T2V · 10s · 9:16
Post-apocalyptic wasteland
Cinematic atmosphere · slow camera pull-out
Happy Horse 1.0 Video Generator
The Happy Horse 1.0 playground on UGCFast — turn a text prompt or first-frame image into a 720P or 1080P video with native joint video + audio in 7 languages. Generations are billed in UGCFast credits at submission and refunded automatically if the upstream submission fails.
0/2500
Describe the scene, motion, lighting…
5s
3s15s
Advanced
Adds 'Happy Horse' at the bottom-right corner of the video.
Optional integer 0..2^31. Same seed + same params = more reproducible output (not exact).
Estimated cost0.6 credits720P · 5s
Pricing anchor: 720P × 8s = 1.0 credit. 1080P doubles the per-second rate. Cost is rounded to 0.1 credits.
Real outputs · real prompts
39 Happy Horse demo videos — with the prompts that made them
Every clip below was generated by Happy Horse 1.0, the same model the tool above runs. Tap Use this prompt to prefill the generator and remix it with your own scene.
T2V · 10s · 16:9
Paris film romance
Vintage 90s film grain · synced dialogue
T2V · 10s · 16:9
American comic superhero
Animated comic style · drama from a one-line prompt
T2V · 10s · 16:9
Anthropomorphic fruit comedy
Pixar-style talking-fruit sketch from a one-line prompt
T2V · 10s · 16:9
Noir detective scene
Two detectives, basement lighting · whispered dialogue
T2V · 10s · 16:9
Android awakening
Sci-fi micro-expression sequence · close-up to wide
T2V · 10s · 16:9
Boy with his project
Warm sunlit room · UGC-style heartfelt monologue
T2V · 8s · 9:16
Cozy creator close-up
Vertical 9:16 talking-head UGC · vlog aesthetic
T2V · 10s · 9:16
Stop-motion claymation
Tactile clay textures · 9:16 vertical
T2V · 10s · 9:16
Hero transformation
Mystical cave · power awakening sequence
T2V · 10s · 9:16
Ethereal dragon priestess
Dark fantasy · intricate metallic costume
T2V · 15s · 16:9
Lego stop-motion
3D-animated Lego style · timelapse build
T2V · 8s · 16:9
Anime shout
Makoto-Shinkai-style backlit teen with synced Japanese line
T2V · 10s · 16:9
K-drama hospital scene
Synced Korean dialogue · classic melodrama
T2V · 9s · 53:30
Pixar-style cactus
3D animation · whimsical character
T2V · 8s · 16:9
Forest path POV
Sound design demo · ambient breath of the woods
T2V · 10s · 16:9
Trunk shot stand-off
70s film grain · low-angle confrontation
T2V · 10s · 16:9
Ancient general overlooking the army
Wuxia battlefield panorama
T2V · 8s · 9:16
Snowboard grab in mid-air
Action sport · mid-air rotation
T2V · 10s · 16:9
Korean cafe date
10s romantic dialogue · cinematic shot list
I2V · 15s · 9:16
I2V
I2VK-pop idol stage
Vertical 9:16 stage performance with rim lights
I2V · 10s · 2:3
I2V
I2VTwo jellyfish in deep blue
Bioluminescent · breathing-rhythm motion
I2V · 15s · 9:16
I2V
I2VAquarium selfie date
Synced Mandarin dialogue · I2V from a still
I2V · 5s · 2:3
I2V
I2VReading dog (I2V from still)
First-frame animation · cute character
I2V · 10s · 9:16
I2V
I2VTalking watermelon
I2V product spokesperson with synced English line
I2V · 15s · 16:9
I2V
I2VPrincess close-up reveal
Slow zoom into eyes · cinematic lashes
I2V · 8s · 9:16
I2V
I2VVolcano awakening
Time-lapse cloud sea · epic orbit
I2V · 15s · 9:16
I2V
I2VDragon contract
Beat-by-beat scene script · scaled fantasy
I2V · 5s · 16:9
I2V
I2VCorn cat — talking I2V
Synced Mandarin: 玉米大丰收 · perfect lip-sync
I2V · 15s · 9:16
I2V
I2VDunhuang flying dance
Silk ribbons · classical Chinese aesthetic
I2V · 5s · 2:3
I2V
I2VSun-dappled puppy
Liquid-gold light · slow orbit · falling petals
V2V · 8s · 53:29
Ink-painting mountains
Style transfer to traditional Chinese ink-wash
V2V · 15s · 53:29
Red rose bouquet
Multi-image I2V · narrative transformation
V2V · 7s · 53:29
Ink-painting koi
Style transfer · ink bloom motion
I2V · 8s · 9:16
I2V
I2VThree court ladies in ink
Subtle motion on a static ink painting
I2V · 8s · 16:9
I2V
I2VPool light reflections
Lazy summer afternoon · dappled water
I2V · 8s · 16:9
I2V
I2VJellyfish waltz
Glowing jellyfish swarm · ballroom-of-the-sea
I2V · 5s · 1:1
I2V
I2VProduct bottle splash
Slow water beads · skincare-ad cinematography
I2V · 5s · 9:16
I2V
I2VAstronaut visor reflection
I2V with surreal pull-in into a tiny world
Demo videos render at 480P for fast loading. The live tool above produces full 720P or 1080P MP4s with credits.
The Happy Horse 1.0 video generator, hosted on UGCFast
Happy Horse 1.0 is the open-source AI video generation model that appeared anonymously on every major text-to-video and image-to-video benchmark on April 7, 2026 — and immediately ranked #1. Three days later, Alibaba’s ATH Innovation Unit claimed it. It is a single-stream 15-billion-parameter, 40-layer Transformer with a sandwich layout: 4 modality-specific layers, 32 fully shared layers, 4 modality-specific output layers. Text, images, video and audio share the same token space, which is why it can generate joint native audio + video in a single pass — including 7-language lip-sync (English, Mandarin, Cantonese, Japanese, Korean, German, French).
This page is the public Happy Horse playground on UGCFast. The generator above renders 720P or 1080P MP4s directly from a text prompt or a first-frame image. Generations are billed in UGCFast credits at submission and refunded automatically if the upstream submission fails — there is no monthly subscription, and the per-second rate is identical to what the upstream Happy Horse API charges (720P = 0.125 cr/s, 1080P = 0.25 cr/s, rounded to 0.1).
For the full architectural deep-dive, see our blog post What is Happy Horse 1.0? The #1 AI video generation model explained. If you want to self-host the open weights, our Happy Horse open-source guide walks through the inference code, distilled checkpoint, and super-resolution module. For a head-to-head, see Happy Horse vs Kling, Sora and Seedance.
What makes it different
Why creators are switching to Happy Horse 1.0
Native joint audio + video
Generates dialogue, ambient sound and Foley in the same forward pass as the picture — no separate TTS or sync step. 7-language lip-sync (English, Mandarin, Cantonese, Japanese, Korean, German, French).
#1 on the Artificial Analysis leaderboard
Topped the public T2V and I2V blind tests on launch. Sora 2 dropped to #20 on the same evaluation. Subjective quality on motion, faces and stability is class-leading.
1080p in ~38 seconds (H100)
DMD-2 8-step distillation plus FP8 quantisation make Happy Horse meaningfully faster than diffusion models with comparable quality. The render time you see in this tool is mostly queue, not compute.
Open source and commercial-licensed
Alibaba released full weights, the distilled checkpoint, the super-resolution module and the inference code under a license that permits commercial use — see our self-host guide.
Faithful prompt following
The 39 demos on this page are not curated highlights — they are real outputs with the actual prompts. Beat-by-beat scene breakdowns, dialogue with quoted lines, and style-transfer instructions all hold.
5 aspect ratios and 3–15s durations
Native 1080p at 16:9, 9:16, 1:1, 4:3 and 3:4 — generated independently without the quality drop you see when other models upscale a single base ratio.
How it works
From prompt to MP4 in three steps
- 1
Write a prompt or upload a first frame
Describe the scene, motion, lighting and (optionally) dialogue — Happy Horse handles lip-sync. Or switch to first-frame I2V and upload a still; the model animates it forward.
- 2
Pick duration, ratio and resolution
3–15 seconds. Aspect ratios 16:9, 9:16, 1:1, 4:3, 3:4. Resolution 720P or 1080P. The credit cost updates live so there are no surprises.
- 3
Generate and download
Submit, wait 1–5 minutes while the model renders, and download the MP4. The video URL is valid for 24 hours; the file itself is yours forever.
Use cases
What people generate with Happy Horse
Vertical 9:16 UGC ads
Talking-head deliveries, product close-ups and lifestyle b-roll for TikTok, Reels and YouTube Shorts — see the Sweet Smile, Idol Stage and Snowboard demos.
Cinematic short-film pre-vis
Noir, sci-fi, romance, wuxia. Director-style scene breakdowns survive the round-trip — Detective, Paris Romance and Ancient General show the range.
Lip-synced multilingual dialogue
Drop quoted lines into the prompt and Happy Horse phonemes-and-mouths them in the language you specified. Korean K-drama, Japanese anime shout, Mandarin spokesperson — all in the gallery.
Image-to-video animation
Upload a single still and animate it forward — works for character reveals (princess close-up), atmospheric scenes (volcano, jellyfish), and product b-roll.
Style transfer / art direction
Convert a normal source video to traditional Chinese ink-painting, comic, claymation or Pixar-style 3D while keeping the original camera path. The Ink Koi and Ink Mountain demos show the technique.
Animation styles without an animator
Lego stop-motion, anime (Makoto Shinkai aesthetic), American comic, claymation — all from short prompts. No re-training, no LoRAs needed.
Prompting
How to write a prompt Happy Horse actually understands
The 39-clip gallery above is the best documentation we’ve got — every card shows the exact prompt that produced the video. Patterns we keep seeing in prompts that work:
- 1.Lead with the subject, then the camera. “Close-up of a barista pouring espresso, slow dolly-in, 35mm film” beats “a video of coffee” every time.
- 2.Use a beat-by-beat scene breakdown for clips longer than 8s — list what happens at 0–3s, 3–6s, etc. Happy Horse follows it surprisingly well (see the Maker boy and Lego boy demos above).
- 3.Quote dialogue in actual quotation marks with the language called out — e.g. “In Korean she says: ‘...’” The model lip-syncs the phonemes for that language. Keep lines short (one or two clauses per shot).
- 4.Describe lighting and lens. “Golden hour rim light, anamorphic 2.39:1, shallow depth of field” produces dramatically better grading than “cinematic” alone.
- 5.For image-to-video, anchor the motion. The first frame locks composition — your prompt only needs to say what should *change* (camera movement, character action, wind, blink, lip-sync, ink-bloom transition).
- 6.Style transfer prompts work. The ink koi and ink mountain demos in the gallery convert a normal video to traditional Chinese ink-painting while preserving the original camera path — useful for art-direction-heavy ad work.
FAQ
Happy Horse video generator — common questions
Is Happy Horse free?
No — generations cost UGCFast credits. Each second of video is billed at 0.125 credits per second at 720P or 0.25 credits per second at 1080P (rounded to 0.1). New accounts get trial credits to try the tool, after that you top up as you go. There is no monthly subscription.
What model is Happy Horse, exactly?
Happy Horse 1.0 is a 15-billion-parameter unified single-stream Transformer with a 40-layer 'sandwich' design (4 modality-specific + 32 shared + 4 modality-specific). It was released anonymously on April 7, 2026 on the public AI video benchmarks and claimed by Alibaba's ATH Innovation Unit on April 10. It is open source. It is not Tongyi Wanxiang or any other earlier Alibaba model.
How is Happy Horse different from Sora 2 / Kling / Seedance?
Two big things. (1) Native joint audio + video in a single pass with 7-language lip-sync — most competitors still bolt audio on after generation. (2) On the Artificial Analysis leaderboard at launch, Happy Horse beat Sora 2 (which dropped to #20) and Seedance 2.0 by ~60 Elo. Sora has stronger text-rendering inside the frame; Happy Horse has stronger motion realism and cross-modal sync.
How long does a generation take?
Typically 1–5 minutes per video on this tool. The page polls every 5 seconds and surfaces the live status (PENDING → RUNNING → SUCCEEDED). The compute itself is fast (around 38 seconds for 1080P on an H100); most of the wait is queue depth.
Can I use the videos commercially?
Yes — videos you generate here are yours to use in ads, social posts and client work. Standard rules apply: don't generate likenesses of real people without permission, and follow the upstream content policy.
What aspect ratios and durations are supported?
Aspect ratios 16:9, 9:16, 1:1, 4:3 and 3:4 (text-to-video). For first-frame image-to-video the ratio is auto-derived from your input image. Durations 3, 5, 8, 10 or 15 seconds.
Is Happy Horse really open source?
Yes. Alibaba ATH released full model weights, the distilled checkpoint, the super-resolution module and inference code under a license that permits commercial use. Our open-source self-host guide walks through running it on a single H100. This UGCFast tool is a hosted alternative for anyone who doesn't want to run their own GPU.
What happens if a generation fails?
If the upstream API rejects the submission (content policy, malformed input, etc.) we refund the credits automatically. If a render starts and then crashes upstream, contact support — refund handling mirrors the upstream policy.
Will my video have a watermark?
Watermark is on by default and adds a small 'Happy Horse' mark in the corner. You can turn it off in the Advanced section before generating.
Does Happy Horse support image-to-video?
Yes. Switch to 'First-frame image to video' at the top of the form and paste a public HTTPS URL to a JPEG / PNG / WEBP image (≥300px, ≤10MB, aspect ratio between 1:2.5 and 2.5:1). The first frame anchors composition; your prompt describes the motion.
Keep building with UGCFast
Happy Horse is one model — explore the rest of the UGC stack.
Happy Horse 1.0 explained
Architecture, benchmarks and what the unified single-stream design means.
Happy Horse vs Kling, Sora, Seedance
Side-by-side on motion, dialogue, latency and price.
Self-host Happy Horse
Run the open weights on your own H100 — inference code, distilled model, super-res.
Happy Horse for UGC video ads
Templates and prompt patterns for converting product URLs into 9:16 ads.
AI UGC video generator
Talking-head UGC ads with AI actors and lip-synced voiceovers.
Batch UGC generation
Generate 10 ad variants from one product URL — pair with Happy Horse b-roll.
Happy Horse 1.0 video generator — terms covered on this page
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