Cerebras and OpenAI launch GPT-5.6 Sol Ultrafast mode
Cerebras and OpenAI launched Ultrafast Mode, a new service tier in the OpenAI API powered by Cerebras, delivering up to 750 output tokens per second with no quality compromise. In Cerebras tests, GPT-5.6 Sol on Ultrafast answered all 2,500 HLE questions in 11 hours 11 minutes, nearly 7x faster than Claude Fable 5.
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