GitHub announced that Claude Opus 4.8, Claude Opus 5 and GPT-5.6 Terra are scheduled for retirement in Copilot on November 16, with an exception for certain annual individual subscriptions.
The practical issue is pinned configurations. An assistant that uses automatic model selection may transition smoothly, while a workflow that hardcodes a retiring model can break at an inconvenient time.
GitHub lists suggested replacements and enterprise policy considerations in its notice. This is a Copilot-specific schedule, not a claim that those models disappear from every provider.
Search project configuration and documentation for the exact names. Change only workflows that actually depend on those Copilot model IDs, and run a small acceptance test after migration.
What to do: Search Copilot settings and project instructions for the listed retiring models; plan any necessary switch before November 16.