OpenAI

GPT-5.5 Pro

openai/gpt-5.5-pro

JSON

Specification

Published by the vendor; the platform bills at the target's declared price.

GPT-5.5 Pro

reasoning tools

OpenAI 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...

Input $/1M: $30.0
Output $/1M: $180
Context: 1.1M
Max output: 128K
Released: Apr 24, 2026
Modalities: fileimagetext

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targets.yamlyaml

# targets.yaml - declare a target that runs GPT-5.5 Pro
targets:
  - id: gpt-5-5-pro
    kind: llm
    name: GPT-5.5 Pro
    metadata:
      model: openai/gpt-5.5-pro          # links the target to this catalogue entry
    capabilities:
      domains: [general]
      supports_tools: true
      context_window: 1050000
    cost:
      usd_per_1k_tokens: 0.105000

Price among OpenAI models

Input list price per million tokens; GPT-5.5 Pro is the most expensive of 13 listed.

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