Open-source alternatives to OpenAI Codex

AI Agents · 2 free & open-source options

Looking to replace OpenAI Codex with something free and open-source? These 2 tools are the best open alternatives in 2026 — most are self-hostable, so you keep full control of your data and pay no subscription.

At a glance: how they compare

Click a column to sort — the best one depends on what matters to you.

Which one should you pick?

Open Codex Computer Use

Open computer-use agent that drives real desktops and browsers. Its MIT license is permissive — free to use commercially, embed and modify. Because it is self-hostable, your data can stay entirely on your own infrastructure.

OpenSail

Agent workspace that replaces the hosted app with your own stack. Its Apache-2.0 license is permissive — free to use commercially, embed and modify. Because it is self-hostable, your data can stay entirely on your own infrastructure.

Switching from OpenAI Codex without the drama

1. Export your data from OpenAI Codex first — most tools above can import standard formats.
2. Run your top pick in parallel for a week or two before committing; self-hosted options can be tried locally in minutes.
3. Migrate one team or one project at a time, keeping the old account read-only until everything checks out.

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