Best ChatGPT Enterprise Alternative (2026) | Onyx vs ChatGPT Enterprise
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: 64%
- ChatGPT: 36%
Fact Lookup
- Onyx: 78.5%
- ChatGPT: 21.5%
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 the 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 | Onyx | ChatGPT |
|---|---|---|
| 100 users | $24,000 | $72,000 |
| 10 | $20/user/month | ~$60/user/month |
| 1,000 |
Annual Savings
$48,000
67% less with Onyx.
Detailed Comparison
Click each section to expand the full comparison.
Enterprise Search & Connectors
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.
AI Model Flexibility
Deployment & Data Sovereignty
Custom Agents & Actions
Security & Compliance
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.
Frequently Asked Questions
- Does ChatGPT Enterprise have enterprise search like Onyx?
- Can I self-host ChatGPT Enterprise?
- How does Onyx compare to ChatGPT Enterprise on answer quality?
- Can Onyx use OpenAI models like ChatGPT does?
- Is Onyx's open-source model secure enough for enterprise use?
Get Started
Start your 14-day free trial of Onyx (no credit card required).
Secure enterprise-grade security and compliance. Flexible and secure deployment options.
Open-Source deep customizability optimized for your use case, supported by a large Open-Source community.