AI Models
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OpenAI
Released April 2026
GPT-5.5
Frontier reasoning, complex professional workloads, 1M context
Reasoning
Tool Use
Vision
About this model
GPT-5.5 is OpenAI's frontier model designed for complex professional workloads, delivering stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token context window and excels at long-horizon problem solving, advanced coding, and rigorous analytical work where accuracy and depth matter most.
Context Window
1M
Input Cost
$5/M
Output Cost
$30/M
Input Types
Text, Image