Best Open Source Alternatives to OpenAI Codex

2 open-source tools that can replace OpenAI Codex. Compare tech stacks, licenses and stars below.

MIT

A 100-line Python AI agent that solves GitHub issues and CLI tasks, scoring >74% on SWE-bench verified.

8.1k·AI Agents·Open source

Alternative to

MCPNOASSERTION

Open-source workspace to build, share, and run AI agents that automate your work.

4.7k·AI Agents·Open source

Alternative to