GPT-5.5
Overview
GPT-5.5, codenamed 'Spud', is OpenAI's latest AI model released on April 23, 2026. It represents a significant advancement in AI capabilities, particularly in coding, general office tasks, computer use, and early-stage scientific research. The model is designed to handle complex, long-running tasks that require extended reasoning and task execution over time. GPT-5.5 is the first OpenAI model to process text, image, audio, and video in a single architecture, offering a unified solution for multimodal tasks. Technically, GPT-5.5 boasts a context window of 1,050,000 tokens and a maximum output of 128,000 tokens, enabling it to manage extensive inputs and generate detailed outputs. It has achieved notable performance benchmarks, scoring 88.7% on SWE-bench Verified and 92.4% on MMLU, indicating its proficiency in various tasks. The model is available through OpenAI's API, with pricing set at $5 per million input tokens and $30 per million output tokens for the standard model, and $30 per million input tokens and $180 per million output tokens for the Pro version. GPT-5.5 is intended for professional applications requiring advanced reasoning and task execution capabilities. Its strengths include coding, long context handling, reasoning, and math. The model is accessible via OpenAI's API and has been integrated into platforms like ChatGPT and Codex, replacing GPT-5.4 as the default model.