Claude Status · History · Incident #144730

RESOLVED

Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Major · Started Oct 5, 2026 · 1:05 PM

Duration

15m
Severity

Major
Detection lead

—
User reports

Peak 1/hr

Summary

Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

The issue affecting Claude Mythos 5.1 and Claude Fable 5.1 has been resolved. Impact occurred from 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC.

Started

Oct 5, 2026 · 1:05 PM
Resolved

Oct 5, 2026 · 1:21 PM
Duration

15m
Severity

Major

Event timeline

How this incident unfolded

◐

Investigating
Oct 5 · 1:05 PM Claude

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.
✓

Resolved
Oct 5 · 1:21 PM Claude

The issue affecting Claude Mythos 5.1 and Claude Fable 5.1 has been resolved. Impact occurred from 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC.

User reports · incident window

Report volume over time

Hourly report count. Red bars mark the incident window.

Peak: 1 reports/hr

← Before incident After →

Pattern

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