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...
The figures
- Made by
- OpenAI
- Model ID
- openai/gpt-5.5-pro
- Input
- $30 per million tokens
- Output
- $180 per million tokens
- Context window
- 1.05M tokens
- Longest answer
- 128K tokens
- Takes in
- file, image, text
- Gives back
- text
- Reasoning
- Yes
- Tool calling
- Yes
- Reads images
- Yes
- Open weights
- No
- Released
- 24 Apr 2026
Read on 3 Oct 2026.