Overview

Jan is an open-source replacement for ChatGPT:

• AI Models: Use AI models with agentic capabilities
  • Open-source Models: Run open-source locally
  • Cloud Models: Connect to remote models with API keys
• Assistants: Create custom AI assistants
• MCP Servers: Integrate MCP Servers to give agentic capabilities to AI models
• Jan Hub: Browse, install, and manage models
• Local API Server: Expose an OpenAI-compatible API from your own machine or server

Product Suite

Jan is a full product suite (opens in a new tab) that offers an alternative to Big AI:

• Jan Desktop: macOS, Windows, and Linux apps with offline mode
• Jan Web (opens in a new tab): Jan on browser, a direct alternative to chatgpt.com
• Jan Mobile: iOS and Android apps (Coming Soon)
• Jan Server: deploy locally, in your cloud, or on-prem
• Jan Models: Open-source models optimized for deep research, tool use, and reasoning

Extending Jan (Coming Soon)

Jan helps you customize and align Open Superintelligence:

• Jan Connectors: Extend Jan with integrations
• Jan Studio: Fine-tune, align, and guardrail
• Evals: Benchmark models across industries, regions, and alignment dimensions

Principles

• Open source (opens in a new tab): Apache 2.0 (opens in a new tab) licensed, built in public.
• No vendor lock-in (opens in a new tab): Switch freely between local and frontier models.
• Right to Repair (opens in a new tab): Inspect, audit, and modify your AI stack.

Jan grows through contribution. It is shaped by many and belongs to everyone who uses it.

Acknowledgements

Good artists copy, great artists steal.

Jan exists because we've borrowed, learned, and built on the work of others.

• llama.cpp (opens in a new tab) and GGML (opens in a new tab) for efficient inference
• r/LocalLLaMA (opens in a new tab) for ideas, feedback, and debate
• Model Context Protocol (opens in a new tab) for MCP integrations
• PostHog (opens in a new tab) for docs inspiration
• The open-source community for contributions, bug reports, and improvements