AI Models
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OpenAI
Released April 2026
GPT-5.5
Frontier reasoning, advanced agents, deep research
Reasoning
Tool Use
Vision
About this model
GPT-5.5 is OpenAI's flagship frontier reasoning model, engineered for the most demanding agentic workflows, deep research, and complex problem-solving tasks. With a 1M+ context window and 128K output, it handles entire codebases, lengthy documents, and multi-step reasoning chains while maintaining coherence and accuracy.
Context Window
1M
Input Cost
$5/M
Output Cost
$30/M
Input Types
Text, Image