Claude Model Quality Issues Resolved

Anthropic addressed two separate bugs last week that caused degraded output quality in some Claude models (Sonnet 4 and Haiku 3.5). The first bug impacted a small percentage of Sonnet 4 requests from August 5th to September 4th, while the second affected some Haiku 3.5 and Sonnet 4 requests from August 26th to September 5th. Anthropic assures users that these issues were not intentional quality degradations but stemmed from unrelated bugs. They thank the community for detailed reports which helped identify and resolve the problems. Monitoring continues for ongoing quality issues, including reports of degradation for Claude Opus 4.1, with an update expected by the end of the week.