OpenAI introduces ‘Ultrafast,’ a new mode that makes GPT 5.6 Sol work at 14x the speed

The company says that Ultrafast can work at 14x the speed of standard processing, delivering up to 750 output tokens — such tokens represent the distinct pieces of text generated by an LLM when it interacts with a human — per second.

“Until now, getting real-time speed typically meant choosing a smaller or more specialized model,” the company said in a blog post on Thursday. “Ultrafast points to progress in a new direction: more useful work per second.”

OpenAI’s competitors, like Anthropic, have similarly launched accelerated versions of their models. Claude has fast mode, although it doesn’t deliver the kind of speed that OpenAI is offering here.

OpenAI suggests that this high-octane version of GPT 5.6 Sol can be deployed across a number of different corporate workflows, most notably incident response, customer service and support, financial market analysis, and e-commerce, among other relevant areas.

Ultrafast, which is currently being released in preview, is being powered by OpenAI’s partnership with chipmaker Cerebras. Currently, that preview is only being made available to a small group of customers, although OpenAI says that it will expand access to the feature as “capacity grows.”