Previewing Ultrafast mode: GPT-5.6 Sol at up to 14X the speed
Preview Ultrafast, a new OpenAI API service tier that runs GPT-5.6 Sol up to 14× faster. Powered by Cerebras, it delivers up to 750 output tokens per second.
OpenAI is launching Ultrafast, a new service tier that runs its most intelligent model up to 14 times faster than standard processing, generating up to 750 output tokens per second through a partnership with Cerebras. Previously, achieving real-time speed required using smaller or less capable models, but this advancement maintains full intelligence while dramatically improving speed. The service is being tested with select customers in areas like incident response, financial analysis, customer support, and commerce, where the ability to respond instantly without sacrificing reasoning capability creates business value. The limited preview is currently available only to initial customers, with broader access planned as capacity grows.
Explainer: What Is GPT-5.6? OpenAI's Newest Model Family, Explained
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