GPT-5.6 Sol changelog

GPT-5.6 Sol price cut to $4 input and $20 output

GPT-5.6 Sol now costs $4 per million input tokens and $20 per million output tokens, 20% lower for input and 33% lower for output.

Who is affected:

Apps using GPT-5.6 Sol.

What to do:

No action needed. Note this is promotional pricing (see the November 21 event).

GPT-5.6 Sol promotional price runs at least through November 21

GPT-5.6 Sol's promotional pricing ($4 input, $20 output per million tokens) runs at least through November 21, 2026. OpenAI has not said what the price will be after that date.

Takes effect Nov 21, 2026 · in 20 days

Who is affected:

Apps budgeting on GPT-5.6 Sol at the promotional price.

Action needed:

Budget for a possible price increase after November 21, 2026, or evaluate GPT-6.1 Sol.

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.