OpenAI Launches GPT-6.1 Sol API: Key Changes, Pricing, and Migration Guide

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OpenAI released GPT-6.1 Sol at its DevDay event on September 29, 2026, introducing a newer version of its Sol reasoning model. Developers can access it via a POST request to the OpenAI Responses API endpoint using the model ID 'gpt-6.1-sol' with a Bearer token. Standard input and output pricing remains unchanged at $2 and $10 per million tokens respectively, though cached input costs have been halved from $0.20 to $0.10 per million tokens. A key migration change is that GPT-6.1 Sol no longer supports 'none' or 'minimal' reasoning effort levels, requiring developers to remap those calls to 'low'. Additionally, function calling via the Chat Completions endpoint is no longer supported, and developers must migrate tool-based workflows to the Responses API.

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