Major incident

Anthropic (Claude): Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Oct 5, 2026, 13:05 UTC

started

13:21 UTC

resolved

16 min

duration

Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork

Current status of Anthropic (Claude): Operational — live Anthropic (Claude) status

Timeline

Oct 5, 2026, 13:05 UTC
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.
Oct 5, 2026, 13:21 UTC
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.

Updates as published by Anthropic (Claude) (original).

This was part of a wider event: 12 services reported incidents within the hour.

DataCamp 13:56 UTC · Interactive Alteryx exercises unavailable
3DSOutscale 13:44 UTC · [cloudgouv-eu-west-1] Incident API / API Incident
LiveKit 13:34 UTC · Investigating scaling issue affecting Cloud Agents in EU (Frankfurt)
LiveIntent 13:22 UTC · Delays in custom reports generation
Voyado 13:16 UTC · Engage - queue/buildup of some contact events
Gong 13:12 UTC · People, Flows, and Gong Extension - Service disruption
Tiendanube AR 13:03 UTC · Interrupción parcial identificada - Administrador Nube
IG 13:00 UTC · login issues on web trading platform
Imagine Learning 12:56 UTC · Imagine Math - Rostering updates delayed
CivicPlus 12:46 UTC · Web Central Degraded Performance
OpenAI 12:44 UTC · Issues saving and editing Pages
Netlify 12:44 UTC · Error accessing Netlify-hosted sites
Crossref 12:21 UTC · Metadata Plus REST API not validating API keys
Cloudinary 12:20 UTC · Usage reports unavailable in Console Dashboard
Axis 12:15 UTC · Video Source Inventory Problem