Codex CLI
OpenAI's own agent. Vendor-locked to OpenAI models; no bring-your-own-key across providers.
| GitHub stars | 126K (updated September 2026) |
|---|---|
| Language | Rust |
| License | Apache-2.0 |
| Bring your own key | No |
| Pricing | OpenAI subscription or API billing; OpenAI models only |
| Footprint | n/a |
| Sandbox | n/a |
Repository: openai/codex