TL;DR
- Need 1080P, 12 durations, and a free audio switch? Use LTX 2.5 Fast image-to-video (
ltx-2.5-fast/image-to-video, $0.043/s at 720p, $0.086 at 1080P). Need cheaper silent 720p with aspect-follows-image? Use Wan 2.6 Flash (wan2.6-flash/image-to-video, silent 720p at $0.029/s). - The hardest number: silent 720p is $0.043 versus $0.029 per second (Wan 33% cheaper); silent 1080P is $0.086 versus $0.043 (Wan half price).
- Both are live: the LTX i2v page and the Wan 2.6 Flash page, one shared
/v1/tasks, 200 free credits on signup.
At a glance
LTX 2.5 Fast i2v (ltx-2.5-fast/image-to-video) | Wan 2.6 Flash (wan2.6-flash/image-to-video) | |
|---|---|---|
| 720p silent | $0.043/s | $0.029/s |
| 720p audio | same (free switch) | $0.0575/s |
| 1080P silent | $0.086/s | $0.043/s |
| 1080P audio | same | $0.086/s |
| Durations | 12 enumerated (2–20 s) | 5 / 10 / 15 s only |
| Aspect | aspect_ratio 16:9 / 9:16 | follows the input image |
| First + last frame | yes (two URLs) | no (exactly one) |
| Input field | image_urls array (1–2) | image_urls array (exactly 1) |
| Best for | Frame transitions, custom aspect, audio control | Vertical social assets, cheap silent volume |
HiAPI current prices, checked October 23, 2026. Pay for successful clips; failures refund.
Same input image, same prompt, real clips
Pair A: red fox in an autumn forest (16:9 input)
The fox stands up, shakes off leaves and trots across the clearing, leaves crunching, birds singing in the forest
| LTX 1080P audio $0.43 (5 s) | Wan 720p audio $0.2875 (5 s) |
|---|---|
| LTX fox 1080P → | Wan fox 720p → |
Left: ltx-2.5-fast/image-to-video, 1080p, 5 s, 16:9, $0.43, audio. Right: wan2.6-flash/image-to-video, 720p, 5 s, $0.2875 (Sound On). Same input and prompt, one render each — resolution and price differ as stated.
Pair B: desert convertible (16:9 input)
The camera slowly dollies around the turquoise convertible as the sun sinks behind the mesas, dust drifting in the warm light
| LTX 1080P silent $0.43 (5 s) | Wan 1080P silent $0.215 (5 s) |
|---|---|
| LTX convertible 1080P → | Wan convertible 1080P → |
Left: ltx-2.5-fast/image-to-video, 1080p, 5 s, 16:9, $0.43, silent (generate_audio: false). Right: wan2.6-flash/image-to-video, 1080P, 5 s, 1918×1080, $0.215, silent. Same input and prompt, one render each — at silent 1080P, Wan is half price.
What you can see:
- Fox pair: both complete the "stand up → shake → trot" chain; LTX renders at 1080P with sharper detail, at a higher price.
- Convertible pair: both orbit silently at 1080P — Wan $0.215 versus LTX $0.43 shows the silent-scenario gap directly.
Choosing by scenario
- Vertical social assets (aspect follows the photo): Wan — no aspect parameter, portrait in gives portrait out.
- First-to-last frame transitions (day → night): LTX — two URLs; Wan takes exactly one.
- Silent volume output: Wan is cheaper — silent 720p at $0.029/s, below LTX's $0.043/s.
- Durations beyond 5 s steps (3 s, 8 s, 20 s): only LTX; Wan offers 5/10/15.
- Audio without paying extra: LTX (free switch); Wan doubles the 720p rate with sound on ($0.0575/s).
- 1080P with audio ties: both at $0.086/s.
Switching cost: nearly identical fields
{
"model": "ltx-2.5-fast/image-to-video",
"input": {
"prompt": "The fox stands up, shakes off leaves and trots across the clearing, leaves crunching, birds singing in the forest",
"image_urls": ["https://example.com/first-frame.jpg"],
"resolution": "720p",
"duration": 5,
"aspect_ratio": "16:9",
"generate_audio": true
}
}
{
"model": "wan2.6-flash/image-to-video",
"input": {
"prompt": "The fox stands up, shakes off leaves and trots across the clearing, leaves crunching, birds singing in the forest",
"image_urls": ["https://example.com/first-frame.jpg"],
"duration": 5,
"resolution": "720p",
"audio": true
}
}
Differences: LTX adds aspect_ratio and generate_audio; Wan uses a billable audio field and has no aspect parameter; duration ranges differ.
FAQ
- Yes, Wan wins silent 720p: $0.029 versus $0.043 — 33% less.
- Yes, Wan halves silent 1080P: $0.043 versus $0.086.
- Yes, only LTX takes first + last frames (two URLs); Wan takes exactly one.
- Yes, audio bills differently: free on LTX, tiered on Wan (720p audio $0.0575/s).
- Yes, both refund failures.
Next: animate one of your product shots on both LTX and Wan 2.6 Flash and see which treatment fits; full pricing is in the LTX pricing page and the Wan pricing page.
