18 August 2026

OpenAI tests faster GPT-5.6 mode powered by Cerebras chips

• OpenAI is testing Ultrafast mode for GPT-5.6 Sol, a version running on Cerebras chips that process data faster than usual.
• The faster mode generates text at 750 tokens per second, roughly 14 times quicker than the standard version.
• The speed increase could enable real-time uses like checking code during outages or diagnosing problems as they happen.

How it was covered

MindstreamAdam Biddlecombe

OpenAI is testing Ultrafast mode for GPT-5.6 Sol, powered by Cerebras, which runs up to 14 times faster than Standard mode and produces 750 output tokens per second. The newsletter emphasizes this resolves the historical tradeoff between speed and AI performance, enabling real-time applications like code checking during outages and live issue resolution.

Reported by OpenAI