GitHub has deprecated Grok Code Fast 1 across all GitHub Copilot experiences effective May 15, 2026. This affects Copilot Chat, inline edits, ask and agent modes, and code completions. Users are advised to migrate to GPT-5 mini or Claude Haiku 4.5 as alternatives. Copilot Enterprise administrators may need to enable access to alternative models through their model policies in Copilot settings.
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