From the source

Selected models in GitHub Copilot deprecated

GitHub Copilot deprecates several models across all experiences.

GitHub deprecated several models across all Copilot experiences, including Copilot Chat, inline edits, ask and agent modes, and code completions, effective October 2, 2026.

Users are advised to update workflows to supported models, and Enterprise administrators may need to enable alternative models through settings.

From the source
As of today, October 2, 2026, we have deprecated the following models across all GitHub Copilot experiences (including Copilot Chat, inline edits, ask and agent modes, and code completions).
github.blog

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