Modes and model IDs
| Mode | Model ID | Inputs & key parameters |
|---|---|---|
| Text-to-video (1.1) | happyhorse-1.1-t2v-uncensored | prompt; 480p/720p/1080p, 3–15 s, 9 aspect ratios incl. 4:5 · 5:4 · 21:9 · 9:21 |
| Image-to-video (1.1) | happyhorse-1.1-i2v-uncensored | 1 image + optional prompt; 3–15 s |
| Reference-to-video (1.1) | happyhorse-1.1-r2v-uncensored | 1–9 reference images + prompt → consistent subject |
| Video edit | happyhorse-videoedit-uncensored | 1 clip + up to 5 images + prompt; 720p/1080p |
| Text-to-video (1.0) | happyhorse-1.0-t2v-uncensored | previous generation, 720p/1080p — kept for existing integrations |
Every mode uses the same request shape: model + prompt + media arrays (images / videos / audios / files as public HTTPS URLs) + params. Full field tables: API docs.
Prices (USD, base list)
| Model | Variant | Price |
|---|---|---|
happyhorse-1.0-i2v-uncensored | 720p | $0.12913/s |
happyhorse-1.0-i2v-uncensored | 1080p | $0.22137/s |
happyhorse-1.0-r2v-uncensored | 720p | $0.12913/s |
happyhorse-1.0-r2v-uncensored | 1080p | $0.22137/s |
happyhorse-1.0-t2v-uncensored | 720p | $0.12913/s |
happyhorse-1.0-t2v-uncensored | 1080p | $0.22137/s |
happyhorse-1.1-i2v-uncensored | 480p | $0.04842/s |
happyhorse-1.1-i2v-uncensored | 720p | $0.09685/s |
happyhorse-1.1-i2v-uncensored | 1080p | $0.12452/s |
happyhorse-1.1-r2v-uncensored | 480p | $0.04842/s |
happyhorse-1.1-r2v-uncensored | 720p | $0.09685/s |
happyhorse-1.1-r2v-uncensored | 1080p | $0.12452/s |
happyhorse-1.1-t2v-uncensored | 480p | $0.04842/s |
happyhorse-1.1-t2v-uncensored | 720p | $0.09685/s |
happyhorse-1.1-t2v-uncensored | 1080p | $0.12452/s |
happyhorse-videoedit-uncensored | 720p | $0.12913/s |
happyhorse-videoedit-uncensored | 1080p | $0.22137/s |
Base list prices from the live price list (/pricing · pricing.json); the effective price for your key is returned by GET /ent/v2/prices. Cost is reserved at submit and settled on completion — failed tasks are refunded in full.
Example request
POST https://api.18models.ai/ent/v2/generate
Authorization: Bearer sk-…
Content-Type: application/json
Idempotency-Key: <stable-request-id>
{
"model": "happyhorse-1.1-t2v-uncensored",
"prompt": "Slow dolly-in on a woman in a red silk robe by a rain-streaked window, warm lamplight",
"params": { "resolution": "480p", "ratio": "9:16", "duration": 5 }
}
The response is HTTP 202 with a task_id; poll GET https://api.18models.ai/ent/v2/tasks/{task_id} (back off 2 s → 5 s) until status is success or failed, then read result_urls. Ready-made client code: docs → Build with AI or the Agent Skill.
What is allowed
NSFW output is permitted under the 18models Content Policy: fictional adult content, including explicit sexual content, is allowed; content involving minors (in any style) or real, identifiable people is prohibited absolutely and screened on both input and output. Upstream providers apply their own checks in addition to ours — a task rejected upstream fails and is refunded automatically.
- HappyHorse is an Alibaba (Tongyi Lab) video model. Other hosts list it without an NSFW-permitted variant and without a 480p tier (WaveSpeed: from $0.70 per run, verified 2026-08-19); 18models serves it with NSFW output permitted from $0.048/s at 480p.
- Fictional adults only. Reference images of real people are prohibited for NSFW generation and screened on input.
FAQ
What is HappyHorse?
A video model family from Alibaba's Tongyi Lab (versions 1.0 and 1.1) offering text-to-video, image-to-video, reference-to-video and video edit. Other hosts list it without an NSFW-permitted variant and without a 480p tier (WaveSpeed: from $0.70 per run, verified 2026-08-19); 18models serves it with NSFW output permitted under a published content policy from $0.048 per second at 480p.
How much does HappyHorse cost per second?
$0.048 per second at 480p, $0.097 at 720p and $0.125 at 1080p (version 1.1). A 5-second 480p clip is about $0.24; $5 of credit covers roughly 100 seconds of 480p video.
What aspect ratios and durations does HappyHorse support?
16:9, 9:16, 1:1, 4:3, 3:4, 4:5, 5:4, 21:9 and 9:21; clips from 3 to 15 seconds. Reference-to-video accepts 1–9 reference images.
Is HappyHorse cheaper than Wan 2.7 for NSFW video?
Yes at every resolution: 480p $0.048/s (Wan 2.7 has no 480p tier), 720p $0.097/s vs $0.113/s, 1080p $0.125/s vs $0.169/s. Wan 2.7 offers more modes (storyboard, video edit variants) and 2-second minimum clips.
Related
- Wan 2.7 video (more modes)
- API for AI companion apps
- 18models vs Novita
- All models & prices
- Pricing
- API docs
- Content Policy