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