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Previewing Ultrafast mode: GPT-5.6 Sol at up to 14X the speed
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OpenAI is previewing Ultrafast, a new API service tier that runs GPT-5.6 Sol up to 14× faster, powered by Cerebras to deliver up to 750 output tokens per second.
This new tier offers a substantial speed increase for GPT-5.6 Sol, which could reduce latency for time-sensitive applications. The material does not provide pricing or availability details, so the cost and operational constraints remain unknown.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
OpenAI is previewing Ultrafast, a new API service tier for GPT-5.6 Sol.
The tier runs up to 14× faster, delivering up to 750 output tokens per second.
Cerebras hardware powers the increased inference speed.
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OpenAI is previewing Ultrafast, a new API service tier that significantly accelerates the GPT-5.6 Sol model. The service runs up to 14 times faster, delivering up to 750 output tokens per second. This performance increase is powered by Cerebras, indicating a specific hardware partnership for this tier.
For engineers, the primary change is a major reduction in inference latency for GPT-5.6 Sol. The provided material does not state what adopting this Ultrafast tier costs, leaving the price impact on API budgets unknown. Engineers will need to wait for pricing details to evaluate the cost-benefit.
The material also does not specify where this Ultrafast mode stops working or if there are regional limitations. The preview is the only available information, and broader availability or constraints are not detailed. Engineers should treat this as an early look at a performance-focused tier rather than a fully detailed production release.
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