Ideogram 4.5 output size per aspect ratio at 1K and 2K on Sume

On Sume, Ideogram 4.5 returns a fixed pixel size for each of its 15 aspect ratios: 1024x1024 for 1:1 at 1K and 2048x2048 at 2K, 2560x1440 for 16:9 at 2K. Only 1:3 and 3:1 ignore the tier, and four ratios are larger on a 1K edit than on text-to-image.

The table comes from the size map in the Sume image adapter on main, checked on 2026-10-05 by calling the size resolver directly. No image was generated to produce it.

Sizes by ratio

Send aspect_ratio and resolution (1K or 2K) on POST /v1/images with model: ideogram/ideogram-v4.5. Without resolution the tier is 1K.

Edits are larger at 1K for four ratios

When you send input_references, the first image is the one being edited. For that case at 1K, Sume uses a bigger size for four ratios: 16:9 gives 1536x864, 9:16 gives 864x1536, 2:1 gives 1408x704 and 1:2 gives 704x1408. Every other ratio uses the table above, and 2K edits use the 2K column.

So the same aspect_ratio: "16:9" request is 1280x720 as a text prompt and 1536x864 as an edit. Plan your crop or your CSS box from the call type, not from the ratio alone.

What the 2K tier does not do

3:1 and 1:3 are the same at both tiers so the 2K tier adds nothing there. If you need more pixels than that, upscale afterwards instead of expecting resolution: 2K to help.

The size does not change the price. The Fal list price is by quality only (read 2026-10-05), and Sume bills list x 1.25, so picking 2K over 1K costs nothing extra on Sume.

Request

The edit below asks for 16:9 and gets 1536x864 back at the default 1K tier.

import os, requests

r = requests.post(
    "https://api.sume.com/v1/images",
    headers={"Authorization": f"Bearer {os.environ['SUME_API_KEY']}"},
    json={
        "model": "ideogram/ideogram-v4.5",
        "prompt": "Same product, same label, softer window light",
        "input_references": [{"image_url": {"url": "https://example.com/src.jpg"}}],
        "aspect_ratio": "16:9",
    },
    timeout=120,
)
r.raise_for_status()
body = r.json()
print(r.status_code, body.get("data", [{}])[0].get("url"))

When not to use this table

If you need the output to match your source pixel for pixel, leave aspect_ratio out. An edit with no aspect and no size keeps the source geometry, which is also how the Ideogram API describes its own edit endpoint (read 2026-10-05). Use the table only when you want a new shape, and check the returned image size in code before you publish.