Outage in Claude
Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5
Resolved MajorIncident Report
Summary AI Generated
**Incident Summary** On August 13, 2026, Claude experienced elevated errors across three models — Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5 — affecting both claude.ai and api.anthropic.com. The incident lasted approximately 1.6 hours, during which users encountered failed or degraded requests to these models. The issue was fully resolved by 16:08 UTC.
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5. We will provide an update as soon as possible.
Components affected
Claude claude.ai Claude api.anthropic.comLatest Updates ( sorted recent to last )
RESOLVED
7 days ago - at 08/13/2026 04:08PM
The issue affecting Claude Mythos 5 and Claude Fable 5 has been resolved.
INVESTIGATING
7 days ago - at 08/13/2026 03:44PM
We are investigating elevated errors on requests to Claude Mythos 5 and Claude Fable 5. We will provide an update as soon as possible.
INVESTIGATING
7 days ago - at 08/13/2026 02:33PM
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5. We will provide an update as soon as possible.
Latest Claude outages
Degraded performance for Claude Opus 5 and Claude Haiku 4.5 - about 19 hours ago
Degraded performance for multiple models - 1 day ago
Service disruption on Claude services - 3 days ago
Service disruption on Claude services - 3 days ago
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