GitHub has deprecated several AI models in Copilot as of October 23, 2025, including Claude Sonnet 3.7, Claude Opus 4, GPT o3/o1/o3/o4 mini variants, and Gemini 2.0 Flash. Users should migrate to newer alternatives like Claude Sonnet 4.5, Claude Opus 4.1, GPT-5 variants, and Gemini 2.5 Pro. Enterprise administrators may need to enable access to replacement models through Copilot settings, while deprecated models will be automatically removed without user action.
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