Elevated errors for Claude Sonnet 5.5 and other models

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 1h 39m it lasted.

  Anything that failed between 2026-10-25 06:14 UTC and 2026-10-25 07:53 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.

Root cause

We have identified the cause of elevated errors on requests to Claude Sonnet 5.

Updates from Anthropic 4

1. investigatingOct 25, 2026, 6:14 AM UTC

   We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.

   provider

2. identifiedOct 25, 2026, 6:27 AM UTC

   We have identified the cause of elevated errors on requests to Claude Sonnet 5.5 and are working on a fix. We will provide an update as soon as possible.

   provider

3. monitoringOct 25, 2026, 6:35 AM UTC

   A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

   provider

4. resolvedOct 25, 2026, 7:53 AM UTC

   The issue affecting Claude services has been resolved. Impact occurred from 23:05 PT on October 24 / 06:05 UTC on October 25 to 23:35 PT on October 24 / 06:35 UTC on October 25.

   provider

Corrections

None so far.

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