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OpenAI: 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...

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Specification
Model ID
openai/gpt-5.5-pro
Modality
Text+image+file >text
Context
1.1M tokens
Input
$30.00/1M
Output
$180.00/1M
Web search
$10000.00/1M
Updated
Sep 20, 2026
Scores
Capabilities
  • Supports tool calling
  • Supports vision inputs
  • Supports long-context workflows
  • Supports deeper reasoning tasks

Input and output

Accepts File, Image, Text inputs. Returns Text outputs.

Supported parameters

include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools

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