Incidentsby GlyphThree 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
49 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 historyDegraded performance for Claude Fable 5.1lasted 26mElevated errors affecting the Google Calendar connectorlasted 3h 46mElevated errors affecting the Gmail connectorlasted 1h 49mElevated errors for Claude Sonnet 5.5lasted 41mElevated errors for Claude Sonnet 5.5lasted 42mElevated errors for Claude Fable 5.1lasted 32m