OpenAI has released GPT-5.6, which introduces several changes to its pricing structure that impact users running the model at scale. While the flagship model's price per million tokens remains the same as GPT-5.5, cache writes, previously free, now incur a cost of 1.25 times the input rate. Additionally, default settings for image detail and reasoning levels have been altered. These changes necessitate a review of cost governance strategies, as previously unmeasured cache write tokens are now a significant cost factor. AI
IMPACT Users running AI models at scale must now account for new costs associated with cache writes, potentially altering cost governance strategies.
RANK_REASON Frontier-lab model release with pricing and feature changes. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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