AI tool comparison
ChatGPT vs Onyx
Which one should you ship with? Here is the side-by-side panel verdict, pricing read, reviewer split, and community vote comparison.
AI Assistants
ChatGPT
OpenAI's flagship AI assistant — multimodal, reasoning, and now video
100%
Panel ship
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Community
Free
Entry
ChatGPT is the world's most-used AI assistant with 400M+ users. GPT-4o delivers native multimodal capabilities across text, images, audio, and video in a single model. o1 and o3 reasoning models tackle complex math and code. Features include Projects for persistent context, memory that improves over time, Canvas for collaborative document editing, voice mode, and Sora for text-to-video generation. The broadest feature surface of any AI assistant.
AI Assistants
Onyx
Open-source AI chat with enterprise RAG that runs anywhere
75%
Panel ship
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Community
Free
Entry
Onyx is a fully open-source AI platform that brings together chat, agentic RAG, deep research, and custom agents in a single self-hostable application. Unlike cloud-only alternatives, Onyx runs on Docker, Kubernetes, or any major cloud provider, giving teams complete control over their data and deployment. The platform connects to 50+ data sources via indexing connectors and supports every major LLM provider — from self-hosted Ollama models to OpenAI and Anthropic. Its hybrid search combines keyword and vector indexing, while multi-step research agents ranked top on their benchmark as of February 2026. Onyx ships in two editions: a Community Edition (MIT-licensed) covering chat, RAG, agents, and actions, and an Enterprise Edition adding SSO, RBAC, audit logs, and whitelabeling. With nearly 24k GitHub stars and 4k new this week, it's become the de facto open-source alternative to tools like Glean and Guru.
Reviewer scorecard
“GPT-4o's multimodal API is production-ready and covers text, vision, audio, and code in one endpoint. o3 is now my go-to for hard algorithmic problems. The breadth of the platform — Projects, memory, custom GPTs — means there's always a right tool in this toolbox.”
“If you've been paying for Glean or Guru, Onyx is your escape hatch. Self-hosting is straightforward with Docker, and the 50+ connectors cover virtually every data source your team needs. The hybrid search quality is genuinely competitive.”
“Too many model tiers (o1, o3, GPT-4o, GPT-4o-mini, GPT-4.5) creates confusion. But the platform keeps shipping and the quality is undeniable. Claude still edges it on reasoning depth, but for everything else, ChatGPT is the safe default.”
“Self-hosting a full AI platform isn't actually free — you're paying in ops overhead, GPU costs, and the engineer-hours to maintain it. The enterprise features that actually matter (SSO, RBAC) are paywalled behind a license that isn't priced publicly, which is a red flag for budget planning.”
“Canvas transformed my writing workflow — real-time co-editing, tone controls, and length adjustment without reprompting. Sora for quick video concepts is a creative shortcut I use weekly. Voice mode on walks is genuinely useful for ideation.”
“For content teams that need AI over their own knowledge base without shipping documents to a third-party cloud, Onyx is a genuine solution. The voice mode and image generation are unexpected bonuses that make it a complete workspace.”
“The memory feature compounds — the longer you use it, the more personalized it becomes. Projects make ChatGPT a persistent collaborator, not a stateless chat window. OpenAI is building the ambient AI layer and ChatGPT is the front door.”
“Onyx represents a critical counter-movement to AI centralization. As enterprise AI spending scrutiny intensifies, self-hostable alternatives with full data sovereignty will capture the compliance-sensitive markets that hyperscalers are locked out of.”
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