H3 vs Wan 2.2 vs LTX-2.5: Which Fits Your GPU

Updated 2026-09 · Specs and VRAM figures from official docs and community benchmarks

In 2026, local video generation comes down to three open options: MiniMax H3 (joint audio-video generation, 15 s), Wan 2.2 (Alibaba Tongyi, the most mature ecosystem), and LTX-2.5 (extremely fast + native audio). They are not replacements for one another — they are three different trade-offs. Here's the verdict first:

Model	Params	Local VRAM	Max duration	Native audio	License	Speed feel
MiniMax H3	33.1B	8GB minimum / 16GB usable / 32GB comfortable	15 s	✅ Stereo	Community license (with region and revenue clauses)	Slow (5090 768p 5s 4-step ~80 s)
Wan 2.2 TI2V-5B	5B	8GB (GGUF) / 16GB comfortable	~5 s	❌ Needs separate audio	Apache 2.0 (most worry-free for commercial use)	Medium (4090 480p 5s ~4–6 min)
Wan 2.2 A14B	27B (14B active)	12GB (GGUF offload) / 40GB+ full quality	~5 s	❌	Apache 2.0	Slow (best-quality tier)
LTX-2.5	22B	12GB (distilled/quantized) / 32GB+ full quality	~10 s	✅ Generated jointly in one pass	Open weights (check official terms for commercial use; tiered)	Very fast (distilled version close to real-time)

How to choose by GPU tier

8GB VRAM: start with the GGUF-quantized Wan 2.2 TI2V-5B (Q4 is ~3GB of weights, leaving plenty of room for activations); LTX-2.5's distilled/quantized version is worth a try; H3 only runs via GGUF Q3 + heavy offloading — it works but is slow (540p short clips from 5–6 minutes up).
12–16GB VRAM: H3 enters "usable" territory — with pruned INT8 + 4-step acceleration, 540p–768p short clips render steadily; LTX-2.5 distilled is the most comfortable combo; Wan 5B runs at full precision.
24GB VRAM: H3 is comfortable (768p, 8 steps, full duration); LTX-2.5 can go FP8; Wan A14B also runs with GGUF/FP8.
32GB+ VRAM: H3 at full power (on a 32GB card, 768p 8-step measured ~5.5 s per step); LTX-2.5 at full quality; Wan A14B at full precision.

The VRAM figures are the total of "model weights + activations + cache", not file size. To find out what your specific setup can run, use the WhichH3 calculator directly: choose your GPU, RAM, and page file, and it will give you VRAM usage and estimated time for every "resolution × duration" combination.

How to choose by need

What matters most to you	Recommendation	Why
Characters talking, with sound effects generated in sync with the picture	H3 or LTX-2.5	Both do native joint audio-video generation; Wan 2.2 needs a dubbing or lip-sync pass
A complete 10–15 s narrative clip	H3	15 s is the longest of the open models; LTX is ~10 s; Wan is ~5 s
Fast iteration and lots of drafts	LTX-2.5 distilled	Distillation plus near real-time speed on a single card — the fastest of the three
The most worry-free commercial license	Wan 2.2	Apache 2.0; H3 and LTX have their own terms (H3 also adds region restrictions)
Ecosystem and number of LoRAs	Wan 2.2	Out for over a year, with the richest training toolchain and community LoRAs; H3's ecosystem is filling in fast
Ceiling on image quality and detail	H3 (768p) and Wan A14B	Both are top-tier in their resolution class; LTX's strength is speed, not detail

An intuitive time-cost comparison (on the same 5090)

H3: 768p / 5 s / 4-step distillation ≈ 40–60 s sampling, ~80 s end-to-end;
Wan 2.2 5B: 480p / 5 s ≈ 4–6 minutes (official and community figures);
LTX-2.5 distilled: officially close to real-time on a single card (seconds to low tens of seconds).

Note that "fast" comes in two flavors: LTX is fast thanks to architecture and distillation; H3's 4-step acceleration LoRA can also cut 20 steps to 4 (about 4×), but the base is different. If you mainly make short clips where audio must stay in sync, the speed gap between H3 and LTX can be leveled out by your workflow (draft resolution).

One-line summary

Just an older 8–12GB card: Wan 2.2 5B as your baseline, LTX-2.5 distilled to try out;
16GB or more, want audio-video sync + long clips: H3 (paired with 4–8 step distillation);
Chasing iteration speed for storyboard experiments: LTX-2.5 distilled;
Commercial delivery with permissive licensing: Wan 2.2.

Related pages: RTX 4070 12GB details · RTX 5090 32GB details · Pruned INT8 — compatible GPUs