HappyHorse vs Seedance 2.0 vs Kling v3 Pro: Who Wins When

You do not pick a video model by staring at a leaderboard. You pick it by answering four questions about the job.

The three models on the table:

• HappyHorse 1.0 ranked #1 on Artificial Analysis for both T2V (Elo 1333) and I2V (Elo 1392), about 60 Elo points clear of Seedance 2.0. Native audio and video joint synthesis. Not yet on the public fal.ai endpoint.
• Seedance 2.0 throughput workhorse at roughly $0.014 per unit, so a 5 second 720p clip is about $0.07. Fast iteration, clean motion, multi-shot in one request.
• Kling v3 Pro cinematic specialist at $0.14 per second at 1080p. Strong on 15 second single takes.

The four questions

Walk the decision down these four, in order. Stop at the first definite yes.

1. Do you need dialogue with lip sync?

If the deliverable has a character speaking on camera and you cannot redub in post, use HappyHorse. Joint audio video synthesis is the single capability the other two do not match. Seedance 2.0 gives you silent dialogue. Kling v3 Pro gives you a cinematic mime.

2. Do you need a 15 second single take?

If you need an uninterrupted 15 second shot with consistent subject motion and no cut, use Kling v3 Pro. It holds the longest usable takes today. HappyHorse caps at about 38 seconds at 1080p but is tuned for shorter scenes. Seedance 2.0 is fine up to 8 to 10 seconds and drifts beyond that.

3. Do you iterate on drafts 50 times per day?

If you are a draftsperson who needs 50 variations before lunch, use Seedance 2.0. At roughly $0.014 per unit it is five to ten times cheaper than Kling on like for like resolutions. HappyHorse pricing has not landed on the public card yet, but for draft work cost pressure points you at Seedance.

4. Do you need multi-shot in one request?

If your prompt describes a sequence of shots (kitchen, then alley, then rooftop) rendered from one request, use Seedance 2.0. Its scene composition is the strongest on that flow.

Default if none apply: HappyHorse for hero deliverables, Seedance for drafts and volume, Kling for long cinematic single takes.

A worked price comparison

For a 5 second clip at 720p:

For 100 draft shots, Seedance runs about $7. Kling runs about $70. HappyHorse will almost certainly land above Seedance because joint audio adds compute. For 10 hero cinematic shots, the math inverts. A 5 second Kling shot at $0.70 is a rounding error when you are cutting for broadcast.

Buyer profiles

Social content team. Short videos, no lip sync required, high volume. Use Seedance 2.0 for 95 percent of the work. Reach for HappyHorse when a dialogue scene lands on the calendar.

Agency creative director. One hero spot, polished cut, music bed final in studio, no synthetic voice on the master. Use Kling v3 Pro for long takes and Seedance 2.0 to pre visualize camera language before the Kling burn.

Indie storyteller. Character driven, dialogue central, supported language. HappyHorse is the backbone. Use Seedance 2.0 for storyboard and scratch. Use Kling for any shot that needs a 15 second hold.

The minimal code surface

The endpoint shape is the same for all three, which is convenient when you route a job at runtime.

1import { fal } from "@fal-ai/client";
2
3async function render(job) {
4  const model = job.needsLipSync
5    ? "fal-ai/seedance-2.0/text-to-video" // or fal-ai/happyhorse/v1/text-to-video once available
6    : job.needs15sTake
7      ? "fal-ai/kling-video/v3/pro/text-to-video"
8      : "fal-ai/seedance-2.0/text-to-video";
9
10  const out = await fal.subscribe(model, {
11    input: { prompt: job.prompt, resolution: job.resolution ?? "720p", duration: job.duration ?? 5, aspect_ratio: "16:9" },
12    logs: true
13  });
14
15  return out.data.video.url;
16}

The selection logic earns its keep. Rerun the four questions each time a new project lands.