GPT-5.5 Pro is OpenAI’s flagship large language model designed for the most demanding AI tasks. As the highest-performance model in the GPT-5.5 series, it delivers enhanced reasoning, deeper analysis, advanced coding capabilities, and improved reliability for professional use cases.
Compared with standard models, GPT-5.5 Pro uses additional computing resources to achieve stronger performance in complex problem solving, research analysis, software engineering, AI Agent workflows, and long-term task execution.
The model is built for developers, researchers, and businesses that require highly accurate AI assistance. It can power applications such as AI Agents, intelligent assistants, enterprise knowledge systems, automation platforms, advanced analytics tools, and professional research solutions.
With support for a 1.05M token context window, GPT-5.5 Pro can process large documents, extensive codebases, research materials, and enterprise knowledge resources, making it ideal for complex information analysis and large-scale AI workflows.
GPT-5.5 Pro also supports advanced capabilities including Function Calling, Structured Outputs, Web Search, File Search, Code Interpreter, and MCP, enabling developers to build powerful AI applications with deeper integrations.
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