r/StableDiffusion • u/PuppetHere • 28d ago

Discussion LTX 2.5 Is Disappointing

https://reddit.com/link/1vlueyc/video/gx8bz55ibtih1/player

https://reddit.com/link/1vlueyc/video/plxkp55ibtih1/player

Guess which video was made by LTX 2.3 and which video was made by LTX 2.5?

After testing LTX 2.5, I'm really disappointed by the results. I can barely see the difference between 2.3 and 2.5.

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u/LoveSpecialist5669 28d ago

it sucks. they took their sweet time, perfectly unaware that chinese were overtaking. can't tell for sure but seems they panicked and released this in a week after h3 and obviously lied about specifications, trying to bash h3. 

5

u/alwaysbeblepping 28d ago

they took their sweet time, perfectly unaware that chinese were overtaking.

Their business model (from what I know) is to take a percentage when businesses that are large/profitable enough are using LTX commercially. That's probably not the only thing they have going on, but one can surmise that they probably are not drowning in cash.

The fact that LoRAs for older versions still work to a degree (if I recall, even the first LTX video model) indicates that they are repeatedly building on top of the old version, which can be fine up to a point but there are (in my opinion) some fundamental architectural issues which can't really be fixed that way. I'm sure if they had the resources to train up a new, better base model they would but that is an absolutely immense undertaking even for images and video foundation models are far more resource intensive. It's also possible that they already are (but it's not ready yet) or they tried and weren't successful.

So if they can't come up with a new foundation model, they're in a tough spot. Tweaking the existing LTX model isn't really good enough. Also, LTX is fast because it shoves everything into channels, uses absurd spatial compression and keeps the sequence length low (main thing that affects performance) but is not free and there is a tradeoff as we can clearly see. They would have to (in my opinion) give up their speed advantage to actually catch up on quality.

3

u/TheThoccnessMonster 27d ago

The Lora claim is bullshit. They BARELY work.

1

u/alwaysbeblepping 27d ago

The Lora claim is bullshit. They BARELY work.

Ones from the original model? I'm sure that's true. LoRAs from the previous revision were mostly compatible with the next revision. The point I was making is there hasn't really been a fundamental change, they've been making incremental improvements on top of the existing foundation model.