For the complete documentation index, see llms.txt. Markdown versions of documentation pages are available by appending .md to the page URL.
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Evaluating Grounded Spatial Reasoning with GPT-5.5
EvalsImagesReasoningVision
May 11, 2026
Build your own content fact checker with gpt-oss-120B, Cerebras, and Parallel
Open ModelsReasoning
Jan 13, 2026
GPT-5 Prompt Migration and Improvement Using the New Optimizer
ReasoningResponses
Aug 7, 2025