Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5
View the provider incident record →Current answer
Anthropic (Claude) experienced a critical incident: Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5. ServiceAlert observed recovery on Oct 24, 2026.
Official Anthropic (Claude) status page Current Anthropic (Claude) status
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Incident Lifecycle
Affected Components
claude.ai
Claude API (api.anthropic.com)
Claude Code
Claude Cowork
Incident Timeline
Monitoring
We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.
Oct 23, 2026 at 11:54 PM UTC
Identified
We have identified the cause of elevated errors on requests to Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5, as well as fast mode requests to Opus 5.5 and are working on a fix. We will provide an update as soon as possible.
Oct 23, 2026 at 11:39 PM UTC
Investigating
We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.
Oct 23, 2026 at 11:37 PM UTC
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