Unverified50% confidenceEventExact time
Claude Sonnet 5.5 recently experienced a service incident with an elevated request error rate.
1
Sources
50%
Confidence
Short-term (~14 days)
Relevance
10/27/2026
First Seen
Valid until: 11/10/2026
Sources
Related Entities
Related Claims
UnverifiedThe earlier Sonnet 5 had mediocre benchmark scores and suffered from runaway cost increases on complex tasks.74% similarUnverifiedThis performance degradation mainly affects API requests to Claude Fable 5, manifesting as elevated errors.68% similarPartially VerifiedClaude Fable 5 experienced an elevated request error rate at 19:49 UTC on October 21.65% similarUnverifiedClaude Sonnet 5.5's thinking mode cannot be turned off, forced tool calls will return an error, and non-default sampling parameters will return an error.65% similarUnverifiedThe status page update explicitly mentioned that requests to other Claude models also showed elevated error rates, indicating signs that the problem spread to adjacent services.64% similar
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