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OpenAIapi

July 30, 2026·Source

Fast Mode in the OpenAI API

A paid speed tier that runs GPT-5.6 Sol up to 2.5 times faster for double the price. It replaces the old Priority Processing option.

Details

Fast mode serves GPT-5.6 Sol up to 2.5 times faster than standard processing and costs twice as much per token
Model quality is unchanged, the only difference is serving speed
It replaces Priority Processing, and requests already tagged priority route to Fast mode automatically with no code change
Available in the OpenAI API

Best for

Anything where a person sits waiting on the answer, like a live chat surface or an internal tool used in the moment.

When to use it

Latency is what users complain about and you can absorb double the token cost on that specific call.

Who benefits

Developers running customer-facing features on GPT-5.6 Sol.

More from OpenAI

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Fast Mode in the OpenAI API | OpenAI | Chasing Next