Claude (Anthropic) · 2h ago
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
ResolvedYes — Claude had a problem on October 5, 2026, and Claude (Anthropic) has since marked it resolved. Claude (Anthropic)'s latest word: “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.”
Timeline
Started: 10/5/2026, 1:05:44 PM
Last update: 10/5/2026, 1:21:37 PM
Resolved: 10/5/2026, 1:21:37 PM
Affected: rwppv331jlwc, k8w3r06qmzrp, yyzkbfz2thpt, bpp5gb3hpjcl
Updates
resolved
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.
10/5/2026, 1:21:37 PM
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.
10/5/2026, 1:05:44 PM
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