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

• Context window: 1,050,000 tokens
• Input: file, image, text
• Output: text
• Pricing: $30/M input tokens, $180/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.