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OpenAI: GPT-5.5 Pro

openai/gpt-5.5-pro

Released Apr 24, 20261,050,000 context$30/M input tokens$180/M output tokens

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 text and image inputs, and is designed for long-horizon problem solving, agentic coding, and precise execution across multi-step workflows.

Recent activity on GPT-5.5 Pro

Total usage per day on OpenRouter

Prompt
133M
Reasoning
10.3M
Completion
2.83M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.