Released Apr 24, 20261,050,000 context$5/M input tokens$30/M output tokens
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.
Recent activity on GPT-5.5
Total usage per day on OpenRouter
Prompt
23.1B
Completion
176M
Reasoning
143M
Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.
OpenAI: GPT-5.5 – Recent Activity and Usage Stats | OpenRouter