AI Video Upscalers Compared: ByteDance, SeedVR2, FlashVSR, Veo 3.1, Crystal (2026)
Last updated August 7, 2026
AI video upscalers have specialized: ByteDance's engine (aigc preset, gated Pro tier) is the default for taking AI clips to 4K; SeedVR2 (ICLR 2026, Apache 2.0 3B weights) leads open restoration of degraded footage; FlashVSR is the near-real-time cost floor; PixVerse and Veo 3.1 upscale their own ecosystems' output; Crystal preserves faces at a premium. All callable inside invideo.
Updated August 2026
No single AI video upscaler wins every job in 2026 — the category has split into specialists, and the real skill is routing between them. An upscaler rebuilds resolution and detail a clip never had, and each of these rebuilds it differently: ByteDance's engines for taking AI-generated clips to 4K, SeedVR2 for open-weights restoration, FlashVSR for near-real-time throughput, PixVerse's in-ecosystem finisher, Veo 3.1's native resolution options, and Crystal for identity-preserving faces. This roundup covers what each one verifiably is and the routing logic for choosing — the same roster you'll meet when an upscale job comes up inside invideo.
Which AI video upscaler should you use?
| Model | Best for | Key fact (as of August 2026) |
|---|---|---|
| ByteDance Video Upscaler | AI clips → 2K/4K delivery | aigc preset; access-gated Pro tier for skin detail |
| BytePlus VOD (Standard/Pro) | Enterprise video libraries | Up to 8K; Pro ~10× Standard's price |
| SeedVR2 | Degraded footage; open weights | One-step diffusion restoration; ICLR 2026; Apache 2.0 (3B) |
| FlashVSR | Long footage, budget, speed | ~17 FPS streaming VSR on one A100 |
| PixVerse Video Upscale | Clips made in PixVerse | The 4K path for 1080p-native output |
| Veo 3.1 Upscale | Veo generations | A resolution option (1080p/4K) on Veo's own videos |
| Crystal Upscaler | Faces that must stay the same person | "No identity changes"; premium tier |
Provenance decides before quality does: PixVerse and Veo clips have captive in-house paths, faces that must survive go to Crystal, and everything else is a three-way call between ByteDance (the default), SeedVR2 (rough sources), and FlashVSR (long footage on a budget).
What is the ByteDance Video Upscaler?
ByteDance ships its video enhancement engine (internally "vCube") as a per-clip upscaler: 480p–1080p sources to 2K or 4K at up to 60 fps, with upscaling and frame interpolation in one pass. The differentiator is its preset system — aigc for AI-generated video, plus ugc, short_series, old_film, and common — tuning restoration to the source's failure modes. For AI clips headed to 4K, the aigc preset is the workhorse of this whole roundup.
A Pro tier, allowlist-gated on ByteDance's hosted deployments as of August 2026, delivers materially better skin texture and fine detail — worth requesting if human close-ups are the product. Expect minutes, not seconds: around 3–5 minutes for a 5-second clip.
When does BytePlus VOD make sense instead?
Same engine family, different packaging: BytePlus VOD (ByteDance's international cloud) bakes enhancement into its video-on-demand pipeline as Fast/Standard/Pro templates — per its docs, "over 30 atomic algorithms" spanning super-resolution, interpolation, sharpening, and color, with presets including AIGC, UGC, short drama, and classic film restoration. Super-resolution reaches 8K; the Pro tier — "large-model-driven restoration for cinematic-grade image quality," with 10/12-bit H.265 output — targets flagship remasters.
Official pay-as-you-go pricing (BytePlus docs, per minute of output): Standard from $0.2066 at 720p, Pro roughly 10× that, climbing steeply toward 8K. The routing logic: BytePlus for enhancing a library with transcode and CDN attached; the per-clip upscaler for finishing individual shots.
What is SeedVR2 and why do researchers cite it?
SeedVR2, from ByteDance's Seed research team, is the restoration model of the moment: "One-Step Video Restoration via Diffusion Adversarial Post-Training" (arXiv 2506.05301), accepted to ICLR 2026. The trick is collapsing diffusion restoration into a single inference step via adversarial post-training, with adaptive window attention handling arbitrary resolutions — so it restores any degradation type, low resolution included.
Two facts make it strategically interesting as of August 2026: the 3B variant ships under Apache 2.0 open weights — the most capable fully-open video restorer you can self-host — and it's genuinely heavy: roughly one H100 for 720p, four for 1080p–2K. One quirk from the official model card: it can over-sharpen lightly-degraded 720p AI-generated input, so for pristine AIGC clips the ByteDance aigc preset is often better-behaved. For beat-up real-world footage — old UGC, archival, compression damage — SeedVR2 is the quality reference.
What makes FlashVSR different?
Speed. FlashVSR ("Towards Real-Time Diffusion-Based Streaming Video Super-Resolution," arXiv 2510.12747, Apache 2.0) is a one-step streaming VSR model: three-stage distillation, locality-constrained sparse attention, and a tiny conditional decoder, trained on VSR-120K. The headline number from the paper: ~17 FPS at 768×1408 on a single A100, roughly 12× faster than prior one-step diffusion VSR, focused on 4×. Version 1.1 (November 2025) improved stability and fidelity.
FlashVSR is the throughput-and-cost floor of this roster: when the job is an hour of footage rather than a hero shot, it trades a fidelity step for an order-of-magnitude speed advantage. Quality-critical single shots should still go to SeedVR2 or the ByteDance Pro tier.
What does PixVerse Video Upscale do?
It's the in-ecosystem finisher. PixVerse generation tops out at 1080p natively, and the upscale endpoint is the path to higher-resolution delivery — official platform docs (August 2026) accept PixVerse-generated clips or uploads up to 100MB, 1–30 seconds, sub-4K input, at a flat 5 credits per second. If the clip was born in PixVerse, this is the friction-free route; footage from anywhere else is better served by the general-purpose models above.
Is Veo 3.1 Upscale a real upscaler? (Read this before citing it)
Mostly no — and this is the most commonly misreported item in the category. What Google shipped on January 13, 2026 is "state-of-the-art upscaling to 1080p and 4K" for Veo-generated videos: a resolution option (720p/1080p/4K) in Flow, the Gemini API, and Vertex AI, with 1080p and 4K locked to 8-second clips as of August 2026 (Veo 3.1 Lite has no 4K). Google's own docs call the high-resolution path "upscaling," which is where the confusion starts — but per current documentation you cannot hand it arbitrary footage. Official pricing: $0.40/second at 720p or 1080p, $0.60 at 4K on standard Veo 3.1 ($0.10–$0.30 on Fast).
One hedge worth recording: an April 2026 announcement pointed to a Vertex AI capability for upscaling footage not generated by Veo. We could not verify it in current official documentation as of August 2026, so treat any-footage Veo upscaling as unconfirmed. If your clip came from Veo, though, simply request 4k — it's the cleanest path there is.
When is Crystal Upscaler worth a premium?
When the face is the product. Crystal, from the developer behind Clarity AI (philz1337x), is positioned bluntly: "No more blurry faces… no plastic skin… no identity changes." The image model reaches up to 10K output with a creativity control, and a video variant (listed December 2025) applies the same identity-respecting approach to clips, capped around 5K. It sits at the premium end on cost, which is the point: talking heads and brand spokespeople justify paying for identity preservation. For everything else, ByteDance or SeedVR2 deliver more resolution per dollar.
How do these fit a real workflow?
The practical pattern in 2026 is generate → upscale → deliver. A 720p or 1080p AI generation becomes a 4K deliverable through an upscale video pass — ByteDance aigc for clean generations, SeedVR2 when the source is rough. Real-world footage with mixed problems (noise plus softness plus compression) is better served by a broader video enhancer treatment, where restoration models shine over pure upscalers. All of these engines, alongside the Topaz suite, are callable from within the invideo agent — describe the outcome ("make this 4K, keep her face exactly as it is") and the agent routes to the right model, which matters precisely because the right model changes per clip.
Frequently asked questions
What is the best AI video upscaler for AI-generated video?
The ByteDance Video Upscaler with its aigc preset is the strongest default for taking AI generations to 2K/4K, with an access-gated Pro tier for skin and fine detail. Avoid SeedVR2 on already-clean AIGC clips — its model card notes it can over-sharpen them.
What is the best open-source video upscaler in 2026?
SeedVR2's 3B model (Apache 2.0, ICLR 2026) for restoration quality; FlashVSR (Apache 2.0) for streaming speed — about 17 FPS at 768×1408 on one A100 per the paper.
Can Veo 3.1 upscale any video?
Not per current official docs: Veo 3.1's 1080p/4K "upscaling" (January 13, 2026) is a resolution option on Veo-generated 8-second clips. An April 2026 announcement suggested a broader Vertex capability, but as of August 2026 we could not confirm it in Google's documentation.
How long does AI video upscaling take?
Anywhere from near-real-time to minutes per clip: FlashVSR streams at ~17 FPS on an A100, while the ByteDance upscaler typically takes 3–5 minutes for a 5-second clip. Diffusion restoration (SeedVR2) is the heaviest, needing multiple H100s for 1080p–2K if self-hosted.
Which video upscaler preserves faces best?
Crystal is purpose-built for identity preservation ("no identity changes"); the ByteDance Pro tier is the runner-up for skin texture. Generic upscalers are where plastic-skin artifacts come from in the first place.
What resolution can AI video upscalers reach?
As of August 2026: BytePlus VOD reaches 8K, Crystal's video variant about 5K, ByteDance's per-clip upscaler 4K at up to 60 fps, and Veo 3.1 4K on its own 8-second generations.
Where can you use all of these?
Rather than juggling six vendors, serious creatives increasingly run the whole roster in one place: invideo exposes these upscalers as tools its agent can invoke mid-project — the same conversation that generated a Kling or Veo shot can send it through a ByteDance 4K pass or a SeedVR2 restoration before the edit. That's the quiet advantage of a platform carrying every major model: the decision matrix on this page becomes a routing decision, not a procurement exercise.
Version history: first published August 2026 — SeedVR2 (ICLR 2026), FlashVSR v1.1 (Nov 2025), Veo 3.1 resolution options (Jan 2026), Crystal video variant (Dec 2025).