seedinteger
Random seed for reproducibility (0-2147483647).
Happy Horse 1.1 Text to Video
alibaba/happy-horse/1.1/text-to-videoHappy Horse 1.1 is Alibaba's text-to-video AI model. Turn written scripts and prompts into professional-quality video clips with realistic motion, lighting, and scene composition.
Try the model
Playground
Input
Text prompt describing the desired video. Max 2500 characters.
Additional Settings More
Customize your input with more control.
The aspect ratio of the generated image. Allowed values: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16.
Output video resolution tier. Allowed values: 480p, 720p, 1080p.
Output video duration in seconds (3-15). Allowed values: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
Random seed for reproducibility (0-2147483647).
ResultExample
What would you like to do next?
Examples
Select an example to load its inputs and result into the playground.
- Open result ↗
Input
{ "aspect_ratio": "3:2", "duration": 3, "prompt": "A red paper boat floating on a calm lake", "resolution": "720p" }
Human preference
Arena
Elo ratings from blind side-by-side votes, compared with other image and video models.
Rankings sourced from Artificial Analysis Arena
- Leaderboard
- Text to Video
- Rank
- #13 of 33
- Elo
- 1032 ±17
- Gap to #1
- −111
Text-to-video arena (silent): people pick the better of two clips from the same prompt, without seeing the model names; audio is not judged.
- #8Dreamina Seedance 2.01082±17
- #9Gemini Omni Flash 1.11067±17
- #10Agnes-Video-2.51054±17
- #11Grok Imagine Video 1.51034±17
- #12HappyHorse-1.01032±17
- #13HappyHorse-1.11032±17
- #14Wan2.7-2606121022±17
- #15MAGI-2 Preview1008±16
- #16Kling 3.0 1080p (Pro)1000
- #17PixVerse V6993±17
Happy Horse 1.1 Text to Video
Happy Horse 1.1 turns a written script into a 3–15 second cinematic clip with realistic motion, lighting, and fine detail. Version 1.1 adds a 480p draft tier and lowers the 1080p rate compared with 1.0.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
prompt | string, required | — | Text instruction. |
aspect_ratio | 21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16 | 16:9 | Output frame shape. |
resolution | 480p / 720p / 1080p | 720p | Sets the per-second rate. |
duration | 3–15 | 5 | Output length in seconds. |
seed | integer | random | Fix it to compare prompt changes. |
Billing
You pay for output seconds: $0.07 at 480p, $0.14 at 720p, and $0.18 at 1080p, Alibaba's list price.
| Output | 480p | 720p | 1080p |
|---|---|---|---|
| 3s | $0.21 | $0.42 | $0.54 |
| 5s (default) | $0.35 | $0.70 | $0.90 |
| 10s | $0.70 | $1.40 | $1.80 |
| 15s | $1.05 | $2.10 | $2.70 |
Failed runs are not charged.
Prompting
- Describe the shot in order: subject, action, setting, camera move, light, and sound.
- Give camera timing explicitly, e.g. “holds for two seconds, then pushes in slowly”.
- Put spoken lines in quotes and say who speaks them.
Limits
- Text only; to start from a picture use
alibaba/happy-horse/1.1/image-to-video.
Also on SandBase
Other Happy Horse endpoints: alibaba/happy-horse/1.1/image-to-video, alibaba/happy-horse/1.1/reference-to-video, alibaba/happy-horse/video-edit (edit an existing clip).
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "alibaba/happy-horse/1.1/text-to-video",
"prompt": "A little girl walking on the road at sunset, cinematic lighting, smooth camera movement.",
"duration": 5,
"resolution": "720p",
"aspect_ratio": "16:9"
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
promptstringrequired
Text prompt describing the desired video. Max 2500 characters.
durationinteger
Output video duration in seconds (3-15).
Default: 5
Possible values: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
resolutionstring
Output video resolution tier.
Default: "720p"
Possible values: "480p", "720p", "1080p"
aspect_ratiostring
The aspect ratio of the generated image.
Default: "16:9"
Possible values: "21:9", "16:9", "3:2", "4:3", "5:4", "1:1", "4:5", "3:4", "2:3", "9:16"
{
"model": "alibaba/happy-horse/1.1/text-to-video",
"prompt": "A little girl walking on the road at sunset, cinematic lighting, smooth camera movement.",
"duration": 5,
"resolution": "720p",
"aspect_ratio": "16:9"
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
[
{
"poster": "https://static.sandbase.ai/examples/posters/48ecb311a16e096f0922.jpg",
"source": "Self organization completed prediction",
"source_url": "https://www.sandbase.ai",
"url": "https://static.sandbase.ai/examples/be32b42d-bc51-4638-b26f-5d346116f9c8/output/d2337d28-22cc-46ed-be16-f373f6c73221.mp4"
}
]