Context Window
1.1M tokens
Parameters
Undisclosed
Source
Closed
Modality
Text, Vision, Audio, Code
GPT-5.5 is OpenAI’s frontier model with state-of-the-art reasoning and coding capabilities. Features extended thinking modes for complex problems.
Specifications
Technical details
Developer
OpenAI
Model Family
GPT-5
Parameters
Undisclosed
Context Window
1,100,000 tokens (1.1M)
Modality
Text, Vision, Audio, Code
Open Source
No
License
Proprietary
API Available
Yes
Release Date
April 1, 2026
Pricing
$7.78 blended per M tokens