LTX 2.3 vs Seedance 2.0: Speed, Quality, and API Access Compared

The LTX 2.3 vs Seedance 2.0 question doesn't have a single winner, because the two models optimize for different things. LTX 2.3 (Lightricks) is built for speed and open weights. Seedance 2.0 (ByteDance) is built for reference-driven consistency — keeping the same character and continuity across shots. This comparison lays out where each one actually leads, across speed, quality, and API access.Key Takeaways

• Speed: LTX 2.3 is the faster model. Its distilled checkpoints run in real time on an H100 (HD in ~10 seconds), while Seedance's "Fast" tier lowers cost, not latency.
• Quality: On Siray, LTX 2.3 outputs up to 1080p at 24–30 FPS in clips up to 20 seconds; Seedance 2.0 tops out at 720p / ~15 seconds. Seedance's real edge is reference-to-video identity control, not raw resolution.
• API access: LTX 2.3 has open weights (self-hostable) and cheaper per-second rates; Seedance 2.0 is closed, API-only. Both run on Siray under one API key.

Speed

LTX 2.3 is the clear speed pick. Lightricks ships distilled checkpoints that run in real time on an H100; the Lightricks repo reports HD output in about 10 seconds and a low-resolution preview in around 3 seconds. That makes it a practical fit for iterative work, where a result appears before committing to a full render.Seedance 2.0 offers a "Fast" variant, but that tier is about lowering per-second cost, not hitting real-time latency. It's quick enough for batch generation, just not built around the same near-instant preview loop. One honest caveat: no single public benchmark runs both models on identical hardware, so it's fair to say LTX is built for real-time and Seedance Fast trades latency for cost — but not to quote a precise "X times faster" figure.

Quality

On Siray's hosted endpoint, LTX 2.3 outputs up to 1080p at 24–30 FPS, with clips up to 20 seconds — a modest resolution edge over Seedance's 720p ceiling, not a 4K gap. (The open LTX weights go higher — up to 4K and 50 FPS with native audio — if you self-host them, but that's outside Siray's hosted endpoint, which serves 1080p text-to-video and image-to-video.)Seedance 2.0, as hosted, tops out at 720p and roughly 15 seconds — despite the marketing noise, the fal/Siray-hosted Seedance 2.0 does not do native 4K. Where Seedance actually wins is control: its reference-to-video mode anchors a character's identity across shots using up to 9 image, 3 video, and 3 audio references. Testing and reviews — including Siray's own look at why Seedance's reference-to-video beats its text-to-video — converge on the same point: Seedance's pure text-to-video drifts, but its reference-driven generation holds continuity better than most. So the quality question isn't "which is sharper," it's "do you need slightly higher resolution and faster iteration, or repeatable characters."

The Spec Table

API Access & Pricing

This is where the models diverge most. LTX 2.3 ships open weights under Apache-2.0, so it can be self-hosted, run locally, or reached through fal.ai, Replicate, or Siray. Its per-second pricing is also lower: fal.ai lists LTX 2.3 at roughly $0.06–0.08/s for 1080p (fal's own page shows both figures), climbing with resolution.Seedance 2.0 is closed: API-only, no self-host. On fal.ai, Seedance 2.0 Fast image-to-video at 720p runs $0.2419/s. On Siray the same model is $0.147/s, about 39% lower than fal's rate. The practical upside of running both through Siray is that swapping between them is a one-line change: same API key, same request shape, switch the model field. Full schemas are in the Siray docs.

Which Should You Use

Reach for LTX 2.3 when you want speed or an open pipeline you can self-host — real-time iteration at up to 1080p on Siray, plus open (Apache-2.0) weights that reach higher resolutions when run locally. Reach for Seedance 2.0 when repeatable characters matter more than pixel count — its reference-to-video mode is the stronger tool for consistent identity across shots. And because both sit behind one Siray API key, you don't have to commit to either up front; test each on the same job and keep the one that fits.

FAQ

Which is faster, LTX 2.3 or Seedance 2.0? LTX 2.3 — its distilled checkpoints run in real time on an H100. Seedance's Fast tier optimizes cost, not latency.Does Seedance 2.0 generate native 4K? No. As hosted on fal.ai and Siray, Seedance 2.0 tops out at 720p.Can I self-host either model? LTX 2.3, yes — its weights are open under Apache-2.0. Seedance 2.0, no — it's closed and API-only.Create your free Siray account and run both LTX 2.3 and Seedance 2.0 with one API key.