minorArchivedAnthropicv5.1

Anthropic: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Investigating(done)
Trending(skipped)
Workaround available(skipped)
Resolved(done)
Archived

Executive summary

Elevated error rates have been observed on requests to Claude Mythos 5.1 and Claude Fable 5.1, which are affected by a known issue that is currently being addressed with a fix.

No verified workaround yet

This incident was resolved upstream without a reported workaround.

Official fix

Technical root cause

Known issue in the software causing elevated error rates

Evidence

1 report · 1 StatusShow

[1]
Status First report2 months ago
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1(opens official status page in a new tab)
Investigating: We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1. We will provide an update as soon as possible. Identified: We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible. Monitoring: A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery. Update: A fix has been deployed for the…
by anthropic status

Timeline

First report on status pageSep 11, 14:37 UTC
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
Source
Official statementSep 11, 14:37 UTC
Investigating: We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1.
Source
Status changedSep 11, 14:37 UTC
Status changed: new → archived (resolved more than 14 days ago).