Allison explains the public preview of Claude Sonnet 4.5 in GitHub Copilot, detailing model access across Copilot Chat and CLI for Pro, Business, and Enterprise users, with steps for enabling and using the new AI model.

Anthropic Claude Sonnet 4.5 Launches for GitHub Copilot Chat and CLI

Anthropic’s Claude Sonnet 4.5 is now rolling out in GitHub Copilot for Copilot Pro, Pro+, Business, and Enterprise users. This release brings significant enhancements to coding and real-world agent workflows, thanks to the model’s improved tool orchestration, advanced context editing, and domain-specific intelligence.

Availability in GitHub Copilot

Copilot Chat

  • Claude Sonnet 4.5 can be selected in the Copilot Chat model picker.
  • Supported across Visual Studio Code (chat, ask, edit, agent mode), github.com, and GitHub Mobile (iOS, Android).

Copilot CLI

  • Users on Pro, Pro+, Business, and Enterprise plans can access Claude Sonnet 4.5 in the Copilot CLI (v0.0.329 and above).
  • To update, run npm install -g @github/copilot and use the /model command to switch.

Enabling Access

  • Rollout is gradual. Not all users may see the model immediately.
  • Enterprise and Business plan admins must enable the Claude Sonnet 4.5 policy in Copilot settings for users to access the model in both Chat and CLI.
  • Copilot Free, Pro, and Pro+ users may bring their own Anthropic API key in VS Code by managing models and entering their key when prompted.

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