OpenAI Launches Ultrafast API Tier for GPT-5.6 Sol, Offering Up to 14x Faster Output

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OpenAI announced on August 13, 2026, a new API service tier called Ultrafast for its GPT-5.6 Sol model, capable of generating up to 750 output tokens per second — roughly 14 times faster than the standard processing path. The tier is powered by Cerebras and is positioned for time-sensitive applications such as incident response, voice assistants, financial monitoring, and live customer support. Ultrafast is not a new model but a speed-class option layered on top of GPT-5.6 Sol, currently available only to a limited group of preview customers. OpenAI has not disclosed pricing or a timeline for broader availability, stating that access will expand as capacity increases. The restricted access and absent pricing mean most development teams cannot yet factor Ultrafast into production planning or cost comparisons.

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