OpenAI prepares to expand Ultrafast API to more users
By Alexey Shabanov, TestingCatalog
Picture: TestingCatalog
OpenAI appears to be preparing a wider rollout of its Ultrafast API mode around DevDay on September 29, with new references showing up across the OpenAI Platform and API documentation. TestingCatalog spotted a dedicated speed selector being prepared for the Responses API Playground (currently hidden), where developers could choose between Standard, Fast, and Ultrafast processing. OpenAI has already officially previewed Ultrafast with GPT-5.6 Sol, describing speeds of up to 750 output tokens per second and up to 14× faster inference than Standard. Access remains limited to selected customers, and OpenAI confirmed that the mode is powered by Cerebras. The timing makes broader availability during DevDay plausible. OpenAI has since released the GPT-6 family, including GPT-6 Sol and GPT-6 Astra, making support for these newer models a key thing to watch.
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