Major impactResolvedAI/ML

Anthropic outage: Elevated errors for Mythos 5, Fable 5, Opus 5 and Claude Haiku 4.5

Anthropic reported this major-impact incident on its official status page on Jul 25, 2026, 18:40 UTC. It was resolved after 1h 4m.

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Jul 25, 2026, 18:40 UTC
started
Jul 25, 2026, 19:44 UTC
resolved
1h 4m
duration
Major
impact

Affected components

  • Claude API (api.anthropic.com)
  • Claude Code
  • Claude Cowork
  • claude.ai

Timeline

updates from Anthropic's status page ↗
  1. resolvedJul 25, 2026, 19:44 UTC

    This incident has been resolved.

  2. identifiedJul 25, 2026, 18:44 UTC

    The issue has been identified and a fix is being implemented.

  3. investigatingJul 25, 2026, 18:40 UTC

    We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Haiku 4.5. We will provide an update as soon as possible.

What APIStatus.watch saw

Our 5-minute checks didn't record a change in Anthropic's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

How often does Anthropic have incidents?

Anthropic reported 47 incidents in the last 90 days, 21 of them major or critical. A typical incident lasted 1h 4m. See Anthropic's uptime and incident history

Next: Elevated errors for Claude Fable 5, Claude Sonnet 5, Claude Haiku 4.5, and other models (Jul 25, 2026) →
Anthropic outage on Jul 25, 2026: Elevated errors for Mythos 5, Fable 5, Opus 5 and Claude Haiku 4.5 · APIStatus.watch