Open source alternatives to Codex

By GitHub stars it is Pi, with 121,872 stars and a commit on 13 Nov. Choose Pi when you want to reshape the agent itself with TypeScript extensions for commands, tools or plan mode, on any model provider. Next come goose (56,560 stars) and Qwen Code (30,120 stars).

Yes. The code of all 3 is public under MIT or Apache 2.0, so you can use them with no licence fee. Running one yourself costs the server and your time to look after it, and some makers also sell a hosted plan.

Start from the job you use Codex for. Choose goose when you want one agent for code and everyday tasks that is not tied to a ChatGPT plan. Choose Qwen Code when you want to hand coding tasks to an agent from Telegram, WeChat or DingTalk, on whichever model provider you pick.

All 3: Pi, goose and Qwen Code. Each tool's page says what it needs to run.

All 3 we track had a commit in the last 30 days, among them Pi, goose and Qwen Code. A recent commit shows the project is kept up, not that it will stay that way.

Apache 2.0 (2), MIT (1). MIT, BSD and Apache let you change and reuse the code freely.

The hosting. Codex's maker runs the servers for you; with an open source tool the updates, backups, security fixes and support are yours, unless you take the maker's hosted plan. Features differ too, so check what each one imports and exports before you move your data.