Cerebras silicon pushes GPT-5.6 Sol to 750 tokens per second in OpenAI preview

OpenAI on Thursday opened a limited preview of Ultrafast. GPT-5.6 Sol is running at the API service tier, at up to 750 output tokens per second.

The ChatGPT maker said the tier processes up to 14x faster than standard processing. The company is testing it with a limited number of API customers as it gauges demand and capacity.

Cerebras silicon does the heavy lifting

The speed is from Cerebras (NASDAQ: CBRS), the chipmaker that made a compute deal with OpenAI in January.

Cerebras said Thursday its chip powers GPT-5.6 Sol. The chip is wafer-sized and has 44 GB of SRAM on the die.

In January, OpenAI agreed to buy up to 750 megawatts of Cerebras compute over three years. Capacity is expected to arrive in tranches through 2028. Sam Altman is listed as an investor in Cerebras.

Ultrafast runs 5x faster than Claude Opus 4.8 in Fast mode and 11x faster than Claude Fable 5 on output speeds, Cerebras said. Anthropic ships its own accelerated Claude Fast mode, but it doesn’t hit the numbers OpenAI is quoting.

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