Unverified50% confidenceSolutionExact time
Older accounts can send the thinking-binding-controls-2026-08-01 beta header and not set prefix_mismatch_behavior, in which case failed blocks still reach the model, and the response lists thinking_mismatch_allowed in input_transformations.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/13/2026
First Seen
Valid until: 1/11/2027
Sources
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