OpenAI previews Ultrafast tier for GPT-5.6 Sol with up to 14x speed

OpenAI introduced Ultrafast, an API service tier for GPT-5.6 Sol that runs up to 14 times faster than the standard path and produces as many as 750 output tokens per second. It is available only as a limited preview for select customers, with no launch pricing or wider-availability timetable published. Cerebras powers the speedup.

• Tier delivers up to 14x speed and 750 output tokens per second
• Ultrafast is a speed class for GPT-5.6 Sol, not a separate model
• Available only as a limited preview for select customers
• Launch pricing and wider-availability timeline not published