GitHub Copilot retires Claude Opus 4.8, Opus 5 and GPT-5.6 Terra on Nov 16

GitHub will remove Claude Opus 4.8, Claude Opus 5 and GPT-5.6 Terra from all Copilot surfaces on November 16, 2026, including chat, inline edits, ask and agent modes, and code completions. Replacements are Claude Opus 5.5 and GPT-6.1 Sol or GPT-6 Luna; Opus 4.8 stays only for individual annual subscribers.

• Retirement covers chat, inline edits, agent mode and code completions
• Replacements: Claude Opus 5.5 for Opus, GPT-6.1 Sol or GPT-6 Luna for Terra
• Opus 4.8 remains only for individual subscribers on annual plans
• Admins must confirm the new models are enabled in org model policies