About 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.
Specifications
- Provider
- OpenAI
- Context Length
- 1,050,000 tokens
- Input Types
- file, image, text
- Output Types
- text
- Category
- GPT
- Added
- 4/24/2026