Runway Gen-4.5 at $0.12 a second: nearest Sume rows by capability

Sume does not carry Runway Gen-4.5, so a job that calls gen4.5 has to move to a different family: the nearest Sume rows with both text-to-video and image-to-video are Wan 3.0, Gemini Omni Flash 1.1 and Kling Video v3 Pro. Runway's models page lists Gen-4.5 as its top text-to-video and image-to-video option at $0.12 per second (Runway API models, read 2026-10-10).

A capability match is not a quality match. The comparison below is about inputs, limits and price, which you can verify in each catalog.

What Runway lists

The same page shows Gen-4 Turbo at $0.05 per second, Aleph 2.0 (in-context editing with keyframe control) at $0.28, and Seedance 2.5 (id seedance2_5, up to 30 seconds at 480p, 720p and 1080p) starting at $0.20. It also mentions partner models and model routers. Runway's page does not give Gen-4.5 durations or resolutions in the text we read, so this post does not compare those.

The nearest Sume rows

Among Sume's rows, these accept both a text prompt and a start image:

What to watch in a port

Pricing is close in dollars, but the inputs are not interchangeable:

• Veo rows are text-only on Sume, so they cannot replace an image-to-video Gen-4.5 call.
• Kling renders 1080p only; a 720p request is accepted and still renders 1080p.
• Omni Flash is capped at 10 seconds and 16:9 or 9:16.
• Wan 3.0 has the widest range (2 to 30 seconds) and takes references.

Routing around the gap

If you cannot choose, send model: "sume/auto" to POST /v1/videos; Sume picks the family and the poll reports sume/auto. It is limited to 3 to 10 second clips at 16:9 or 9:16. If you do care which model runs, pin the id and record it with each clip, because price and look differ by row.