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AI video model comparison

FLUX 3 vs Runway Gen-4.5

Runway Gen-4.5 is 20% cheaper (cheapest second: FLUX 3 $0.38/s vs Runway Gen-4.5 $0.31/s). FLUX 3 has longer clips, more reference images and native audio. Runway Gen-4.5 has the cheapest clip and faster renders.

Head to head

2 of 4 models · prices from the live catalog,

FLUX 3Black Forest LabsnewTry it →
Runway Gen-4.5RunwayhotTry it →
Price
Cheapest second$0.38/s$0.31/s (best)
Per second at 720p$0.38/sNot offered
Per second at 1080p$0.61/sNot offered
Cheapest clip$1.91$0.61 (best)
A 5-second clip at 720p$1.91Not offered
A 10-second clip at 1080p$6.11Not offered
Speed and length
Render time~2–5 min~1–2 min (best)
Longest clip20s (best)10s
Clip lengths5–20s2–10s
Output
Top resolutionfhd—
Frames21:9 · 2:1 · 16:9 · 4:3 · 1:1 · 3:4 · 9:161280:720 · 720:1280 · 1584:672 · 1104:832 · 832:1104 · 960:960
SoundNative (best)—
Inputs
Takes10Text · 10 images1Text · 1 image
Reference imagesUp to 10 (best)Up to 1
NeedsA promptA prompt
What it does
Can doText → videoImage → videoMulti-referenceText → videoImage → video
Good forNative audio · Dialogue scenes · Up to 20sStudio workflows · VFX plates · Brand work
Settings you controlFrame · Audio · Length · Keyframe times · Resolution · Safety toleranceContent moderation · Length · Frame · Seed

Same prompt, side by side

No category has a render from two of these models yet. Each model’s own renders are further down.

Which should you choose?

Choose FLUX 3 if you want

  • longer clips
  • more reference images
  • native audio
  • multi-reference, which the other cannot do
  • dialogue scenes
Generate with FLUX 3 →

Choose Runway Gen-4.5 if you want

  • a lower price per second
  • the cheapest clip
  • faster renders
  • studio workflows
  • VFX plates
Generate with Runway Gen-4.5 →

More from each model

Runway Gen-4.5

A cork pops from a bottle, foam rises and spills over the lip, high-speed look, studio black background
Slow dolly in on a woman standing at a rain-streaked window, her reflection sharpens as the camera closes, cool daylight, locked vertical framing
A man in a grey wool coat walks toward camera down a cobbled lane as the camera tracks backward, his face and coat hold steady the whole take, overcast light
Static wide of a night highway overpass, cars stream beneath as light trails with natural motion blur, city skyline behind
Handheld two-shot of a glassblower and an apprentice at a furnace, the camera steps around them as the molten glass glows, faces and aprons consistent through the move

Compare with others

FLUX 3 vs …

Runway Gen-4.5 vs …

← All video models, compared

How we compare

  • Prices come from the live catalog at the pay-as-you-go rate. The quote before you generate is binding. Plans and packs
  • Render times are the catalog’s own estimate for one render.
  • Every clip and image on this page was rendered on OpenClips.

Questions

FLUX 3 vs Runway Gen-4.5: questions

Runway Gen-4.5 costs the least here (cheapest second). FLUX 3: $0.38/s. Runway Gen-4.5: $0.31/s. Prices are at the pay-as-you-go rate. The quote before you generate is binding.

Runway Gen-4.5 is the fastest here. FLUX 3 takes ~2–5 min. Runway Gen-4.5 takes ~1–2 min.

FLUX 3 and Runway Gen-4.5 take a still as the first frame or a reference.

FLUX 3 makes up to 20 seconds. Runway Gen-4.5 makes up to 10 seconds.

FLUX 3 renders native audio with the picture. Runway Gen-4.5: silent.