The open-source ChatGPT Enterprise alternative with built-in search
Onyx searches across 40+ tools your team already uses, respects permissions out of the box, and runs anywhere: cloud, self-hosted, or air-gapped. No model lock-in, no cloud-only limitations.
Feature | Onyx | ChatGPT |
|---|---|---|
Open-source & self-hostable | Yes | No |
Integrated Company Knowledge | +33 more 40+ indexed enterprise connectors | ~5 indexed, rest MCP 1 |
Model-agnostic (100+ LLMs) | Yes | No |
Air-gapped deployment | Yes | Can only be deployed on OpenAI infrastructure |
Advanced RAG with knowledge graphs | Yes | Basic RAG |
1MCP connectors fetch data live at query time: slow, incomplete, and limited to what a single API call returns. Indexed connectors continuously sync your data in the background, enabling instant, comprehensive, permission-aware answers.
Head-to-Head Benchmark Results
Independent evaluation across 99 real-world workplace questions using 220K internal documents from Slack, Google Drive, GitHub, Gmail, and more.
Overall Win Rate
Onyx
ChatGPT
Fact Lookup
Onyx
ChatGPT
Based on 99 real-world workplace questions across 220K internal documents. Judged by GPT-5.2 and Claude Opus 4.5. Read the full benchmark
Pricing Comparison
Onyx
$20/user/month
ChatGPT Enterprise
~$60/user/month (Enterprise), $25/user/month (Business)
14-day free trial. No credit card required. No minimum seats. No minimum contract.
~150-seat minimum. Credits-based billing for advanced features. Annual commitment required.
Total Cost of Ownership
Estimated annual cost comparison based on per-user pricing.
Team size
100 users
10
1,000
Onyx
$24,000
$20/user/month
ChatGPT
$72,000
~$60/user/month
Annual Savings
$48,000
67% less with Onyx
Detailed Comparison
Click each section to expand the full comparison.
Onyx
Onyx was built from day one as an enterprise search platform. 40+ native connectors continuously crawl and index your data from Slack, Google Drive, Confluence, Jira, GitHub, Salesforce, and more. Permission syncing ensures users only see what they have access to in the source system. Hybrid search combines semantic and keyword retrieval with LLM-based knowledge graphs for best-in-class answer quality.
ChatGPT Enterprise
ChatGPT Enterprise launched "Company Knowledge" in October 2025. It supports ~15 apps including Google Drive, SharePoint, Slack, Notion, and GitHub. "Synced connectors" pre-index content while "chat connectors" query on-demand. Permission-aware retrieval is available but inherits oversharing risks from source systems; if your Google Drive permissions are too broad, ChatGPT will surface that data to anyone.
Which is Right for You?
Onyx is best for
Teams that need AI answers grounded in company data across 40+ tools
Organizations requiring self-hosted, on-premise, or air-gapped deployment
Companies wanting model flexibility. Use any LLM, switch freely
Security-conscious teams that want open-source code transparency
Cost-conscious organizations. Onyx is $20/user/month for cloud or available self-hosted with a paid license
ChatGPT Enterprise is best for
Organizations wanting best-in-class GPT model quality for general-purpose AI tasks
Teams that primarily need AI for writing, coding assistance, and data analysis. They don't need a best in class enterprise search solution.
Companies comfortable with cloud-only deployment and OpenAI model lock-in
Non-technical users who value ChatGPT's familiar, intuitive interface
Frequently Asked Questions
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