GPT-5.5

GPT-5.5 ranks second on the Artificial Analysis Intelligence Index as of mid-2026, making it one of the top two general-purpose AI models available. OpenAI positioned it as a strong all-rounder: capable at coding, writing, analysis, and multimodal tasks. The xhigh pricing tier targets enterprise customers requiring maximum compute allocation. The Canvas editor integration makes it particularly effective for long-form writing and document iteration workflows.