Sonnet Per-step model selection – Different LLMs for each workflow step Temperature controls – Factual, balanced, or creative output settings BYOK support – Glean Universal Key or Customer Key options Automatic routing – Zero data retention, optimizes top models per query
Developer Experience ( A P I & S D Ks)	REST API – Full-featured for agents, projects, data ingestion, chat queries Python SDK – Open-source `customgpt-client` with full API coverage Postman collections – Pre-built requests for rapid prototyping Webhooks – Real-time event notifications for conversations and leads OpenAI compatible – Use existing OpenAI SDK code with minimal changes	✅ Client & Indexing APIs – Search, Chat, Agents, Documents, Governance Official SDKs – Python, Java, Go, TypeScript with async support Web SDK – Embeddable chat, search, autocomplete, recommendations components Framework integrations – LangChain, CrewAI, OpenAI Assistants, MCP Server Authentication – OAuth 2.0, user-scoped tokens, impersonation support
Performance & Accuracy	Sub-second responses – Optimized RAG with vector search and multi-layer caching Benchmark-proven – 13% higher accuracy, 34% faster than OpenAI Assistants API Anti-hallucination tech – Responses grounded only in your provided content OpenGraph citations – Rich visual cards with titles, descriptions, images 99.9% uptime – Auto-scaling infrastructure handles traffic spikes	✅ 74% human-agreement rate – 25% precision increases 141% ROI over 3 years – Forrester Total Economic Impact 110 hours saved per employee annually – Productivity gains Hallucination prevention – RAG grounding, permissions, citations
Security & Compliance	SOC 2 Type II + GDPR – Regular third-party audits, full EU compliance 256-bit AES encryption – Data at rest; SSL/TLS in transit SSO + 2FA + RBAC – Enterprise access controls with role-based permissions Data isolation – Never trains on customer data Domain allowlisting – Restrict chatbot to approved domains	✅ SOC 2 Type II, ISO 27001, HIPAA, GDPR ⚠️ NO FedRAMP – Not for US federal government Single-tenant – Isolated per customer, Cloud-Prem option
Pricing & Plans	Standard: $99/mo – 10 chatbots, 60M words, 5K items/bot Premium: $449/mo – 100 chatbots, 300M words, 20K items/bot Enterprise: Custom – SSO, dedicated support, custom SLAs 7-day free trial – Full Standard access, no charges Flat-rate pricing – No per-query charges, no hidden costs	⚠️ No public pricing – Enterprise sales only ~$45-50+/user/month – Estimated cost from reports ~$60K minimum ACV – Approximately 100 users minimum
Support & Ecosystem	Comprehensive docs – Tutorials, cookbooks, API references Email + in-app support – Under 24hr response time Premium support – Dedicated account managers for Premium/Enterprise Open-source SDK – Python SDK, Postman, GitHub examples 5,000+ Zapier apps – CRMs, e-commerce, marketing integrations	Standard support – 24x5 via portal, email, Slack Connect Premium support – 24x7 critical issues with additional fee ✅ Excellent documentation – developers.glean.com with OpenAPI specs GitHub repositories – SDK examples and sample projects
Observability & Monitoring	Real-time dashboard – Query volumes, token usage, response times Customer Intelligence – User behavior patterns, popular queries, knowledge gaps Conversation analytics – Full transcripts, resolution rates, common questions Export capabilities – API export to BI tools and data warehouses	Insights Dashboard – DAU/WAU/MAU, Search Session Satisfaction metrics Usage metrics – Searches and chats per user per week 270-day data retention – Department-level filtering Audit logging – User activity, access patterns, SIEM export
Use Cases	Customer support – 24/7 AI handling common queries with citations Internal knowledge – HR policies, onboarding, technical docs Sales enablement – Product info, lead qualification, education Documentation – Help centers, FAQs with auto-crawling E-commerce – Product recommendations, order assistance	Enterprise knowledge – Unified search across 100+ datasources Permissions-aware – Healthcare, finance, legal hierarchies AI agents – 30+ prebuilt for sales, engineering, IT
Limitations & Considerations	Managed service – Less control over RAG pipeline vs build-your-own Model selection – OpenAI + Anthropic only; no Cohere, AI21, open-source Real-time data – Requires re-indexing; not ideal for live inventory/prices Enterprise features – Custom SSO only on Enterprise plan	⚠️ High cost barrier – ~$50/user/month, ~$60K minimum ⚠️ NO FedRAMP – Not for US federal government ⚠️ No consumer channels – No WhatsApp, Telegram Complex implementation – Indexing takes days
Core Agent Features	Custom AI Agents – Autonomous GPT-4/Claude agents for business tasks Multi-Agent Systems – Specialized agents for support, sales, knowledge Memory & Context – Persistent conversation history across sessions Tool Integration – Webhooks + 5,000 Zapier apps for automation Continuous Learning – Auto re-indexing without manual retraining	✅ Autonomous AI agents – Understand tasks, execute autonomously Natural language builder – Describe goals, auto-designs workflows 100+ native actions – Slack, Teams, Salesforce, Jira, GitHub
R A G Capabilities	GPT-4 + RAG – Outperforms OpenAI in independent benchmarks Anti-hallucination – Responses grounded in your content only Automatic citations – Clickable source links in every response Sub-second latency – Optimized vector search and caching Scale to 300M words – No performance degradation at scale	✅ Hybrid search – Semantic + lexical for accuracy Knowledge Graph Framework – Proprietary anchors across data 74% human-agreement – 25% precision increases
Competitive Positioning	Market position – Leading RAG platform balancing enterprise accuracy with no-code usability. Trusted by 6,000+ orgs including Adobe, MIT, Dropbox. Key differentiators – #1 benchmarked accuracy • 1,400+ formats • Full white-labeling included • Flat-rate pricing vs OpenAI – 10% lower hallucination, 13% higher accuracy, 34% faster vs Botsonic/Chatbase – More file formats, source citations, no hidden costs vs LangChain – Production-ready in 2 min vs weeks of development	✅ Unique strength – Real-time permissions-aware AI across 100+ datasources Proven ROI – 141% ROI, 110 hours/employee saved ⚠️ Pricing barrier – ~$50/user/month, ~$60K minimum
R A G-as-a- Service Assessment	Platform type – TRUE RAG-AS-A-SERVICE with managed infrastructure API-first – REST API, Python SDK, OpenAI compatibility, MCP Server No-code option – 2-minute wizard deployment for non-developers Hybrid positioning – Serves both dev teams (APIs) and business users (no-code) Enterprise ready – SOC 2 Type II, GDPR, WCAG 2.0, flat-rate pricing	✅ TRUE RAG PLATFORM – API-first with comprehensive tools Data flexibility – 100+ connectors, Indexing API Best for – Large enterprises requiring permissions-aware RAG
A I Models	OpenAI – GPT-5.1 (Optimal/Smart), GPT-4 series Anthropic – Claude 4.5 Opus/Sonnet (Enterprise) Auto-routing – Intelligent model selection for cost/performance Managed – No API keys or fine-tuning required	✅ 15+ LLMs – GPT-4, Gemini 1.5 Pro, Claude 3 with per-step selection Temperature controls – Factual, balanced, or creative output BYOK support – Customer Key for data sovereignty
No- Code Interface & Usability	2-minute deployment – Fastest time-to-value in the industry Wizard interface – Step-by-step with visual previews Drag-and-drop – Upload files, paste URLs, connect cloud storage In-browser testing – Test before deploying to production Zero learning curve – Productive on day one	✅ Natural language configuration – Describe goals in plain language Visual builder – Drag-and-drop workflow creation AI-assisted creation – Auto-generates draft agents 30+ prebuilt agents – Sales, engineering, IT, HR
Customization & Flexibility ( Behavior & Knowledge)	Live content updates – Add/remove content with automatic re-indexing System prompts – Shape agent behavior and voice through instructions Multi-agent support – Different bots for different teams Smart defaults – No ML expertise required for custom behavior	Natural language config – Build agents without technical expertise Visual builder – Drag-and-drop workflow creation 30+ templates – Sales, engineering, IT, HR
Pricing & Scalability	Standard: $99/mo – 60M words, 10 bots Premium: $449/mo – 300M words, 100 bots Auto-scaling – Managed cloud scales with demand Flat rates – No per-query charges	⚠️ No public pricing – Enterprise sales only Estimated cost – ~$45-50+ per user/month Minimum ACV – ~$60K (approximately 100 users minimum) No free trial – Paid POCs up to $70K Annual contracts – Per-seat model, 7-12% renewal increases, FlexCredits for premium
Security & Privacy	SOC 2 Type II + GDPR – Third-party audited compliance Encryption – 256-bit AES at rest, SSL/TLS in transit Access controls – RBAC, 2FA, SSO, domain allowlisting Data isolation – Never trains on your data	✅ SOC 2 Type II, ISO 27001, HIPAA, GDPR ⚠️ No FedRAMP – Not for US federal government AES-256 at rest, TLS 1.2+ in transit Single-tenant – Isolated per customer, Cloud-Prem option
Support & Documentation	Documentation hub – Docs, tutorials, API references Support channels – Email, in-app chat, dedicated managers (Premium+) Open-source – Python SDK, Postman, GitHub examples Community – User community + 5,000 Zapier integrations	24x5 standard support – Portal, email, Slack Connect ✅ Excellent documentation – developers.glean.com with OpenAPI Official SDKs – Python, Java, Go, TypeScript
Additional Considerations	Time-to-value – 2-minute deployment vs weeks with DIY Always current – Auto-updates to latest GPT models Proven scale – 6,000+ organizations, millions of queries Multi-LLM – OpenAI + Claude reduces vendor lock-in	⚠️ Cannot create content directly – Focuses on search/retrieval Large organization focus – May be overkill for smaller teams Training investment – Upskilling employees needed
Core R A G Features	N/A	✅ Hybrid search – Semantic (vector-based) + lexical (keyword) approaches Knowledge Graph Framework – Proprietary anchors across enterprise data LLM Control Layer – Optimizes outputs with context-aware query rewriting Grounded answers – Source citations with every response
Permissions- Aware A I ( Core Differentiator)	N/A	✅ Real-time access control – Across all 100+ datasources Identity crawling – Users, groups, memberships, permission models Connector-level mirroring – Respects native permissions (Salesforce, GDrive) Zero-trust architecture – Users only see authorized content
Multi- Language & Localization	N/A	Full support – English, German, Japanese (semantic, assistant, UI) Partial support – French, Spanish 20+ languages – Early access or keyword search
Conversation & Agent Features	N/A	Conversation history – Thread tracking in Slack, History tab Version control – All agent versions auto-saved ⚠️ No lead capture – Designed for internal enterprise use
Deployment Options	N/A	Cloud (SaaS) – Standard Glean infrastructure deployment Cloud-Prem – Customer-hosted in AWS or GCP Single-tenant architecture – Isolated per customer

Final Thoughts

Final Verdict: CustomGPT vs Glean

After analyzing features, pricing, performance, and user feedback, both CustomGPT and Glean are capable platforms that serve different market segments and use cases effectively.

When to Choose CustomGPT

You value industry-leading accuracy with 97% benchmark score
Patented technology to reduce hallucinations
Easy no-code setup with powerful customization

Best For: Industry-leading accuracy with 97% benchmark score

When to Choose Glean

You value permissions-aware ai is genuinely differentiated - real-time enforcement across 100+ datasources addresses critical enterprise concern
Strong developer experience - comprehensive APIs, 4-language SDKs (Python, Java, Go, TypeScript), LangChain integration
Model flexibility without vendor lock-in - 15+ LLMs with per-step selection and bring-your-own-key option

Best For: Permissions-aware AI is genuinely differentiated - real-time enforcement across 100+ datasources addresses critical enterprise concern

Migration & Switching Considerations

Switching between CustomGPT and Glean 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

CustomGPT starts at $99/month, while Glean begins at $50/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 CustomGPT and Glean 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: January 19, 2026 | This comparison is regularly reviewed and updated to reflect the latest platform capabilities, pricing, and user feedback.

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The most accurate RAG-as-a-Service API. Deliver production-ready reliable RAG applications faster. Benchmarked #1 in accuracy and hallucinations for fully managed RAG-as-a-Service API.

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Priyansh Khodiyar

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.

CustomGPT vs Glean