GPT-5.6 Sol
OpenAI's flagship GPT-5.6 model β its most capable system yet for complex coding, cybersecurity, and scientific reasoning, with new max reasoning effort and ultra subagent mode
GPT-5.6 Sol
OpenAI β’ June 2026
Training Data
Not disclosed
GPT-5.6 Sol
June 2026
Parameters
Not disclosed
Training Method
Token-Efficient Unified Architecture
Context Window
1,050,000 tokens
Knowledge Cutoff
February 16, 2026
Key Features
1M Token Context β’ Max Reasoning + Ultra Mode β’ Agentic Coding β’ Frontier Cybersecurity
Capabilities
Coding: Maximum
Cybersecurity: Maximum
Reasoning: Maximum
What's New in This Version
Sets a new state of the art on Terminal-Bench 2.1 (88.8%, 91.9% in Ultra mode), with frontier cybersecurity and biology gains over GPT-5.5; launched at GPT-5.5 pricing ($5/$30 per 1M tokens), promotionally cut to $4/$20 through at least November 21, 2026; generally available since July 9, 2026
OpenAI's flagship GPT-5.6 model β its most capable system yet for complex coding, cybersecurity, and scientific reasoning, with new max reasoning effort and ultra subagent mode
What's New in This Version
Sets a new state of the art on Terminal-Bench 2.1 (88.8%, 91.9% in Ultra mode), with frontier cybersecurity and biology gains over GPT-5.5; launched at GPT-5.5 pricing ($5/$30 per 1M tokens), promotionally cut to $4/$20 through at least November 21, 2026; generally available since July 9, 2026
Technical Specifications
Key Features
Capabilities
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