Claude Reports Elevated Errors for Multiple Models

Claude is reporting an active service incident on its official status page.

Technobezz

Editorial Team

Updated September 21, 2026Sep 21, 2026

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5 min read

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Updated 9:17 p.m. Eastern on September 21, 2026

Claude says elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 have been identified, and work on a fix is underway.

What is affected

The incident affects requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5, with claude.ai, Claude API, Claude Code, and Claude Cowork listed as affected components.

Official update timeline

8:57 p.m. Eastern on September 21, 2026, marked Investigating

We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5. We will provide an update as soon as possible.

9:17 p.m. Eastern on September 21, 2026, marked Identified

We have identified the cause of elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and are working on a fix. We will provide an update as soon as possible.

Read the official Claude status page.

Track Claude in the Technobezz status catalog.