Pick FLUX 3 Max for 20-second takes, eight aspect ratios and keyframes placed by frame number; pick Kling 3.0 Omni for 4K, reusable subjects and multi-shot output.
FLUX 3 Max is live on HiAPI. Open the model page, type a prompt and generate; new accounts get 200 free credits. Both clips below come from the same prompt, one generation each, so you can open them and compare.
FLUX 3 Max vs Kling 3.0 Omni at a glance
| FLUX 3 Max | Kling 3.0 Omni | |
|---|---|---|
| Duration | 5–20s, default 5 | 3–15s, default 5 |
| Ratios | 8: auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16 | 3: 16:9, 9:16, 1:1 |
| Max res | 1080p | 4K |
| Audio | generate_audio on | audio off |
| Keyframes | Keyframes: 1–10 images by frame number (keyframes-to-video entry) | No keyframes; elements reuses up to 7 subjects |
| Multi-shot | No | prefer_multi_shots, off by default |
| Per sec | 720p $0.0608 / 1080p $0.1036 | 720p $0.10 silent / $0.129 with audio; 1080p $0.129 / $0.1645; 4K $0.479 |
| 5-s clip | $0.304 (720p) | $0.50 (720p silent) / $0.645 (720p with audio) |
At 720p with audio, FLUX 3 Max runs $0.0608 per second and Kling 3.0 Omni $0.129, about 53% lower. Every price here is the HiAPI rate, billed per second of output; failed tasks are not billed, audio adds nothing to a FLUX 3 Max clip, and text-to-video, image-to-video and keyframes-to-video all share one rate. $10 buys about 32 five-second clips at 720p, and one five-second 720p clip costs $0.304, or 608 credits. Run your first clip on the model page →
What do the two models make from the same prompt?
Both tests use identical prompts at five seconds, 720p, 16:9, with audio on, one generation each.
Test A: rain-soaked Tokyo alley at night
| FLUX 3 Max | Kling 3.0 Omni |
|---|---|
 Watch the clip → · Generate with this prompt → |  Watch the clip → · Generate with this prompt → |
Prompt (same text on both sides, generated once each)
A slow push-in down a rain-soaked Tokyo alley at night; neon signs reflect in puddles, steam rises from a vent, a cyclist crosses the frame in the distance; shallow depth of field, cinematic, no cuts.
Same prompt, five seconds, 720p, 16:9, audio on, one generation each.
FLUX 3 Max moves the camera closer into the alley, packs in more signs, gives the neon more saturation, fills more of the frame with puddle reflections, shows a more visible steam column, and leans purple-warm overall. Kling 3.0 Omni sets a lower and wider camera, shows fewer signs, keeps the palette cool and neutral, gives the puddle reflection a clear shape in a smaller area, and renders the brick joints and drainage channel on the road more distinctly.
Test B: ceramic coffee cup in morning light
| FLUX 3 Max | Kling 3.0 Omni |
|---|---|
 Watch the clip → · Generate with this prompt → |  Watch the clip → · Generate with this prompt → |
Prompt B (same text on both sides, generated once each)
Close-up of a ceramic coffee cup on a wooden table as morning sunlight sweeps across the rim; steam curls upward and drifts, the camera slides slowly sideways, warm highlights move over the glaze; shallow depth of field, no cuts.
Same prompt, five seconds, 720p, 16:9, audio on, one generation each.
FLUX 3 Max frames wider, keeps both cup and saucer in shot, shows the window frame and blurred greenery outside, cuts a band of warm sunlight across the table, and renders steam as a thin line. Kling 3.0 Omni frames tighter, gives the cup body more of the frame, shows the crackle glaze clearly, produces a bigger cloud of steam, and keeps the background darker.
Which one should you use?
- 20-second single takes and long camera moves → FLUX 3 Max
- 21:9, 2:1, 4:3, 1:1 or 3:4 framing → FLUX 3 Max
- Keyframes placed precisely by frame number (1–10 images) → FLUX 3 Max
- Audio on by default without extra parameters → FLUX 3 Max
- 4K delivery → Kling 3.0 Omni
- One subject reused across shots (
elements, up to 7) → Kling 3.0 Omni - Automatic shot splitting from one prompt (
prefer_multi_shots) → Kling 3.0 Omni - Vertical 9:16, up to 15 seconds, with sound → either model; at 720p with audio FLUX 3 Max is about 53% lower
How hard is it to switch between them?
Not hard. Both models use the same async endpoint, POST https://api.hiapi.ai/v1/tasks, with the same API key. Both return a taskId, and the result lands in data.output[0].url. Switching touches model and a few input fields:
model: swapflux-3-max/text-to-videoforkling-3.0-omni/text-to-video.- Audio: FLUX 3 Max uses
generate_audio(defaulttrue); Kling 3.0 Omni usesaudio(defaultfalse), so writetruewhen you want sound. - Aspect ratio: FLUX 3 Max exposes 8 values and accepts
auto; Kling 3.0 Omni exposes 3 (16:9, 9:16, 1:1) and defaults to 16:9. - Duration and resolution: FLUX 3 Max covers 5–20 seconds at 720p or 1080p; Kling 3.0 Omni covers 3–15 seconds at 720p, 1080p or 4K.
- Kling 3.0 Omni adds
elementsandprefer_multi_shots; FLUX 3 Max addsreasoning_leveland keyframes inkeyframes[].
prompt works the same way on both. Full request examples are in the FLUX 3 Max API guide.
FAQ
Can FLUX 3 Max output 4K?
No. It tops out at 1080p. For 4K, use Kling 3.0 Omni with resolution set to 4k at $0.479 per second.
Can both models share one API key and endpoint?
Yes. Both run on POST https://api.hiapi.ai/v1/tasks, return a taskId, and need only a new model plus the matching input fields.
Can Kling 3.0 Omni generate a 20-second take?
No. Its duration range is 3–15 seconds. For 20 seconds, use FLUX 3 Max with duration set to 20.
Does Kling 3.0 Omni generate audio by default?
No. audio defaults to false; set it to true explicitly. FLUX 3 Max has generate_audio on by default.
Want to see a clip first? Hit "Watch the clip" above, or open the FLUX 3 Max model page and run a five-second 720p clip from a prefilled prompt for $0.304.
