LTX-2 vs Seedance vs HappyHorse: Which AI Video Model Should You Use in 2026?

Three model families cover most of the AI video work people actually do on Moosky: the LTX family (LTX-2.5, the current successor to LTX 2.0 and LTX 2.0 Pro), ByteDance's Seedance line (Seedance 2.5 and the 4K-capable Seedance 2.0), and HappyHorse 1.1. They overlap enough that the wrong pick costs you re-rolls, but they are built for genuinely different jobs. The short answer before any detail: if your characters speak, use LTX-2.5. If you need a single shot longer than fifteen seconds or a big reference kit, use Seedance 2.5. If you have one great still image and want it moving with a cinematic feel, use HappyHorse 1.1. If you need true 4K from a locked start frame, that specific job still belongs to Seedance 2.0.

This article walks through what each model does on Moosky today, where each one loses to the others, and which use case decides it. Every capability here is the live spec on the model's page, not a benchmark rumor: LTX-2.5, Seedance 2.5, Seedance 2.0, and HappyHorse 1.1 all run on Moosky's credit balance with the cost quoted before you generate.

The comparison at a glance

One billing note before the sections: all four run on the same Moosky credit pool at 100 credits per dollar, the exact cost of your resolution and length is shown before you press generate, failed runs are refunded, and output carries commercial use. Subscription is not part of any of these decisions.

LTX-2.5: pick it when someone on screen talks

LTX-2.5 is Lightricks' 22B model and the newest generation of the LTX family on Moosky, the direct successor to LTX 2.0 and LTX 2.0 Pro. Its defining feature is joint audio-video generation: you write the dialogue into the prompt in quotes, and the model renders the picture and the synchronized speech, ambience, and sound effects in a single pass. There is no separate voice tool, no lip-sync step, no foley library. For talking-head scenes, interviews, ad reads, and any shot where a character delivers a line, this is the strongest option of the three families, and it is the reason the LTX family exists on Moosky at all.

The rest of the spec is built around that strength. LTX-2.5 runs text-to-video with no input image, or takes an optional start frame and optional last frame to steer composition. Clips run 4 to 20 seconds, and resolution goes from 720P to 1440P and 4K in landscape, portrait, square, or adaptive, with the caveat that 1440P and 4K clips cap at 10 seconds. Multi-shot continuity helps characters and settings stay consistent when you render several shots of a scene, which matters the moment your video is longer than one clip.

Where it loses: the single-shot length ceiling (20 seconds, and only at 1080P or below) and reference scale. If your production plan is "one continuous 25-second take" or "keep this character identical across thirty reference images," LTX-2.5 is the wrong tool, however good its dialogue is. Earlier searches for "LTX 2.0 Pro" land on the same answer: that was a pro-flavored release of the previous generation, LTX-2.5 supersedes it on every axis, and on Moosky there was never a Pro subscription, just per-clip credits — the LTX 2.0 Pro worth-it guide works that buying math out in full. The LTX family hub covers the generation history, the LTX 2 prompt guide carries the copy-paste recipes for motion, camera, and dialogue shots, and the LTX-2.5 composer runs the model itself.

Seedance 2.5: pick it for length, instruction following, and reference kits

Seedance 2.5 is ByteDance's flagship, and it wins three contests the other models cannot: duration, reference capacity, and breadth of input modes. A single generation can run 30 seconds, twice the practical reach of LTX-2.5's best-quality range and double HappyHorse's ceiling. The reference-to-video mode accepts kits of up to 30 images, 10 videos, and 10 audio clips at once, which is the closest thing these models have to a script supervisor: you feed it the character sheets, the location plates, and a voice reference, and label them in the prompt with Image 1, Video 1, Audio 1 tokens. Audio-only reference jobs are allowed, and combined reference audio just has to stay under 30.1 seconds.

Like LTX-2.5, Seedance 2.5 generates native synchronized audio, including lip-synced dialogue when you put spoken lines in quotes, with optional score. It is also a true text-to-video model, no start frame required, with the aspect-ratio behavior that follows from it: you pick the ratio, and first-last-frame jobs preserve the start frame's own aspect instead of forcing 16:9. Resolution tops out at 1080P, and 1080P is only offered in 16:9 and 9:16; other ratios render at 480P or 720P. The trade-off is deliberate: Moosky's own page calls it a premium, high-cost pick. Use it when the 16-to-30-second single shot, the reference kit, or the flagship instruction following is what the job needs; for a short talking clip, a cheaper model will get you there.

One sibling caveat: "Seedance" is two models on Moosky. Seedance 2.5 is the length-and-references model. Seedance 2.0 is the resolution model: it requires a start frame, offers optional first-to-last-frame interpolation, and on its Normal tier is the only Seedance that renders true 4K (3840x2160), in 4-to-15 second clips. If your brief says 4K and you already have the start frame, that is Seedance 2.0, not 2.5.

HappyHorse 1.1: pick it to bring one great still to life

HappyHorse 1.1 is the specialist for a workflow the other two handle as a side mode: you have one image, and you want it to move like a cinematographer shot it. Its 1.1 release is described by its own specs as a systematic upgrade over 1.0, with more expressive motion, stronger subject consistency across frames, better instruction following, richer visual detail, and improved audio-visual synchronization. Output runs 3 to 15 seconds at 720P or 1080P, landscape or portrait, with text-to-video as a fallback when you have no frame, and watermark off by default.

That focus shows in the prompts. HappyHorse rewards motion direction and sound-aware description: name the camera move, the subject's action, and the atmosphere, and anchor them to the start frame. It is the natural next step after any of Moosky's image models, since your key frame can come from GPT Image 2.5 or Wan 2.7 Image in the same session. The trade-offs are honest: no 4K, no 30-second takes, no 30-image reference kits, and one start frame is the only anchor you get. Use HappyHorse when one starting frame is enough and cinematic style, expressive motion, and camera movement are the deliverable. Choose a first-to-last-frame model instead when the final frame matters as much as the first. The composer is on the HappyHorse page.

The decision, by use case

• A character delivers a line of dialogue: LTX-2.5. Quoted dialogue in the prompt becomes synchronized speech on frame, with ambience and SFX in the same pass. The LTX landing page walks the family and its history.
• One continuous shot longer than 15 seconds: Seedance 2.5, up to 30 seconds in a single render.
• Keep a character or product consistent across many references: Seedance 2.5 R2V (30 images / 10 videos / 10 audio), or MiniMax H3 if the consistency question is really about faces and voices.
• Exactly 4K output: Seedance 2.0 (4K with a required start frame) or LTX-2.5 (4K, up to 10-second clips). HappyHorse stops at 1080P.
• You made one beautiful key frame and want it cinematic: HappyHorse 1.1.
• Drafts and layout tests: any of them at 720P, because on Moosky the credit cost is quoted before every run and drafts are deliberately cheap.
• The whole video, not one clip: Project Director plans the scenes, picks the engine per segment, and assembles the cut, so you stop hand-casting models per clip. Its first-video walkthrough covers the loop end to end.

What people get wrong

The most common mistake is treating the three families as one leaderboard. They are not ranked; they are specialized. People pay Seedance prices for 6-second dialogue clips LTX-2.5 does better, and people fight HappyHorse for 4K output it never claimed to do. The second mistake is starting at final resolution. Render your motion and framing at 720P first; the quote makes iteration cheap, and the failed-run refund means a bad prompt costs nothing.

If you want the wider field beyond these three families, the 2026 tool comparison covers Wan 3.0 and MiniMax H3 alongside them, and the Sora shutdown alternatives guide maps what retired models' users moved to.

Start with the cheapest test

You do not need to commit to a family to evaluate one. Buy credits once, run the same prompt through the LTX-2.5 composer, the Seedance 2.5 composer, and HappyHorse at 720P, and watch which one follows your instruction, holds your subject, and hears your audio note. Whichever one you stop re-rolling is your default; the other two stay on the same balance for the day a job needs their specialty.