Opus 5.5 shipped at 16:31 UTC. Within 15 hours, we had receipts on whether three agent skills still help.
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Anthropic released Claude Opus 5.5 at 16:31 UTC on 22 September. By 07:08 UTC the next morning, Driftproof had six sealed receipts answering the question every skill author has on a release day: does my skill still help on the new model? What we ran Three public skills from addyosmani/agent-skills…
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- 2026-09-24 19:45 · DEV Community — AI
Opus 5.5 shipped at 16:31 UTC. Within 15 hours, we had receipts on whether three agent skills still help.