Anthropic reports degraded performance for Claude Opus 5 and Sonnet 5

Sources: Anthropic status incident
Summary: Anthropic opened the incident at 13:56 UTC on 2026-08-17 for elevated errors on requests to Claude Opus 5. It reported at 14:25 UTC that Opus 5 was operational while Sonnet 5 remained degraded, implemented a fix at 14:39 UTC, and resolved the incident at 15:29 UTC. No root cause was published.
Why it matters: The window overlapped the GitHub incident, so teams running coding agents against both saw two upstream dependencies degrade at once.