Copilot retires three model offerings on 16 November. Check the annual-plan exception.
GitHub schedules Claude Opus 4.8, Claude Opus 5 and GPT-5.6 Terra for removal across Copilot experiences on 16 November 2026. Individual annual-plan subscribers retain Opus 4.8. The suggested replacements are Opus 5.5, and GPT-6.1 Sol or GPT-6 Luna for Terra. 1
Business and Enterprise administrators who disabled default model enablement must explicitly allow the replacements. GitHub will remove deprecated choices; that does not validate the tasks or integrations that relied on them. 1
Inventory the actual model selections in saved workflows and team instructions. Run acceptance cases on the intended replacements, including a task with tool use and a failure path, then record the rollout owner. This notice concerns Copilot availability; other providers have their own retirement schedules.
Move affected Copilot workflows before 16 November; check annual-plan eligibility separately.