Elevated errors for multiple models
The issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.
The latest update from Anthropic.
State
Resolved
Started
59 d ago
2026-09-03 13:26 UTC
Lasted
2 h 57 min
until 2026-09-03 16:23 UTC
Worst impact
Partial outage
Timeline
7 updatesInvestigating
15 min 9%
Identified
2 h 25 min 82%
Monitoring
16 min 9%
Updates
Times in UTCAs posted by Anthropic
The issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.
A fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.
The only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.
We are continuing to work on a fix for this issue.
An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.
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.
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.
Affected components
4Anthropic in the last 90 days
Full historyIncidents in 90 days
50
Days with an incident
42
Median duration
1 h 8 min
This incident
2.6× the median
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The issue affecting Claude services has been resolved.
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