12.2k
Developer
The pioneering library allowing the embedding of a developer agent into your application, enhancing interactivity and automation.
🤖
AI👨💻
Development🛠️
Tools
4 Open Source Alternatives to OpenAI Codex
Looking for an open-source alternative to OpenAI Codex? Below are 4 community-built tools that offer similar functionality — all free, open source, and ready to use or self-host. Ranked by GitHub stars.
10.9k
Claude Engineer
Claude Engineer is an interactive command-line interface (CLI) that leverages the power of Anthropic's Claude-3.5-Sonnet model to assist with software development tasks. This framework enables Claude to generate and manage its own tools, continuously expanding its capabilities through conversation. Available both as a CLI and a modern web interface.
👨💻
Development🔁
API🛠️
Tools⌨️
CLI
7.3k
Kimi-K2
Kimi K2 is a series of large language models developed by the Moonshot AI team, designed for advanced natural language processing tasks.
🤖
AI🛠️
Tools👨💻
Development
711
Shotgun
A Spec Driven Development tool for writing codebase-aware specs that guide AI coding agents and prevent them from derailing. Enables automated, high-precision code generation and testing workflows with AI.
👨💻
Development🤖
AI🧪
Testing
Frequently asked questions
What are the best open-source alternatives to OpenAI Codex?
The top picks from this list are Developer, Claude Engineer, Kimi-K2 — all maintained, free to use, and self-hostable.
Are these alternatives to OpenAI Codex free?
Yes. Every tool listed here is open source and free to use. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Can I self-host an alternative to OpenAI Codex?
Most of the alternatives listed are self-hostable. Check each tool's page for hosting details, system requirements, and licensing terms.
Stay Updated!
Get notified about new tools and updates to existing ones.