#opus

Opus 4.6 fast is leaving GitHub Copilot on June 29, 2026. The sunset covers Copilot Chat, inline edits, ask and agent modes, and code completions, with Opus 4.8 fast listed as the replacement.

LocalLLaMA cared about this eval post because it mixed leaderboard data with lived coding-agent pain: Opus 4.7 scored well, but the author says it felt worse in real use.

The r/singularity thread did not just react to Opus 4.7 scoring 41.0% where Opus 4.6 scored 94.7%. The interesting part was the community trying to separate real capability loss from refusal behavior, routing, and benchmark interpretation.

Anthropic posted that Opus 3, after retirement interviews, will continue sharing its reflections via a Substack blog for at least the next three months. The update points to an ongoing public publishing format rather than a one-off model announcement.