GPT-5.6 Sol
OpenAI's frontier flagship model for complex professional work. Supports adjustable reasoning effort from none to max.
Best for
Complex reasoning, agentic coding, multi-step professional workflows
Strengths
Frontier-class reasoning with adjustable effort levels (none to max)
1.05M context window with 128K max output
Built-in web search, file search, and computer use tools
Best-in-class for complex multi-step agentic workflows
When to use
Choose GPT-5.6 Sol when you need the absolute best reasoning available — complex architectural decisions, multi-file refactoring with deep understanding, security audits, and any task where getting it right matters more than speed. The adjustable reasoning effort lets you dial cost vs quality.
Limitations
Highest cost in the GPT-5.6 family ($5/$30 per MTok). For balanced workloads, Terra provides nearly equivalent quality at half the price. For simple generation tasks, Luna or Nano are more cost-effective.
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