GPT-5.5-PRO-2026-04-23
OpenAI's GPT-5.5-PRO-2026-04-23 is a chat model capable of handling a wide range of tasks, including function calling, reasoning, and text generation. It is particularly notable for its large context window of 1,050,000 tokens, allowing it to process and respond to extensive inputs.
Input
Output
Context
1050K
Max Output
128K
Parameters
-
Technical Specifications
Model TypeChat
Context Window1,050,000 tokens
Max Output Tokens128,000 tokens
ParametersNot available
Release DateApr 22, 2026
Training CutoffDec 1, 2025
Licenseproprietary
Open SourceNo
Input Modalities
ImageText
Output Modalities
Text
Capabilities
Resources & Links
proprietary, Proprietary - API access only
More Models by OpenAI
Related Tools
Data sourced from official provider APIs and documentation
Last updated: Aug 8, 2026
Your AI stack shouldn't stand still.
Every month new models become cheaper, faster, and more capable. Inferbase ensures your application automatically benefits without changing a single API call.