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GitHub retires Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5 across most Copilot experiences on October 19; workflows must switch to supported models.

GitHub’s dated October 19, 2026 model-deprecation table, listing six retired Copilot models and their suggested replacements.

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GitHub Changelog ↗ · Source dated

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