Degraded performance for Claude Fable 5.1

Summary

The provider says Claude Fable 5.1 had elevated errors on requests, affecting claude.ai, the Claude API, Claude Code, and Claude Cowork, from 08:18 to 08:32 UTC on Nov 8. A fix was deployed, and the provider says the issue is resolved.

Written by anthropic/claude-haiku-5.5 from Anthropic's own updates.

What to do

• Check whether you use Anthropic claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 26m it lasted.

  Anything that failed between 2026-11-08 08:28 UTC and 2026-11-08 08:54 UTC may need a replay.

• Subscribe to Anthropic's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=anthropic works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Anthropic 3

1. investigatingNov 8, 2026, 8:28 AM UTC

   We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.

   provider

2. monitoringNov 8, 2026, 8:39 AM UTC

   A fix has been deployed for Claude Fable 5.1 and we are monitoring for recovery.

   provider

3. resolvedNov 8, 2026, 8:54 AM UTC

   The issue affecting claude.ai, the Claude API, Claude Code, and Claude Cowork has been resolved. Impact occurred from 00:18 PT / 08:18 UTC on Nov 8 to 00:32 PT / 08:32 UTC on Nov 8.

   provider

Corrections

None so far.

Something wrong on this page? Report an error or send us a note. Every fix is listed here.