OpenAI: GPT-5.5

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, enabling large-scale reasoning, coding, and multimodal workflows within a single system.

• Context window: 1,050,000 tokens
• Input: file, image, text
• Output: text
• Pricing: $5/M input tokens, $30/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.