Partially Verified65% confidenceEventExact time
Claude Fable 5 experienced an elevated request error rate at 19:49 UTC on October 21.
3
Sources
65%
Confidence
Short-term (~14 days)
Relevance
10/21/2026
First Seen
Valid until: 11/4/2026
Sources
Related Entities
Related Claims
UnverifiedThe two model services Claude Mythos 5.1 and Claude Fable 5.1 began showing an abnormal rise in request error rates at 05:40 Pacific Time (12:40 UTC).72% similarUnverifiedThis performance degradation mainly affects API requests to Claude Fable 5, manifesting as elevated errors.68% similarUnverifiedAt 18:23 UTC, the Claude team identified and fixed the root cause of the delayed credit crediting, and then moved into a monitoring state.58% 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.55% similarUnverifiedA common engineering combination: perform a limited number of exponential backoff retries for 5xx and timeouts, and directly trigger degradation for 429 and persistent elevated errors.54% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/1083119API
curl https://kongchang.com/api/v1/knowledge/claims/1083119MCP
get_claim(id=1083119)