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Claude API input_transformations adds thinking_mismatch_allowed entries in beta

BetaVerifiedAdded Sep 22, 2026

Under the thinking-binding-controls-2026-08-01 beta header, input_transformations can report thinking_mismatch_allowed for thinking blocks that failed an unenforced prefix check. Logging these entries helps find conversation history edits in production traffic.

Topics: LLMs, Observability, Developer tools

Anthropic's release notes

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