Several Claude models experience elevated error rates; cause identified
According to the Claude Status report, the cause of elevated error rates affecting Claude Fable 5.1, Sonnet 5.5 and Haiku 5.5, as well as fast mode for Opus 5.5, has been identified. Work on a fix continues.
According to the Claude Status operational update from 23 October at 23:39 UTC, the cause of elevated error rates for requests to Claude Fable 5.1, Sonnet 5.5 and Haiku 5.5 had been identified. The incident also affects requests in fast mode for Opus 5.5. Work on a fix continues.
The initial report at 23:37 UTC said errors affecting Claude Fable 5.1 were under investigation. An update two minutes later expanded the list of affected models and modes. The report does not yet confirm that the incident has been resolved.
Why it matters
The incident affects several models simultaneously. Users and businesses that depend on their responses therefore need to expect more frequent failed requests even after the announcement that the cause has been identified.
Two audiences, two different impacts
What this means
For individuals
When working with the affected models, you may encounter errors more often and fail to get the response you need.
For a business
For business processes using the affected models, the incident poses a risk of incomplete tasks that depend on their responses.
ProcessesCheck the original
Event sources
clearly official source · 1 publisher, 0 independent. We count feeds from the same owner only once.