Claude (Anthropic) · 25d ago
Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
ResolvedYes — Claude had a problem on September 15, 2026, and Claude (Anthropic) has since marked it resolved. Claude (Anthropic)'s latest word: “A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.”
Timeline
Started: 9/15/2026, 9:48:23 AM
Last update: 9/15/2026, 11:14:44 AM
Resolved: 9/15/2026, 11:14:44 AM
Affected: rwppv331jlwc, k8w3r06qmzrp, yyzkbfz2thpt, bpp5gb3hpjcl
Updates
resolved
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.
9/15/2026, 11:14:44 AM
monitoring
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.
9/15/2026, 10:50:26 AM
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.
9/15/2026, 9:52:34 AM
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.
9/15/2026, 9:48:23 AM
More Claude (Anthropic) incidents
- Elevated errors on platform.claude.com — ongoing, 3d ago
- Issue with spend limits — resolved, 3d ago
- Elevated errors loading usage data on platform.claude.com — resolved, 4d ago
- Elevated errors for Claude Opus 5.5 — resolved, 4d ago
- Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1 — resolved, 5d ago
- Delayed credits on the Claude Platform — resolved, 9d ago