GPT-5.5 Pro
OpenAI's highest-accuracy variant of GPT-5.5, tuned for complex research, advanced mathematics, and retrieval-heavy workflows
GPT-5.5 Pro
OpenAI β’ April 2026
Training Data
Not disclosed
GPT-5.5 Pro
April 2026
Parameters
Not disclosed
Training Method
Token-Efficient Unified Architecture
Context Window
1,000,000 tokens
Knowledge Cutoff
Not disclosed
Key Features
1M Token Context β’ Highest Accuracy β’ Research-Optimized β’ Deep Reasoning
Capabilities
Research: Maximum
Math: Outstanding
Biology: Outstanding
What's New in This Version
Tops GPT-5.5 on the hardest reasoning benchmarks β 39.6% FrontierMath Tier 4, 90.1% BrowseComp, 33.2% GeneBench β at 6x the token price
OpenAI's highest-accuracy variant of GPT-5.5, tuned for complex research, advanced mathematics, and retrieval-heavy workflows
What's New in This Version
Tops GPT-5.5 on the hardest reasoning benchmarks β 39.6% FrontierMath Tier 4, 90.1% BrowseComp, 33.2% GeneBench β at 6x the token price
Technical Specifications
Key Features
Capabilities
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