Anthropic Post-Mortem Blames Three Bugs for Claude Quality Drop in August-September 2025

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Anthropic's 17 September 2025 post-mortem attributes a reported decline in Claude's quality to three separate bugs that surfaced between August and early September 2025. One bug, introduced August 5, misrouted some Sonnet 4 requests to servers configured for the wrong context window, and a load balancing change on August 29 worsened the problem. A TPU misconfiguration caused Thai or Chinese characters to appear in English responses, and a separate issue affected token selection, with a fix rolled out in early September. Anthropic said its evaluations failed to capture the degradation users reported, and privacy controls limited engineers' access to the affected conversations. The company says it will expand continuous quality evaluations and improve debugging tools.

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