Upcoming deprecation of Opus 4.6 (fast) in Copilot

What's new

• Opus 4.6 (fast) sunset: a breaking deprecation notice for users pinning this model in Copilot.
• Migration: recommended move to current-gen Opus (4.7/4.8) or to MAI-Code-1-Flash for fast tasks.

Why it matters

A small but breaking change — teams pinning 'Opus 4.6 fast' in Copilot Chat or IDE config must switch before the sunset date or have their default moved for them. Reflects the push to unify the model line-up (Opus 4.7/4.8 are newer generations + Microsoft is pushing its own MAI-Code-1-Flash as the default-fast).

How to try

Check the default model in Copilot Chat / IDE settings and switch to the current generation ahead of the sunset date.