Fast mode replaces Priority Processing

Fast mode replaced the Priority Processing tier. For GPT-5.6 Sol it runs up to 2.5 times faster than standard processing at twice the price, and requests tagged priority automatically use Fast mode.

Who is affected:: API customers who used Priority Processing.
What to do:: Check your bills for Fast mode pricing on requests tagged priority.

Source

"This change is backward compatible: requests tagged priority will automatically use Fast mode."

OpenAI API changelog

Published Jul 30, 2026

Open the sourcedevelopers.openai.com

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