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
There are 4 open-source alternatives to OpenAI Codex in this directory. The most popular is Developer with 12.2k GitHub stars, followed by Claude Engineer(10.9k stars). All are open source, free to use, and many can be self-hosted.
Quick comparison
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Developer The pioneering library allowing the embedding of a developer agent into your application, enhancing interactivity and automation. | 12.2k | Python | MIT License |
| 2 | 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. | 10.9k | Python | — |
| 3 | Kimi-K2 Kimi K2 is a series of large language models developed by the Moonshot AI team, designed for advanced natural language processing tasks. | 7.3k | — | Other |
| 4 | 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. | 711 | Python | MIT License |
All open-source alternatives to OpenAI Codex
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 three are Developer(12.2k stars), Claude Engineer(10.9k stars), Kimi-K2(7.3k stars). All are open source and free to use.
Are these alternatives to OpenAI Codex free?
Yes. Every tool listed here is open source and free to use in your own projects. 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?
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
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