MathCode

MathCode: A Frontier Mathematical Coding Agent

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Project Page: math-ai-org/mathcode

English | 中文

MathCode is a terminal AI coding assistant with a built-in math formalization engine. Give it a math problem in plain language and it will automatically convert it into a Lean 4 theorem and attempt a formal proof.

The main branch of math-ai-org/mathcode is a lightweight bootstrap checkout. You clone the repo, run bash setup.sh, and setup.sh downloads the matching mathcode binary from GitHub Releases when it is missing.

Quick Start

git clone https://github.com/math-ai-org/mathcode.git
cd mathcode
bash setup.sh
codex auth login
./run

What setup.sh does:

• downloads the matching mathcode-vX.Y.Z-<os>-<arch>.tar.gz asset from GitHub Releases when ./mathcode is missing
• verifies SHA256SUMS.txt when shasum or sha256sum is available
• creates .env from .env.example when needed
• installs the bundled AUTOLEAN Python environment
• bootstraps Lean locally when lean / lake are missing

Requirements

• macOS (arm64) or Linux (x86_64)
• Python 3.10+
• enough disk space for the bundle, Lean toolchain, and Mathlib caches
• codex CLI if you want the default backend and default math flow

Common Commands

./run -p "prove that the square of an even number is even"
echo "hello" | ./run -p
./run --help

Math outputs are written to LeanFormalizations/.

Backend Setup

Default setup: no .env edits are required.

codex auth login
./run

To use an Anthropic-compatible backend instead, set:

MATHCODE_USE_OPENAI=0

ANTHROPIC_API_KEY=sk-ant-...
ANTHROPIC_MODEL=claude-sonnet-4-5

If you also want the math tools to stop using codex exec, add:

AUTOLEAN_USE_CODEX=0

Shell-exported environment variables override .env.

FAQ

Q: ./run says the MathCode binary is not installed yet

Run:

bash setup.sh

Q: ./run fails with exec format error, Bad CPU type in executable, or a similar startup error

You probably downloaded the wrong binary for your platform. Re-run bash setup.sh, or download the correct release asset manually from GitHub Releases.

Q: Startup says Codex auth is missing

Run:

codex auth login

Q: Can I skip cloning and just download a release asset

Yes. You can download and extract the .tar.gz bundle from GitHub Releases directly. The bootstrap repo just makes bash setup.sh the default path.

Acknowledgments

The math formalization and proving pipeline in MathCode is based on the AUTOLEAN project.