GPT-5.5 Pro

Name: GPT-5.5 Pro
Author: OpenAI

Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding

Live

Open / InstallLast updated August 5, 2026

Description

Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding. Supports a context window of 1,050,000 tokens. Supports extended reasoning. Supports tool calling. Input priced at $30 per million tokens. Weights are not publicly released; access is via the provider API.

Author

OpenAI

Platform

api

Pricing model

paid

Capabilities

Text generation
1,050,000 token context
Extended reasoning
Tool calling
File attachments
Image input

Benchmarks

No benchmark results have been added yet.