GPT-5.5 Pro

OpenAI· released 24 Apr 2026

openai/gpt-5.5-pro

Input / 1M tokens: $30
Output / 1M tokens: $180

Context window1.1M tokens

Longest answer: 128K tokens

reads filereads imagereads texttool callingvisionreasoning

About

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...

Details

Lab: OpenAIopenrouter.ai · 3 Oct 2026
Context: 1,050Kopenrouter.ai · 3 Oct 2026
Input price: $30 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $180 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 128,000 tokensopenrouter.ai · 3 Oct 2026
Inputs: file, image, textopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/openai/gpt-5.5-pro· checked 3 Oct 2026