What is psi?
psi is an open source coding agent that runs in the terminal. It has a small C core with a Lua runtime, ships as a 6.4 MB portable binary, and works with Anthropic, OpenAI Codex, OpenRouter or local Ollama models.
Key facts
- Pricing
- Free
- Free plan
- Yes
- Category
- Coding
- Website
- https://psicode.ai/
- Listing updated
- Nov 11, 2026
psi FAQ
What is psi?
psi is an open source coding agent that runs in the terminal. It has a small C core with a Lua runtime, ships as a 6.4 MB portable binary, and works with Anthropic, OpenAI Codex, OpenRouter or local Ollama models.
Is psi free?
Yes. psi lists a free plan. Pricing: Free.
What are alternatives to psi?
Coding alternatives to psi include GitHub Copilot, Together AI, Baseten, Straion, Cursor and Pinecone.