Allison announces the deprecation of the GPT-4o model in Copilot Chat, outlining the move to GPT-4.1 as the new standard and explaining the impacts for developers using Copilot.

Deprecation of GPT-4o in Copilot Chat

As of August 6, 2025, GitHub Copilot Chat no longer supports the GPT-4o model. Users of Copilot Chat (including ask, edit, and agent modes) in supported IDEs, on github.com/copilot, and within GitHub mobile apps are now directed to use the newer GPT-4.1 model.

What’s Changing?

GPT-4o is Deprecated: The GPT-4o model is now removed for use in Copilot Chat features.
GPT-4.1 is the New Default: Transition to GPT-4.1 is encouraged, offering improved performance and abilities over GPT-4o, especially in conversational AI tasks.
Scope: This deprecation only affects Copilot Chat (across IDEs, web, and mobile). Standard code completions in Copilot still currently rely on GPT-4o.

Additional Information

Changelog (May 8th Announcement)
Changelog (March 27th, GPT-4o for code completions)
Join discussions and ask questions in the GitHub Community.

What Should You Do?

Ensure Copilot Chat instances are upgraded to the newest model (GPT-4.1).
Review documentation or changelogs if you notice differences in responses or behavior in Copilot Chat.

Impact

The update reflects GitHub’s ongoing platform improvements, helping developers access the latest AI modeling capabilities within Copilot Chat.

For more details, see the official changelog post.

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