GPT-6.1

OpenAI has released GPT-6.1 Sol Pro, which runs the same underlying GPT-6.1 Sol model with reasoning.mode set to 'pro' for higher-accuracy responses on complex tasks. It costs several times more per request than standard GPT-6.1 Sol and is priced at $2/$10 per 1M input/output tokens with a 1.1M token context window.

OpenAI released v3.21.0 of its official Python SDK on September 29, 2026, adding a constant for a new 'GPT-6.1 Sol' model identifier. No pricing, benchmarks, or capability details have been disclosed.