Live8 variants

HappyHorse 1.1 API — Expressive 720p & 1080p Video Generation

Run HappyHorse 1.1 through Muapi for expressive text-to-video, image-to-video, reference-to-video, and natural-language video editing at 720p or 1080p.The upgraded 1.1 release improves motion coherence, prompt adherence, and scene transitions. Every variant uses the same asynchronous submit-and-poll REST pattern, with 720p priced at $0.14/sec and 1080p at $0.18/sec; edit variants use input-video duration.

Get a HappyHorse API Key Try 1080p Text to Video Try 720p Image to Video

HappyHorse 1.1 is live on Muapi

Choose a workflow, submit it with your Muapi API key, and poll the returned request ID for the generated MP4.

1080p production tierPremium resolution for polished delivery and detail-sensitive work4 variants

T2VLive

1080p

HappyHorse 1.1 Text to Video 1080p

Generate expressive 1080p clips from a text prompt with vivid character motion and dynamic scene storytelling.

1080p

$0.18/sec

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I2VLive

1080p

HappyHorse 1.1 Image to Video 1080p

Animate a still image with fluid, expressive 1080p motion; an optional prompt guides the animation direction.

1080p

$0.18/sec

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ReferenceLive

1080p

HappyHorse 1.1 Reference to Video 1080p

Condition generation on 1–9 reference images and a prompt to preserve character appearance and visual style at 1080p.

1080p

$0.18/sec

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Video EditLive

1080p

HappyHorse 1.1 Video Edit 1080p

Apply natural-language edits to an existing video, including wardrobe, prop, environment, and style changes at 1080p.

1080p

$0.18/sec input

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720p iteration tierCost-efficient output for prototyping, social content, and volume4 variants

T2VLive

720p

HappyHorse 1.1 Text to Video 720p

Create expressive 720p text-to-video clips for rapid iteration, social content, and high-volume workflows.

720pFast

$0.14/sec

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I2VLive

720p

HappyHorse 1.1 Image to Video 720p

Animate still images to 720p with the same expressive direction at a lower per-second cost.

720pFast

$0.14/sec

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ReferenceLive

720p

HappyHorse 1.1 Reference to Video 720p

Iterate on reference-conditioned character scenes at 720p before committing to a premium-resolution render.

720pFast

$0.14/sec

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Video EditLive

720p

HappyHorse 1.1 Video Edit 720p

Test instruction-driven video edits at 720p for drafts and high-volume editing pipelines.

720pFast

$0.14/sec input

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What is the HappyHorse 1.1 API?

HappyHorse 1.1 is a generative video family for expressive motion and narrative scene building. Muapi exposes text-to-video, image-to-video, reference-to-video, and video-edit endpoints at 720p and 1080p.

The 1.1 release improves motion coherence, prompt adherence, and transitions over HappyHorse 1.0. Use 720p at $0.14 per second for economical iteration, or 1080p at $0.18 per second for final delivery; video editing is charged against the input duration.

HappyHorse 1.1 capabilities

Expressive text-to-video

Turn a scene description into a stylized video with character movement, camera direction, mood, and narrative pacing.

Image animation

Bring a supplied image to life with an optional motion prompt while keeping it as the visual starting point.

Reference consistency

Use 1–9 reference images to guide the character look, subject identity, or visual style across generated scenes.

Natural-language video editing

Describe wardrobe, prop, environment, or style changes for an existing MP4 or MOV clip, with optional reference images.

720p and 1080p tiers

Prototype at 720p for $0.14/sec or render premium 1080p output for $0.18/sec.

One asynchronous REST contract

Use the same API-key, request-ID, result-polling, and webhook lifecycle across every HappyHorse workflow.

HappyHorse 1.1 use cases

Narrative and short-form video

Create expressive character scenes, animated story beats, and cinematic social clips from concise shot descriptions.

Product and brand content

Animate product imagery, add branded visual direction, and iterate on campaign concepts without a full production setup.

Character-consistent worlds

Combine reference images with a motion prompt to explore recurring characters, environments, and visual identities.

Fast previsualization

Use the 720p tier to test prompts, camera moves, and edit instructions before producing final-resolution assets.

HappyHorse 1.1 variant comparison

Variant	Mode	Output	Price	Best For
HappyHorse 1.1 1080p	Text, image, reference, and video edit	1080p	$0.18/sec	Premium delivery and detail-sensitive work
HappyHorse 1.1 720p	Text, image, reference, and video edit	720p	$0.14/sec	Iteration, social content, and volume
Reference to Video	1–9 reference images + prompt	720p or 1080p	$0.14–$0.18/sec	Character and style consistency
Video Edit	Video URL + edit prompt	720p or 1080p	$0.14–$0.18/sec input	Instruction-driven revisions

HappyHorse 1.1 API examples

Submit any HappyHorse endpoint with the x-api-key header, save the returned request ID, and poll the standard prediction result endpoint for the generated MP4.

Create text-to-video

curl -X POST https://api.muapi.ai/api/v1/happy-horse-1.1-text-to-video-1080p \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"A fox runs through a bamboo forest at sunset, cinematic tracking shot","aspect_ratio":"16:9","duration":5}'

# Response: {"request_id":"REQUEST_ID"}

Start with the 1080p endpoint for premium output. Switch the model slug to the 720p variant for lower-cost iteration.

Animate an image

curl -X POST https://api.muapi.ai/api/v1/happy-horse-1.1-image-to-video-720p \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"images_list":["https://example.com/source.jpg"],"prompt":"A gentle breeze moves through the scene","aspect_ratio":"16:9","duration":5}'

# Use the 1080p endpoint when you need premium output.

Pass one source URL in images_list and use an optional prompt to describe the motion.

Use reference images

curl -X POST https://api.muapi.ai/api/v1/happy-horse-1.1-reference-to-video-1080p \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"The character walks through a neon market at night","images_list":["https://example.com/character.jpg"],"aspect_ratio":"16:9","duration":5}'

Provide 1–9 reference image URLs and a prompt describing the scene and movement.

Edit an existing video

curl -X POST https://api.muapi.ai/api/v1/happy-horse-1.1-video-edit-1080p \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"video_url":"https://example.com/source.mp4","prompt":"Change the background to a snowy mountain scene","audio_setting":"origin"}'

Send a video_url and a natural-language edit instruction; audio_setting can preserve the source audio.

Poll the result

curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \
  -H "x-api-key: YOUR_API_KEY"

# Read the generated video URL after status becomes completed.

Poll until status is completed, then read the generated video URL from the response.

HappyHorse 1.1 API FAQ

What does HappyHorse 1.1 support?

It supports text-to-video, image-to-video, reference-to-video, and natural-language video editing through separate 720p and 1080p endpoints.

How much does HappyHorse 1.1 cost?

The 720p variants cost $0.14 per second and the 1080p variants cost $0.18 per second. Video-edit pricing is calculated from the input video duration; a 5-second clip is $0.70 at 720p or $0.90 at 1080p.

What is the difference between 720p and 1080p?

Both tiers use the HappyHorse 1.1 workflow family. 1080p retains more detail for premium delivery, while 720p is the lower-cost choice for prototyping, social content, and high-volume generation.

How many reference images can I provide?

Reference-to-video accepts 1–9 reference image URLs. Use clean, consistent images and describe the intended movement and framing in the prompt.

Can I edit an existing video?

Yes. The video-edit endpoints accept an MP4 or MOV source URL, an edit instruction, and optional reference images. The current input limits allow 3–60 seconds and up to 100 MB.

What aspect ratios and durations are available?

Pass aspect_ratio and duration as separate request fields. The playground and endpoint schema show the currently supported options, including 16:9, 9:16, 1:1, 4:3, and 3:4.

How do I access the HappyHorse 1.1 API?

Create a Muapi API key, call the endpoint that matches your workflow, and poll the returned request ID or configure a webhook for completion.

Compare HappyHorse 1.0 →See the previous HappyHorse generation for compatibility and workflow comparison.Browse video models →Compare HappyHorse with other live text-to-video and image-to-video APIs.Create an API key →Start generating HappyHorse videos through Muapi.

Ready to build with HappyHorse 1.1?

Use one Muapi API key for expressive text, image, reference, and video-edit workflows.

Get an API Key Try HappyHorse 1.1