OpenAI Cuts GPT-5.6 Sol API and Credit Prices Over 20%

OpenAI updated the GPT-5.6 page on 21 August 2026 to say it had dropped API and credit pricing of GPT-5.6 Sol by over 20 percent for the next 3 months. Sol had been left at $5 input and $30 output per million tokens after the July 30 cuts.

What changed for GPT-5.6 Sol

The 21 August note is short and specific. API price and credit price both move. The cut is over 20 percent. The window is the next 3 months. OpenAI did not publish a new dollar pair for Sol in the facts used here. The verified before-price is $5 input and $30 output per million. The verified after-claim is a cut of over 20 percent, time-boxed.

July 30 already moved the other two rungs. OpenAI cut GPT-5.6 Luna 80 percent and GPT-5.6 Terra 20 percent, and left Sol on the $5 / $30 list. That is why this update is news. The flagship sat still while the cheaper models moved. Later in August the flagship moved too, and only for the next 3 months.

Treat a three-month discount as a discount. A skill that assumes Sol is permanently cheaper will be wrong when the window closes. Put an expiry note next to the route: GPT-5.6 Sol, promotional API and credit price, over 20 percent off, 21 August 2026, next 3 months. When the calendar turns, re-read the price page.

Why the July 30 split still matters

Luna at an 80 percent cut and Terra at a 20 percent cut are the reason a lot of production traffic never needed Sol. Cheap retries on a smaller model can beat one expensive Sol call. They can also waste money if the small model fails twice and you escalate anyway.

The useful pattern is the same one gateway teams already use. Name the job. Pick Luna, Terra, or Sol from the job, not from habit. A skill that hard-codes Sol for every coding pass will spend the discount and then spend the old rate when the three months end.

Do not invent a new Sol dollar figure to make a spreadsheet pretty. If you need a working estimate, apply “over 20 percent” to $5 and $30 and label the result unconfirmed until OpenAI prints the new pair. The page update as cited here does not print that pair.

How to write the skill around a temporary cut

Put price and model in the wrapper. The prompt should say what “done” looks like. The route should say GPT-5.6 Sol, and whether this run is allowed to use the promotional rate. Log tokens and the price assumption. If a client invoice needs a number, quote OpenAI’s “over 20 percent for the next 3 months” line rather than a homemade rate.

Keep a fallback. OpenAI has also slowed a frontier training run when safety work could not clear a bar. Price cuts and training pauses are different files. Together they are a reminder that the lab’s commercial page and the lab’s safety page both move. Your skill should survive both.

The citation sentence is OpenAI, GPT-5.6 Sol, 21 August 2026, API and credit pricing down over 20 percent for the next 3 months. July 30: Luna down 80 percent, Terra down 20 percent. Sol had been $5 input and $30 output per million. Those are the facts.

Sources

• GPT-5.6: Frontier intelligence that scales with your ambition — OpenAI, 21 August 2026