GPT-5.6 Default Settings Can Bill Up to 10x More Without These Two Fixes

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Developers using OpenAI's GPT-5.6 may be overpaying due to two expensive default parameter settings in the API. Omitting the reasoning_effort parameter results in billing 1.5 times more than explicitly setting it to 'none', even when response quality remains identical. Similarly, failing to mark stable prompt prefixes with explicit cache breakpoints means those sections are billed at the full input rate rather than the 10% cached read rate. A structured request format — pinning reasoning_effort and using prompt_cache_options with explicit breakpoints — can significantly reduce per-call costs. Developers should also note that these caching parameters are incompatible with GPT-5.5 and older models, requiring version-specific rollout handling.

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