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openaiOpenAI: GPT-5.5 Pro
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...
openai/gpt-5.5-pro
Context Size
1,050K
Input Price
3,000,000 Ks/M
Output Price
18,000,000 Ks/M
Architecture
File
Image
Text
Supported Parameters
include_reasoningmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools
Details
TokenizerGPT
Max Completion128,000 tokens
Provider Context1,050K tokens
ModeratedYes
CreatedApr 24, 2026