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Claude Degraded Performance for Multiple Models Resolved

What happened

On August 18, 2026, Claude experienced degraded performance for multiple models. Hacker News reported the status page indicating degraded performance. Anthropic Status investigated elevated errors on requests to Claude Opus 5, Claude Mythos 5, Claude Fable 5, and other models. A fix was implemented and monitored, and the issue was resolved at 19:01 UTC. Impact occurred from 16:11 to 18:23 UTC.

Summary written by AI strictly from the sources below

Why it's spreading

  • ConfirmedAnthropic Status published a first-party announcement
  • Confirmed2 sources are covering it, Hacker News first

Timeline

  1. Reported degraded performance for multiple models on Claude status pageHacker News
  2. Reported investigation, fix implementation, monitoring, and resolution of degradAnthropic Status

Sources