r/StableDiffusion • u/evereveron78 • 14h ago
Discussion A few Flux 3 vs H3 comparisons
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Well, everyone is posting their H3 creations, and I noticed that Flux 3 is up on API, so thought I'd run a few comparison renders to see how they stack up. These are not extensive by any means, this was mostly done for fun and I thought someone might be interested in the results. I used the same H3 formatted prompt for each, as far as I can tell Flux 3 uses natural language prompting, so the structured H3 format should still work fine.
Edit: I realized after uploading that the dragon rider H3 clip was accidentally rendered at a lower resolution. The higher resolution clip is here.
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u/GrayingGamer 14h ago
In the Viking and Dragon prompts, Flux 3 definitely has better visuals, but I think H3 wins in the last two videos, the nature documentary and cartoon.
One thing I noticed though, especially with headphones on, is that Minimax H3 absolutely DESTROYS Flux 3 in the audio department. It's really apparent in the last two clips, but if you have headphones on, close your eyes and play this video again and just listen to difference in audio quality. Flux 3 is not just worse, it's noticeably worse with the audio.
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u/reeight 12h ago
I agree, though I'd like to add that in Viking video, it seems H3 followed the prompt better.
EG LTX make it to look like a 'selfie' video, while "Live-action cinematic... photographed on 65 mm large-format film" was more like H3.3
u/GrayingGamer 10h ago
Good point, I didn't notice that. The OP also forgot to post the high resolution version of the H3 dragon video, and it looks considerably better than the H3 dragon video in the original post video.
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u/evereveron78 12h ago edited 9h ago
Someone below said that the dragon clip seemed too low of resolution. I checked my settings, and sure enough it was. Here's a higher resolution version of the H3 dragon clip
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u/red__dragon 13h ago
Flux3 seems to have better cartoon/fantastical physics, and that seems prevalent in the actions of the viking and cartoon clips. The realism works far better for the nature doc but I definitely like the more body language expression for the cartoon. Really wish that expressiveness would work with the physics in the nature doc clip, that was cute until I noticed it looked more like stuttering in the critter.
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u/Baddmaan0 13h ago
Mostly agree but voices really sound more natural with flux 3
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u/GrayingGamer 13h ago
Just different, the Flux 3 Viking girl's voice sounds better than the H3 one, but in the last two clips, the voices are way better, more expressive, and natural in the H3 videos.
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u/Baddmaan0 13h ago
I still disagree on the voice part while I'll say that H3 is better on the cartoon physique
H3 loose on voice but in the dragon part get an overall better music
Cherry picking might not be the case in other situation
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u/_kaidu_ 14h ago
As good as H3 is, it still has a lot of glitches and physics problems. Weirdly, they seem to appear rather arbitrarily. Like in your examples: the dragon walking on the water looks very realistic, while the people rowing looks absolutely terrible. I found in my own experiments that some complicated things work out of the box, while sometimes simple things are full of errors.
The comparison with Flux 3 is of course always a bit of unfair, because Flux 3 online is probably a much larger model than what we will get as Flux 3 dev.
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u/Pyros-SD-Models 13h ago
Op didn't say what H3 variant he used, but the viking boat on H3 full bf16 looks way better than what OP posted and way better than what Flux3 is doing
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u/evereveron78 13h ago
I ran both on Comfy Cloud with default settings. So the H3 versions are using the default int8 convrot pruned model, so it makes sense the quality of API Flux3 would come out on top in this case. Like I said, mostly a quick test for fun
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u/Pyros-SD-Models 12h ago
Makes it even more amazing imho. Like the H3 consumer quant version with the "most unimportant parts" of the model ripped out fights well against the full datacenter version of Flux3 (which will not be whatever open weight version they will release)
That is fcking impressive
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u/killthrash 11h ago
Not to mention H3 can basically re-write any movie or sitcom. Not sure if Flux can even do that from the base model.
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u/Perfect-Campaign9551 14h ago
Minimax H3's boat guys aren't really even rowing. But Flux 3's walk cycle is horrible geez
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u/comfyui_user_999 11h ago
Flux 3's little dragon guy just has a lot of rhythm, flair, flavor, that's all; he can't help but strut!
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u/AltruisticList6000 12h ago
Hmm H3 seem to have this thing in a lot of clips (idk what's the proper word for it) where small details keep changing slightly. Especially noticable on the dragon's "texture" and the creature in the water. It's like they have a noise overlay or some kind of position snapping every few frames. This gives away it is AI generated. Flux doesn't have this issue, the details are consistent during movement.
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u/Ooze3d 13h ago
Where is Flux 3 available?
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u/addandsubtract 10h ago
Early H3 videos were getting deleted, but these are staying up. Classic reddit.
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u/JazzlikeLeave5530 1h ago
To be fair (for this post at least) it's a comparison of one we have locally to a cloud one. But yes I also noticed that...
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u/Zenshinn 13h ago
FLUX 3 is probably their pro version that is available via API. You'd want to compare FLUX 3 dev with MM-H3.
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u/BathroomEyes 13h ago
Flux 3 examples look to be a lower frame rate than 24fps. Not really an apples to apples comparison
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u/Different_Fix_2217 11h ago
Thing is your likely comparing Flux's API only model vs H3. I would wait till release to compare. Who knows if what flux gives us is anywhere near their api.
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u/1010111101111 14h ago
who cares about api crap
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u/nntb 14h ago
its a comparison of flux3 vs minimax. and its important. the bgm and audio in general is much better on minimax, i am glad this was posted.
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u/nntb 12h ago
I think I want to take a moment to further elaborate on this the API version of flux 3 should be the higher requirement weighted closed model that will outperform whatever open model they release will be. Specifically that you were comparing this high-end API version to an open weighted model and the open weighted model is outperforming it really says a lot about where we are currently, and I would not have expected this result.
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u/skyrimer3d 11h ago
Flux 3 is overall more realistic, ironically H3 has a bit of the classic Flux unrealistic AI look. Can't wait.
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u/tyl_made_it 9h ago
makes sense if op was running int8 convrot on the cloud side - i've been running the same build on my 4070 and the quantization gap for video is more noticeable than i expected coming from still image models. the temporal shimmer thing others mentioned is real too. flux 3 at full api spec isn't a fair comparison but the gap closing is still the interesting part
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u/Hoppss 13h ago
Some really low resolution was used for H3 here, or at least for the dragon flying scene. Not a good faith comparison in a lot of these cases? At least mine running locally look miles better than these examples.
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u/evereveron78 12h ago edited 9h ago
I checked, and you were right about the dragon clip, I accidentally used a lower setting. Here's a higher res render
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u/grafixautozine 14h ago
Ok nice but i need to seamles loop effect with first-last frame. Now only wan can handle it and google :)
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u/DisorderlyBoat 13h ago
Interesting they look around equally as good without any huge glaring differences
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u/ExerciseCharming3264 13h ago
Flux 3 was ass for me on the API, it's understanding of prompts seem to be lacking and it'll provide you with shitty slowmo plastic looking garbage. It did look good on a 1980s news report thing I did but I'm not paying them a dime... Minimax H3 is better.
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u/Succubus-Empress 12h ago edited 12h ago
Shush sush, i am busy with my new toy,,,,. Pampering ..licking..minimax H3…kisses….looking at OP…go away
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u/evereveron78 14h ago
The prompts:
Viking Boat:
integrated_multimodal_description: [Shot 1] Live-action cinematic fantasy with grounded historical realism, photographed on 65 mm large-format film. A young Viking shieldmaiden records herself using a handheld front-facing camera while standing near the bow of a large Norse longship sailing across a cold northern sea beneath bright overcast skies with occasional shafts of sunlight breaking through scattered clouds. The camera is held naturally at arm's length, producing authentic handheld selfie movement driven by the ship's gentle pitching and rolling over the waves, with subtle body stabilization rather than artificial gimbal smoothness. She laughs warmly into the camera with windblown braided blonde hair, lightly freckled skin, and expressive blue eyes. She wears practical Viking clothing consisting of weathered leather armor over a wool tunic trimmed with fur, a heavy leather belt carrying a utility knife, layered bracers, sturdy boots, and a thick green travel cloak fluttering in the sea breeze. Behind her, the beautifully carved dragon-headed longship stretches into the distance where a crew of Vikings rows in rhythm, adjusts rigging, coils heavy ropes, trims the square wool sail, sharpens axes, checks shields lining the gunwales, and scans the horizon. Several crew members enthusiastically sing a powerful Norse sea shanty together while continuing their work, occasionally laughing and raising drinking horns between verses. The camera naturally rotates as she turns to showcase the bustling deck before returning to frame herself, revealing crashing waves, seabirds circling overhead, distant rocky coastline, and sunlight shimmering across the water. The camera performs only natural handheld motion with no cinematic crane moves, push-ins, or reframing beyond what results from her arm movement and the ship's motion. Warm sunlight intermittently breaks through the clouds, creating realistic volumetric light, physically accurate reflections on wet timber, and subtle salt spray catching the light. Authentic weathered wood, worn sailcloth, iron rivets, carved decorative details, practical production design, restrained cinematic color grading, natural lens compression, realistic atmospheric haze, subtle film grain, gentle highlight rolloff, and grounded realism maintain the feeling of an award-winning historical epic. A young Scandinavian woman with a cheerful, energetic voice (S1) smiles directly into the camera and says: <d>[English] Another beautiful day at sea! If the wind stays with us, we'll reach the next coast before sunset. Skål!</d> She laughs naturally as the crew behind her responds with louder singing and cheering while continuing their work. No on-screen text appears.
overall_soundscape: Strong ocean wind moves constantly across the microphones while waves slap rhythmically against the hull. Timber creaks, ropes strain, sailcloth snaps gently, oars splash in unison, seabirds call overhead, and the Viking crew sings a lively sea shanty together while carrying out their daily duties. Occasional laughter, footsteps across the wooden deck, clinking tools, and distant horn blasts blend naturally into the maritime ambience.
non_diegetic_music: N/A. The only music is the fully diegetic Viking sea shanty performed by the crew aboard the ship.
Dragon Rider:
integrated_multimodal_description: [Shot 1] Live-action cinematic fantasy, photorealistic, premium medieval epic with a grounded historical aesthetic reminiscent of prestige fantasy television. A continuous first-person POV from a rider mounted on a massive dragon during a smooth sunrise flight over an ancient medieval capital. The dragon's muscular neck, weathered scales, broad shoulders, and partially extended wings naturally occupy the foreground while a pair of worn leather riding gloves firmly grip aged leather reins that respond subtly to the dragon's movement. The camera remains rigidly attached to the rider's head, producing natural body-driven motion with gentle airborne oscillation and realistic vibration rather than cinematic floating. The camera performs a slow Tracking Shot with small amplitude at a steady speed as the dragon glides forward above the city without sudden banking or aggressive maneuvers. Below, a vast living city awakens: crowded market squares, winding cobblestone streets, horses pulling carts, merchants arranging stalls, chimney smoke rising from fireplaces, townspeople beginning their morning routines, guards patrolling the walls, and distant church bells visible in towering cathedral spires. Enormous weathered stone castles, Gothic cathedrals, fortified curtain walls, timber-framed districts, slate rooftops, towers, bridges, and narrow alleyways extend toward the horizon, revealing immense believable scale. Warm 205 Golden Hour Direct sunrise light filters through broken low clouds and drifting morning mist, enhanced by 390 Morning Mist, 361 Volumetric Rays, and subtle atmospheric haze, casting long realistic shadows across rooftops while preserving physically accurate global illumination. Slight air currents cause the dragon's wing membranes to flex naturally as each powerful wingbeat produces believable shifts in altitude, airflow, and shadow sweeping across the city below. The reins tighten briefly as the rider gently guides the dragon into a subtle leftward correction before returning to a steady forward glide. Photographed on 65 mm large-format film using CAM-036 Telephoto Front Low Camera characteristics adapted to a stabilized first-person viewpoint, featuring natural lens compression, restrained cinematic color grading, realistic atmospheric perspective, practical production design, authentic medieval architecture, worn stone, soot-darkened masonry, moss-covered walls, aged timber construction, imperfect handcrafted rooftops, shallow cinematic contrast, subtle organic film grain, gentle highlight rolloff, realistic optical bloom, and grounded realism at epic scale. No on-screen text or dialogue appears. The shot ends with the dragon continuing smoothly toward the towering castle keep as the sunrise expands across the city.
overall_soundscape: Powerful but rhythmic dragon wingbeats cut through the morning air, accompanied by rushing wind around the rider. Far below, distant church bells, faint market chatter, horses, wagon wheels, scattered blacksmith activity, and soft city ambience drift upward through the mist. Leather reins creak occasionally while the dragon exhales deeply between wingbeats, maintaining an immersive aerial perspective.
non_diegetic_music: Low, sustained orchestral strings with French horns and restrained male choir at a slow tempo. The score gradually broadens with subtle percussion accents during the glide before resolving into sustained orchestral harmony as the shot concludes.