# GPT-5.5: AI model fact sheet

- **Provider:** openai
- **Released:** 2026-04-24
- **Context window:** 1,050,000 tokens
- **API pricing:** $5.00 / 1M input, $30.00 / 1M output
- **OpenRouter ID:** openai/gpt-5.5
- **Capabilities:** conversation, reasoning, code-generation, analysis, agentic-tool-use

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.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/gpt-5.5