GPT-5.3-Codex is now generally available for GitHub Copilot
Source: GitHub Changelog
GPT-5.3-Codex, OpenAI’s latest agentic coding model, is now rolling out in GitHub Copilot. In early testing, GPT-5.3-Codex reaches new high scores on benchmarks we use to evaluate coding, agentic, and real‑world capabilities. It also has improved reasoning and execution in complex, tool‑driven, long‑running workflows which help it to deliver up to 25 % faster performance than GPT‑5.2‑Codex on agentic coding tasks.
Availability in GitHub Copilot
GPT-5.3-Codex will be available to Copilot Pro, Pro+, Business, and Enterprise users.
You’ll be able to select the model in the model picker in:
- Visual Studio Code in all modes: chat, ask, edit, agent
- github.com
- GitHub Mobile (iOS and Android)
- GitHub CLI
- GitHub Copilot Coding Agent
Rollout will be gradual. Check back soon if you don’t see it yet.
Enabling access
Copilot Enterprise and Copilot Business plan administrators must enable the GPT-5.3-Codex policy in Copilot settings.
Learn more
To explore all models available in GitHub Copilot, see our documentation on available models and get started with Copilot.
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