> /v1/alternatives/codex
Open source alternatives to Codex[010]
Codex is OpenAI's coding agent, running in a terminal, IDE or cloud sandbox to read a repository, write code and open pull requests. Below are 10 self-hostable open source alternatives, ranked by GitHub popularity.
opencode
Open source terminal coding agent that works with any LLM provider, from the SST team.
★ STARS
190.0k
⑂ FORKS
24.1k
Zed
Code at the speed of thought – Zed is a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.
★ STARS
82.2k
⑂ FORKS
8.3k
OpenHands
AI-Driven Development
★ STARS
72.9k
⑂ FORKS
9.2k
Cline
Autonomous coding agent right in your IDE, capable of creating/editing files, executing commands, using the browser, and more with your permission every step of the way.
★ STARS
61.5k
⑂ FORKS
6.4k
Aider
Aider is AI pair programming in your terminal
★ STARS
44.5k
⑂ FORKS
4.4k
Tabby
Self-hosted AI coding assistant
★ STARS
33.5k
⑂ FORKS
1.7k
kilocode
Kilo is the all-in-one agentic engineering platform. Build, ship, and iterate faster with the most popular open source coding agent.
★ STARS
19.0k
⑂ FORKS
2.5k
t3-code
Advanced AI coding assistant that enhances development workflow with intelligent code suggestions, automated debugging, and seamless integration.
★ STARS
11.1k
⑂ FORKS
2.1k
Emdash
Emdash is the Open-Source Agentic Development Environment ( YC W26). Run multiple coding agents in parallel. Use any provider.
★ STARS
4.3k
⑂ FORKS
413
OmoiOS
Spec-driven multi-agent orchestration — autonomous development workforce powered by Claude & OpenHands
★ STARS
62
⑂ FORKS
4
// EDITOR'S TAKE
opencode is the closest terminal-native equivalent, with the same agentic loop and TUI but pointed at whichever model provider you choose rather than one vendor's. Aider is the more conservative option, using repo maps and tight Git integration to keep diffs small and reviewable, while OpenHands is what you want if the appeal of Codex is the sandboxed cloud agent that takes a task and comes back with a pull request.
// FREQUENTLY ASKED
What is the best open source Codex alternative?
opencode is the most popular open source Codex alternative by GitHub stars (190,000 stars). The other 9 options are ranked above.
Are these Codex alternatives self-hostable?
Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.
Are they free?
All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.
// PART OF THESE COLLECTIONS