Unverified50% confidenceEventExact time
Bug two was that a configuration error in Claude API's TPU servers caused incorrect token generation, occasionally assigning high probability to tokens that should rarely appear, resulting in English prompts getting Thai or Chinese replies and code syntax errors; this problem affected Opus 4.1 and Opus 4 from August 25 to 28 and Sonnet 4 until a rollback on September 2, and third-party platforms were not affected.
1
Sources
50%
Confidence
Long-term
Relevance
10/19/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedBug three originated from code deployed in August 2025 that improved the token selection logic (removing a temporary workaround from December 2024), which inadvertently triggered a latent bug in the XLA:TPU compiler, causing the approximate top-k algorithm to return completely wrong results under specific batch sizes and model configurations, and the same prompt might work one time and fail the next.74% similarUnverifiedBug 3 was confirmed on Haiku 3.5 and rolled back on September 4; Anthropic believes it may have affected some Sonnet 4 and Opus 3 requests on the Claude API, and Opus 3 was rolled back on September 12; the final fix was to switch to exact top-k and normalize some operations to fp32, accepting a slight efficiency loss.73% similarUnverifiedVersion 3.0.2 fixes error handling logic, now directly exposing the error_type error code instead of returning a generic failure message.65% similarUnverifiedSDK v3.20.0 now retries on unmapped TLS transport errors.60% similarUnverifiedIncident timeline: a large number of error reports was first confirmed at 14:21 UTC; it expanded to the Claude API at 14:28 UTC; mitigation measures were implemented at 14:36 UTC and the error rate dropped significantly; most services recovered at 14:59 UTC but a second independent issue was exposed (SSO and Apple login unavailable); and at 16:27 UTC all issues were announced as resolved.58% similar
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