GPT-5.6 Sol Pro
OpenAI
openai/gpt-5.6-sol-proGPT-5.6 Sol Pro is an extended-reasoning version of the Sol flagship tier in OpenAI's GPT-5.6 family, aimed at the hardest complex reasoning, multi-step coding, and long-horizon agentic tasks.
Cost rate
3x
Context
1.1M
Released
Jul 9, 2026
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Output
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Support
ReasoningTool callingStructured outputs