minorArchivedAnthropicv5.1

Anthropic: Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1

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

Executive summary

Intermittent error spikes have been observed for requests to Claude Mythos 5.1 and Claude Fable 5.1, affecting all users. A fix has been deployed and is currently being monitored.

No verified workaround yet

This incident was resolved upstream without a reported workaround.

Official fix

Technical root cause

Under active investigation. No report has identified a root cause yet.

Evidence

1 report · 1 StatusShow

[1]
Status First report2 months ago
Intermittent error spikes 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 Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible. Update: We 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. Monitoring: A 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. Resolved: A fix has been deployed for Claude Mythos 5.1 and…
by anthropic status

Timeline

First report on status pageSep 15, 11:14 UTC
Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
Source
Official statementSep 15, 11:14 UTC
Investigating: We are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1.
Source
Status changedSep 15, 11:14 UTC
Status changed: new → archived (resolved more than 14 days ago).