OpenAI GPT-6.1 Sol API: Key Changes and Migration Guide from GPT-6 Sol

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OpenAI released GPT-6.1 Sol at DevDay on September 29, 2026, as an updated version of its GPT-6 Sol reasoning model. The new model is accessible via a POST request to the Responses API endpoint using the model identifier 'gpt-6.1-sol', with pricing unchanged at $2 input and $10 output per million tokens, though cached input costs drop from $0.20 to $0.10. The most significant breaking change is that GPT-6.1 Sol no longer supports 'none' or 'minimal' reasoning effort levels, requiring developers to migrate those calls to 'low'. The model also drops support for function calls via Chat Completions when using reasoning_effort 'none', and developers are advised to shift tool calls to the Responses API instead. Migration from GPT-6 Sol is otherwise largely a model string replacement, with context window, rate limits, and standard pricing remaining identical.

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