Elevated error rates on Claude Opus and Sonnet 4.6

What to do

• Check whether you use Anthropic claude.ai, Claude Console (platform.claude.com), Claude API (api.anthropic.com), Claude Code. 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 35m it lasted.

  Anything that failed between 2026-03-21 00:07 UTC and 2026-03-21 01:42 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 4

1. investigatingMar 21, 2026, 12:07 AM UTC

   We are currently investigating elevated error rates affecting Claude Opus 4.6. Our team is actively working to identify the root cause.

   provider

2. identifiedMar 21, 2026, 12:17 AM UTC

   We have identified an issue resulting in elevated errors on both Claude Opus and Sonnet 4.6, and are working to resolve this issue as quickly as possible.

   provider

3. identifiedMar 21, 2026, 12:58 AM UTC

   We have observed success rates return to normal for Claude Opus 4.6, and are working to fully resolve elevated errors for Claude Sonnet 4.6.

   provider

4. resolvedMar 21, 2026, 1:42 AM UTC

   This incident has been resolved.

   provider

Corrections

None so far.

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