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 Mobile iOS and Android
  • GitHub Copilot 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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