Allison announces the deprecation of Claude Sonnet 3.5 in GitHub Copilot, with Claude Haiku 4.5 now available for Copilot Free. The update covers new model access, steps for administrators, and links to further information.

Claude Sonnet 3.5 Deprecated—Claude Haiku 4.5 Now Available in Copilot Free

As of November 10th, 2025, GitHub Copilot has deprecated the Claude Sonnet 3.5 model across all Copilot experiences—including Copilot Chat, inline edits, ask and agent modes, and code completions. In its place, Copilot Free users can now access Claude Haiku 4.5, an improved AI model from Anthropic that offers enhanced coding capabilities at no cost.

Model	Deprecation date	Suggested alternative
Claude Sonnet 3.5	2025-11-10	Claude Sonnet 4.5 (paid), Claude Haiku 4.5 (Copilot Free)

What to do next:

Update workflows and integrations to use the supported models.
Copilot Enterprise administrators may need to enable access to alternative models through their Copilot settings’ model policy features.
- To confirm availability, check your individual Copilot settings and verify that the policy for the new model is enabled.
- Once enabled, the new model will appear in the Copilot Chat model selector in Visual Studio Code and on github.com.
No action is required to remove deprecated models; they are no longer available by default.

Further Resources:

Learn more about supported models in Copilot: GitHub documentation on models
Join the GitHub Community to share your feedback or ask questions.

GitHub Enterprise customers with questions are encouraged to contact their account manager for further assistance.

This post appeared first on “The GitHub Blog”. Read the entire article here