The open-source ChatGPT Enterprise alternative
Onyx searches across 40+ tools, respects permissions out of the box, and runs anywhere. No model lock-in, no cloud-only limitations.
Feature | Onyx | ChatGPT |
|---|---|---|
Flexible deployment | Cloud, hosted in your cloud, or fully on-prem | Cloud only |
Integrated company knowledge | +33 more 40+ indexed enterprise connectors | ~10 indexed, rest MCP 1 |
Model-agnostic (100+ LLMs) | Yes | No |
Advanced agent creation | Attach any connected knowledge, MCP + OpenAPI actions | OpenAPI actions only |
Deep research | Yes | Yes |
Projects | Yes | Yes |
Image generation | Any model (Nanobanana, GPT Image, more) | OpenAI models only |
Open-source | Yes | No |
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.
More Accurate Answers
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)
Try Business edition on our Cloud ($20/user/month). 14-day free trial. No credit card required.
Enterprise edition adds SLAs, dedicated support, and white-labeling.
~150-seat minimum for Enterprise. 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 for best-in-class answer quality.
ChatGPT Enterprise
ChatGPT Enterprise launched "Company Knowledge" in October 2025. It supports ~10 synced (indexed) apps and additional on-demand apps including Google Drive, SharePoint, Slack, Notion, and GitHub. Synced apps pre-index content while other apps 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
Security-conscious teams requiring self-hosted, on-premise, or air-gapped deployment
Companies wanting model flexibility. Use any LLM, switch freely
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
When we work in a sensitive defense space, we prioritize suppliers that are big, established companies with a lot of reputation at stake, or services that we can self-deploy so that we control where the data goes.
Helsing
Frequently Asked Questions
Get Started
Today
Start your 14-day free trial of Onyx (no credit card required)
Secure
Enterprise-grade security and compliance. Flexible and secure deployment options.
Trusted by
top teams