GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
Specifications
- Provider
- OpenAI
- Type
- Vendor / proprietary
- Modality
- text+image+file->text
- Context window
- 1050K
- Knowledge cutoff
- 2025-12-01
- Released
- April 24, 2026
Capabilities
Input: fileInput: imageInput: textOutput: textReasoning requiredConfigurable reasoning effort
Strengths
include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools
