OpenAI

GPT-5.5 Pro

Name: OpenAI GPT-5.5 Pro
Author: OpenAI

Compare

Model ID:gpt-5.5-pro-2026-04-24

2026-04-24

Compare

GPT-5.5 Pro is OpenAI's most advanced reasoning model, built on the GPT-5.5 architecture with extended compute. It features a 1M+ token context window with text and image inputs, using deeper thinking to deliver consistently high-quality answers on the most demanding problems in coding, mathematics, research, and multi-step planning. As the first fully retrained base model since GPT-4.5, it is the optimal choice for professional workflows where accuracy and depth take priority over response time.

API|VisionReasoningWeb Search|Proprietary Model

Knowledge Cutoff

2025-12-01

The date this AI finished learning. It may not know about things that happened after this date.

Input → Output Format

The types of content this AI can receive, and what it can produce in return.

Context Memory

1.1MIN128KOUT

The maximum amount of text the AI can read and process in a single request. A larger number means it can handle longer documents or conversations.

Cost/1M Words

$30IN$180OUT

The cost of using this AI directly in your own application. Shown in USD per 1 million units of text (tokens).