OpenAI

GPT-5.5 Pro

OpenAI•Documentation

gpt-5.5-pro

OpenAI's maximum-capability model in the GPT-5.5 family. Features 1.05M token context window with restricted reasoning options (medium through xhigh) for consistently deep analysis. Same parameter shape as GPT-5.4 Pro.

Use this model with Aisle

Have natural conversations with the model in a familiar interface

Automate tasks, share with your team, and deploy to chat

Test prompt variants, model settings, and compare models side by side

Chain prompts together for complex automation and outcomes

Context Window

1048K

tokens

Max Output

128,000

tokens

Web Search

Available

Structured Output

Available

Supported File Formats

Images

WEBP(20 MB)PNG(20 MB)JPEG(20 MB)GIF(20 MB)

Documents

pdftextdocxlsrtfdocxxlsxpptxpptodtodpods