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

Affected components

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

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 Claude's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

Other services with incidents at the same time

Overlapping incidents aren't necessarily related.

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• Twilio: SMS Delivery Delays and Failures From a Subset of Twilio Phone Numbers to Multiple Networks in Multiple CountriesMinor · Jul 25, 2026, 14:17 UTC

How often does Claude have incidents?

Claude reported 85 incidents in the last 90 days, 32 of them major or critical. A typical incident lasted 1h 7m. See Claude's uptime and incident history