Model dossier

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...

ProviderOpenAI Start comparison

Context1,050,000

Max output128,000

Pricing viewTVP price

Identity

OpenAI: GPT-5.5 Pro

Model ID: openai/gpt-5.5-pro
Canonical slug: openai/gpt-5.5-pro-20260423
Knowledge cutoff: 2025-12-01
Created: 4/24/2026

Capabilities

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Modalities

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Capacity

Context1,050,000

Max output128,000

TokenizerGPT