lean-dojo/LeanCopilot

Health v2 · maintenance only

Adoption not part of the score

1316 stars · 127 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Lean Copilot integrates large language models natively into the Lean 4 theorem prover for proof automation. It provides tactic suggestion, premise selection, and proof search using built-in models from LeanDojo or user-supplied models running locally or in the cloud.

Use cases

• suggest tactics for a Lean proof I'm stuck on
• search for complete proofs automatically in Lean 4
• find relevant theorems and lemmas to use as premises
• run an LLM copilot inside my Lean project
• bring my own model for theorem proving assistance
• accelerate formalizing mathematics in Lean

When to choose

• you write proofs in Lean 4 and want AI-assisted tactic suggestions or proof search
• you want to plug custom local or cloud-hosted LLMs into Lean
• you work on formal mathematics and want premise retrieval from Mathlib-style libraries

When to avoid

• you need a general-purpose code completion copilot outside of Lean
• your project targets Lean 3 or versions below lean4:v4.3.0-rc2
• you cannot install native dependencies like CTranslate2 or lack supported platform support

Facets

library · maturity active

llm-inference machine-learning plugin-system sdk artificial-intelligence large-language-models mathematics developer-tools education windows cpp python lean4 theorem-proving formal-mathematics tactic-suggestion proof-search premise-selection ctranslate2 human-ai-collaboration linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="lean-dojo/LeanCopilot")