minorArchivedAnthropic

Anthropic: Elevated errors for multiple models

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

Executive summary

Multiple Claude models (Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6) are experiencing elevated error rates and are currently being investigated by OpenAI.

No verified workaround yet

This incident was resolved upstream without a reported workaround.

Official fix

Technical root cause

The issue is related to a problem with the models' requests, which has been identified but requires further investigation for a definitive cause.

Evidence

1 report · 1 StatusShow

[1]
Status First report2 months ago
Elevated errors for multiple models(opens official status page in a new tab)
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. 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. Update: An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6. Update: We are…
by anthropic status

Timeline

First report on status pageSep 3, 16:23 UTC
Elevated errors for multiple models
Source
Official statementSep 3, 16:23 UTC
Investigating: We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5.
Source
Status changedSep 3, 16:23 UTC
Status changed: new → archived (resolved more than 14 days ago).