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Resolved Anthropic (Claude) · degraded service

Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1

Posted 15 Sep 09:48 UTC, last seen today 14:09 UTC.

Anthropic (Claude) status pageOn the status board
Unknown Duration: the provider stated no start
4Updates posted
4Other incidents at the same time

What it affected

As the provider names it

claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork

What the provider posted

Newest first
  1. 15 Sep 11:14 UTCResolvedA fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.
  2. 15 Sep 10:50 UTCMonitoringA fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.
  3. 15 Sep 09:52 UTCUpdateWe are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.
  4. 15 Sep 09:48 UTCInvestigatingWe are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.

Around it

From the sources ChangeIntel reads; a match in time is not a cause

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

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Sources read 14 Oct 13:56 UTC · 254 of 255 readable · 253 fully read · documentation 0/409 current

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