Three infrastructure bugs intermittently degrade Claude responses
Aug 5, 00:00 UTCSep 18, 00:00 UTC
Duration
44d
Impact
Major
Root cause
Bug
Anthropic, 90 days
94 incidents
Affected
Claude APIClaude.aiAmazon BedrockVertex AIGlobal
Lesson: Quality regressions hide in normal variance; continuous evaluations on production traffic catch what user reports cannot.
What happened
A context window routing error from August 5, an output corruption misconfiguration from August 25 and a TPU compiler bug from August 26 overlapped, degrading some responses. A load balancing change on August 29 widened the routing bug. Fixes rolled out from September 4 to September 18.
More from Anthropic
Full history| Started | Incident | Impact | Duration |
|---|---|---|---|
| Sep 2200:57 UTC | Elevated errors for multiple models | major | 1h 38m |
| Sep 1616:18 UTC | Issues with Google Play subscriptions | none | 33m |
| Sep 1509:48 UTC | Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1 | major | 1h 26m |
| Sep 1114:19 UTC | Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1 | major | 17m |
| Sep 1021:43 UTC | Elevated latency on the Claude API for some users | minor | 1h 41m |
| Sep 1015:54 UTC | Degraded functionality for Claude Cowork on Windows | major | 4d 3h |
Also caused by software bug
All| Started | Vendor | Incident | Impact | Duration |
|---|---|---|---|---|
| Sep 1518:57 UTC |  ClickHouse | ClickPipes failing on Kinesis in AWS us-east-1ClickHouse | critical | 29h 46m |
| Sep 318:20 UTC |  Twilio | Retroactive Incident: Twilio Personalized Support Phone Line AffectedTwilio | none | 0m |
| Aug 819:48 UTC |  Grafana Labs | Alerting expressions pipeline failing when recovery settingsGrafana Labs | minor | 0m |
| Aug 615:22 UTC |  GitHub | Incident with ActionsGitHub | critical | 10h 42m |
| Jul 2314:14 UTC |  Box | [Medium] Issues with Box HubsBox | major | 16m |
| Jun 1719:00 UTC | GitHub | Incident With WebhooksGitHub | none | 0m |
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