Onyx

Onyx is an open source application layer for LLMs that teams self-host as a full chat workspace. The interface supports agentic retrieval-augmented generation over connected knowledge, multi-step deep research, custom agents with their own instructions and knowledge, and web search through providers such as Serper, Google PSE, Brave, and SearXNG, plus sandboxed code execution, document generation, and a voice mode. More than 50 indexing connectors ingest sources out of the box, with additional integrations available through the Model Context Protocol. It connects to most LLM backends, from self-hosted Ollama, vLLM, and LiteLLM to OpenAI, Anthropic, and Gemini. Deployments range from Onyx Lite, a lightweight chat and agents build that runs in under 1 GB of memory, to the full stack with vector and keyword indexing, background workers, Redis, and MinIO, installable via Docker, Kubernetes, Helm, or Terraform. The Community Edition is MIT licensed, and an Enterprise Edition serves larger organizations.