GitHub Copilot Deprecates Gemini 3.1 Pro, Claude Opus/Sonnet 4.5/4.6, and Raptor Mini

As of September 1, 2026, GitHub Copilot deprecated Gemini 3.1 Pro, Claude Opus 4.5/4.6, Claude Sonnet 4.5/4.6, and Raptor Mini across chat, inline edits, and code completion, pointing users to newer replacement models.