1,200 images under 3 cents: GPT Image 2.5 low, Grok, Imagen 4 Fast

1,200 images cost $29.70 with GPT Image 2.5 at low quality and 1K size, and $30.00 each with Grok Image or Imagen 4 Fast, all through Sume. The cheapest of the three is GPT Image 2.5 low, by $0.30 over the batch. Nano Banana 2.1 is dearer: Google lists it at $0.0336 for a 1K image, and Sume lists $0.10.

Prices for 1,200

The Sume rows come from the public catalog. The Google rows come from Google's Gemini API pricing page, read 2026-10-09.

What low quality costs you

GPT Image 2.5 at low quality is the cheapest listing on Sume, and it is a draft tier by name. If you omit quality, the Image API default for GPT Image 2.5 is high, and auto reserves max, so a request without the field costs far more than the $0.02475 in the table. Set quality: low explicitly when you are buying at this price.

Grok Image and Imagen 4 Fast each list one price in the catalog, so there is no quality default to trip over.

Choosing

For thumbnails, placeholder art or first-pass concepts, any of the top three works on price. Test one prompt on each and keep the one whose output you prefer; the $0.30 difference over 1,200 images is small next to the cost of a wrong style choice. Details are on the Image API page, and Google's numbers are on its pricing page.

Google's batch tier is the cheapest 1K Nano Banana 2.1 route at $20.16, if you can wait and use only Google.

• Cheapest on Sume: GPT Image 2.5 low, with quality set.
• One-price alternatives: Grok Image, Imagen 4 Fast.
• Cheapest overall in this table: Google batch.

Reproduce the numbers

Every Sume price on this page comes from the public catalog at https://api.sume.com/v1/catalog, which needs no API key. Fetch it, find the row for the job or model named in the table, and multiply by your own seconds, characters or image count. Sume bills the list price shown in that row, so the catalog figure is the one that applies to your balance.

Vendor figures were read from Google Gemini API pricing on 2026-10-09 and are the vendor's to change. Where a vendor page did not show a number, this page leaves it out instead of guessing, and any assumption that is ours is labeled as one.