OpenAI· GPT / ChatGPT / APIProduct launch

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

OpenAI previews Ultrafast, a new API service tier for GPT-5.6 Sol that offers up to 14× faster inference and up to 750 output tokens per second, powered by Cerebras hardware.

From the source

Preview Ultrafast, a new OpenAI API service tier that runs GPT-5.6 Sol up to 14× faster. Powered by Cerebras, it delivers up to 750 output tokens per second.

openai.com

Announced

13 Aug 2026 10:00 UTC

Detected

14 Aug 2026 13:13 UTC (+27h after)