Added Ultrafast mode for GPT-6.1 Sol in the Responses API.
OpenAI · developers.openai.com/api/docs/changelog#2026-10-08-1
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Added Ultrafast mode for GPT-6.1 Sol in the Responses API. Use gpt-6.1-sol with service_tier: "ultrafast" to reduce the time between generated output tokens. It is available to all API users, subject to rate limits, with global processing…