20 ultrawide 21:9 website heroes on Sume: from $0.50 to $3.75

The short answer

Twenty 21:9 website hero images cost $0.50 on qwen-image, $0.75 on flux-2-pro, $1.00 on recraft-v4, $1.25 on flux-2-flex, $2.00 on nano-banana-2.1 at 1K, or $3.75 on nano-banana-pro at 1K or 2K. Along with qwen-image-max at $1.88, these are the eight Sume rows whose aspect list includes 21:9, per the repo's image catalog. GPT Image 2.5, Seedream, Imagen and Ideogram do not list it.

The eight rows

The aspect lists come from Sume's image catalog in the repo, and the prices from the lead-verified list as of 2026-10-09. Nano Banana 2.1 appears twice because its price depends on the tier.

Why ratio, not pixels

A 21:9 hero is a 2.33:1 strip. Ask for it with aspect_ratio: "21:9" on a model that lists it. Sending the ratio to a model that does not list it returns 400 unsupported_parameter; Sume does not drop the field. sume/auto follows the GPT family, so a 21:9 request to Auto is rejected too. Name a model that lists the ratio.

If the page needs a specific pixel width such as 2560, generate at the highest tier you can afford and resize in your own code. Nano Banana 2.1 at 2K is the most common starting point here; its repo list also covers 4:1 and 8:1 if a thinner strip is needed later.

Picking a model

Start from the content. If the hero has text in it, test the models with the best text results first. If it is an abstract background, the cheapest row will probably do.

Crop safety matters for heroes. Keep the subject in the middle third, as ultrawide layouts often crop the sides on narrow screens.

A practical order

Start with the 2.5-cent qwen-image row to settle the layout, since 20 drafts are 50 cents. Move the three or four layouts you like to Nano Banana 2.1 at 2K. Add any text in the page itself, not in the image, so the headline stays editable and sharp at every width.

Arithmetic for the heroes: 20 x 0.025 = $0.50 for the lowest row and 20 x 0.1875 = $3.75 for the highest. The spread is 7.5 times, but both bills are small, so quality should drive the choice and the price should only break ties.

Export each hero in the exact pixel size your page uses. A 21:9 image on a 1440-wide layout is 1440 x 617 at its native display size, so a 2K render gives plenty of room for retina screens.

Finally, test the hero in the actual page layout before choosing. Place the image at its real width, then check it at phone width, where a 21:9 crop may cut the sides sharply.