# Previewing Ultrafast mode: GPT-5.6 Sol at up to 14X the speed

Ultrafast mode is available in limited preview via the OpenAI API, powered by Cerebras, at up to 750 output tokens per second.

- Early customers testing Ultrafast include Jane Street, Podium, Basis, and Rogo.
- OpenAI uses Ultrafast internally for incident response and to condense overnight research runs into same-day iterations.
- Access expands as capacity grows; businesses can sign up for updates.

## Why it matters

For developers and businesses using the OpenAI API, Ultrafast removes the speed-intelligence trade-off, enabling real-time workflows with frontier intelligence.

## Sources

- [OpenAI: Previewing Ultrafast mode: GPT-5.6 Sol at up to 14X the speed](https://openai.com/index/previewing-ultrafast)

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Summarized by dstilled on 2026-08-13. https://dstilled.ai/story/51bf61fa-e733-45d3-9358-50ba88fcc33a