Ideogram 4.5 low and FLUX.2 Pro both cost $0.0375 an image on Sume

Ideogram 4.5 at low quality and FLUX.2 Pro both list at $0.0375 per image on Sume. For 240 posters that is 240 x $0.0375 = $9.00 either way. Ideogram 4.5 at medium is $0.075 (240 images: $18.00) and at high it is $0.275 ($66.00), because Sume bills the vendor's $0.03, $0.06 and $0.22 per image list prices times 1.25.

The tie is a pricing coincidence, and the two rows do different things, so the useful question is which one fits your poster.

Two rows, one price

The Image API docs state Ideogram 4.5's Fal list price as $0.03, $0.06 or $0.22 per image by quality, for all sizes, with a default of medium. BFL's pricing page lists FLUX.2 [pro] from $0.03 for text-to-image and from $0.045 for image editing, and Sume's price list has a single FLUX.2 Pro row at $0.0375, which is $0.03 times 1.25.

How to choose between them

Ideogram 4.5 gives you a quality dial. Without input references it generates from text. With references it edits the first image and uses up to four more as references, five in total. Resolution can be 1K or 2K. An edit without aspect_ratio keeps the source image's shape. That makes it a good fit when you want to draft at $0.0375, then re-run the winner at high for $0.275.

FLUX.2 Pro has no quality dial in the Sume catalog, and BFL's own page prices its editing from $0.045, higher than its text-to-image start, so check usage.cost on an edit before you assume the Sume figure holds for every size. If you want fine control over typography, BFL describes FLUX.2 [flex] as the typography option, and Sume lists Flex at $0.0625.

A draft-then-final plan

For 240 posters, draft all at Ideogram low ($9.00), pick the best 24, and render them again at high ($0.275 x 24 = $6.60). The two-stage plan costs $15.60 against $66.00 for rendering all 240 at high. That assumes one draft in ten survives; if you keep one in two, 120 finals at high cost $33.00 and the total is $42.00.

Sume bills only completed generations, so a draft that fails costs nothing.

Checking the price on your own account

Run one image on each row and read usage.cost in the response. The Sume list is a rate card, and billed amounts round up to the cent, so a single image at $0.0375 may show as $0.04 while the batch of 240 is the figure to budget on. If the two rows return different costs in practice for your size or edit mode, trust the response over this post and update your estimate.

Because the tie sits at the lowest price points of two different model families, it is also a cheap way to compare them: 24 prompts on each row cost 24 x $0.0375 x 2 = $1.80 in total.