How does SkyReels V4 compare to Sora 2 and Veo 3.1?

SkyReels V4 is the only model that generates synchronized audio natively in a single pipeline. Sora 2 has no audio output. Veo 3.1 has experimental audio but requires a separate model. SkyReels V4 also accepts 5 input modalities (vs 2 for Sora 2), supports better multilingual dialogue (vs Sora 2's English-only), and the SkyReels V4api is roughly 70% cheaper than Veo 3.1 API. The trade-off: SkyReels V4 max length is 15s (vs Sora 2's 45s and Veo 3.1's 60s).

🔥 #1 Artificial Analysis Arena · SkyReels V4 Now Live

SkyReels V4 The First AI That Sees, Hears & Creates

Q: What is SkyReels V4 and what makes it different?

SkyReels V4 is the world's first unified multimodal video-audio foundation model from Skywork AI. Unlike Sora 2 or Veo 3.1 which need separate audio pipelines, SkyReels V4 generates synchronized video and audio in a single render — including lip-synced dialogue, sound effects, and background music. It uses a dual-stream Multimodal Diffusion Transformer (MMDiT) architecture and ranks #1 on the Artificial Analysis text-to-video-with-audio leaderboard.

Q: What are the technical specifications of SkyReels V4?

SkyReels V4 outputs 1080p video at 32 FPS, up to 15 seconds long, with native synchronized audio. It accepts five input modalities: text, image, video clip, binary mask, and audio reference. The model is built on a dual-stream MMDiT with shared MLLM text encoder, and supports inpainting, character reference (CRef), beat-aware camera cuts, and multilingual lip-sync.

Q: How much does SkyReels V4api cost?

SkyReels V4api is priced at approximately $8.40 per minute of generated video — about 40% the cost of Google Veo 3.1 ($30/min) and significantly cheaper than other premium video models. APIMart provides unified access to SkyReels V4api alongside other top video models. For consumer use, SkyReels.ai offers Basic at $19.9/mo, Pro at $34.9/mo, and Ultra at $69.9/mo (annual pricing).

Q: When was SkyReels V4 released?

SkyReels V4 was released on 2026-02-25, with the official paper published on arXiv (2602.21818). Skywork AI made the public announcement on 2026-04-03. The model is currently in Beta with limited preview API access — SkyReels V4api is rolling out to developers via APIMart and other providers.

Q: Is SkyReels V4 open source?

SkyReels V1, V2, and V3 are open-source on GitHub (SkyworkAI org), with V2 reaching 6.8k+ stars. SkyReels V4 itself is not yet open-sourced — only the research paper is available on arXiv. The model is accessible via SkyReels.ai consumer subscription or SkyReels V4api through approved providers like APIMart.

SkyReels V4 is the world's first unified video-audio foundation model. Generate cinema-quality 1080p video with native synchronized audio — lip-sync, SFX, BGM — in a single render. Built by Skywork AI. SkyReels V4api now available for developers via APIMart.

🎬 Try SkyReels V4 Now ⚡ Get SkyReels V4api Access

Native Resolution

<3s

Cinematic Frame Rate

99%+

Length with Sound

#1 Arena (with Audio)

skyreels-v4 · MMDiT · 1080p · Native Audio Demo

              
              SkyReels V4 · LIVE OUTPUT · 1080p · Native Audio
            

SkyReels V4 demo: cinematic 1080p video with synchronized native audio output

demo: SkyReels V4 cinematic shot + ambient audio

SkyReels V4 demo: lip-synced character dialogue with frame-perfect audio alignment

demo: SkyReels V4 lip-sync dialogue (5 languages)

SkyReels V4 demo: product showcase video with ambient sound generated natively

demo: SkyReels V4 product video + native SFX

SkyReels V4 demo: beat-aware camera cuts synced to music track

demo: SkyReels V4 beat-aware camera cuts

✦ Core Capabilities

Eight Breakthroughs of SkyReels V4

SkyReels V4 introduces a brand-new dual-stream Multimodal Diffusion Transformer (MMDiT) architecture, redefining what AI video generation can do.

🔤

Native Video + Audio Generation

Industry first. SkyReels V4 generates synchronized video and audio in a single pipeline — lip-sync, SFX, ambient sound, all aligned at the microsecond level. No post-production audio alignment needed.

📸

Five Multimodal Inputs

Text, image, video clip, binary mask, audio reference — five input modalities in one unified interface. SkyReels V4 understands all of them simultaneously, far beyond Sora 2's text+image only.

🌍

Region-Level Inpainting

Mask any region of a video and regenerate it while preserving the rest. SkyReels V4 lets you replace objects, remove subtitles, or swap backgrounds while keeping motion and lighting consistent.

⚡

Character Reference (CRef)

Lock the same character across multiple shots without face drift. SkyReels V4 solves the industry-wide character consistency problem that haunts Sora, Veo and Runway.

🖼️

Multilingual Speech & Lip-Sync

Generate dialogue in Chinese, English, Japanese, Korean, Russian and more — with frame-accurate lip-sync and emotional intonation. SkyReels V4 goes truly global.

🔡

Beat-Aware Camera Cuts

Feed in a beat track and SkyReels V4 cuts shots and motion to the rhythm. Perfect for TikTok, Reels and music-driven short-form content.

V4 Showcase

SkyReels V4 — Real Demo Outputs

Each clip below was generated by SkyReels V4 with native synchronized audio in 15 seconds or less. No external audio model, no post-production alignment.

SkyReels V4 generated: cinematic 1080p shot with native ambient audio, rain on window, 15 seconds

Prompt: "a quiet rainy morning scene with ambient room tone" — generated by SkyReels V4

SkyReels V4 · text-to-video

★ Lip-Sync Score 9.7/10

SkyReels V4 generated: character delivering multilingual dialogue with frame-perfect lip-sync

Prompt: "Asian woman speaking Mandarin with perfect lip-sync" — SkyReels V4

SkyReels V4 · image-to-video

⚡ 15s with audio · SkyReels V4

SkyReels V4 generated: product showcase video with synchronized sound effects

Prompt: "product spinning on white background with whoosh SFX" — SkyReels V4

SkyReels V4 · audio-driven

★ Native SFX · SkyReels V4

SkyReels V4 generated: storefront video with ambient city sound and traffic noise

Prompt: "city street at dusk with traffic and pedestrian audio" — SkyReels V4

SkyReels V4 · text-to-video

⚡ Lip-sync · SkyReels V4

SkyReels V4 generated: audio waveform visualization synchronized with video frames

Prompt: "audio waveform pulsing with the bass drop" — SkyReels V4

SkyReels V4 · image-to-video

★ Audio waveform sync · SkyReels V4

SkyReels V4 generated: music-driven montage with beat-aware camera cuts

Prompt: "dance montage cut to drum hits at 120 BPM" — SkyReels V4

SkyReels V4 · audio-driven

🏆 Beat-aware cuts · SkyReels V4

▶

SkyReels V4: Dual-Stream MMDiT Architecture Walkthrough
@Skywork_ai · April 17, 2026

🔥 Architecture Deep Dive

How SkyReels V4 Beat Sora 2 and Veo 3.1

On 2026-02-25, Skywork AI released the SkyReels V4 paper on arXiv (2602.21818). At its core: a dual-stream MMDiT architecture where video and audio diffusion streams cross-attend through a shared MLLM text encoder.

On 2026-03-19, SkyReels V4 climbed to <strong>#1 on the Artificial Analysis text-to-video-with-audio leaderboard</strong>, surpassing Veo 3.1 and Kling 3.0. Independent testers reported "frame-perfect lip-sync" and "drum hits land where they should." SkyReels V4api access then opened to developers via APIMart and other partners.

Native Audio MMDiT Lip-Sync 1080p 15s with Sound

📊 Comparison

SkyReels V4 vs SkyReels V3

SkyReels V4 is not an incremental upgrade over V3 — it is a fundamental architectural rewrite that adds native audio generation.

SkyReels V3 (Previous)

Legacy

SkyReels V3 sample — silent video, no native audio capability

✗Silent video only — no native audio generation
✗Requires separate TTS + DAW workflow for sound (15-20 min/clip)
✗Max resolution 720p / 24 FPS
✗No multimodal mask input
✗Limited character consistency across shots
✗No beat-aware camera cuts
✗Open-source only — no managed API

SkyReels V4 (Now Live)

Available Now

SkyReels V4 sample — 1080p cinematic with synchronized native audio

✓Native synchronized audio — single-pipeline generation
✓Frame-perfect lip-sync (microsecond alignment)
✓1080p / 32 FPS / 15s cinema-quality
✓5 input modalities (text/image/video/mask/audio)
✓Dual-stream MMDiT + shared MLLM text encoder
✓Multilingual lip-sync (CN/EN/JP/KR/RU)
✓SkyReels V4api at $8.40/min (40% of competitors)

Capability	SkyReels V4 ⚡	Sora 2	Veo 3.1	Kling 3.0	Runway Gen-4.5
Native Audio Generation	✓ Single pipeline	✗ Not supported	~ Experimental	✗ Not supported	✗ Not supported
Max Resolution	1080p (→1440p)	1080p	1080p (→4K)	Native 4K	1080p
Max Length (single render)	15s with audio	45s	60s	10s	10s
Lip-Sync Accuracy	Frame-perfect	N/A (no audio)	Decent	N/A	N/A
Input Modalities	5 (T+I+V+M+A)	2 (T+I)	3 (T+I+V)	2 (T+I)	3 (T+I+V)
Multilingual Speech	5+ languages	English only	3 languages	N/A	N/A
API Price / Minute	$8.40	Not available	~$30.00	~$15.00	~$12.00

💼 Use Cases

Who's Already Using SkyReels V4?

From short-form social content to enterprise marketing, SkyReels V4 redefines AI video production with its native audio capability.

Short Video

TikTok / Reels / Shorts

15-second native-audio output is perfect for vertical short video. SkyReels V4 generates BGM + lip-synced dialogue + cuts to the beat — full TikTok-ready clip in one render.

E-Commerce

Product Demo Videos

Upload a product photo + a short prompt → SkyReels V4 generates a video with ambient sound. Mask editing lets you swap backgrounds for multi-SKU variants.

Marketing

Multilingual Ad Creatives

SkyReels V4 lip-syncs dialogue in 5+ languages from a single asset. Same brand spokesperson, same script, five language versions — produced via SkyReels V4api in minutes.

SkyReels V4 game cutscene and educational video generation

Game / Edu

Cutscenes & Tutorials

Generate cinematic cutscenes with VO and ambient SFX, or educational explainers with lip-synced narration. SkyReels V4 saves 15-20 min/clip vs traditional DAW + video editor workflow.

📅 Release Roadmap

SkyReels Family Timeline

From open-source V1 to closed-source V4 with native audio — Skywork AI's video model evolution.

✓

February 2025

SkyReels V1 Open-Sourced

First image-to-video model from Skywork AI, based on Hunyuan. Released on GitHub with weights and inference code.

✓

April 2025

SkyReels V2 — Diffusion Forcing

14B-parameter model with infinite-length generation via Diffusion Forcing. Reached 6.8k+ GitHub stars; the standard open-source video baseline.

🔥

Mid 2025

SkyReels V3 — Multimodal In-Context

720p / 24 FPS with multimodal in-context learning. First version to support character reference across shots.

🔥

February 25, 2026

SkyReels V4 Released — Native Audio

Paper on arXiv (2602.21818). World's first unified video-audio foundation model. Dual-stream MMDiT with shared MLLM text encoder.

⏳

March-April 2026

#1 Arena · SkyReels V4api Open

SkyReels V4 ranks #1 on Artificial Analysis text-to-video-with-audio. SkyReels V4api opens to developers via APIMart. Limited preview now available.

💰 Pricing

Access SkyReels V4api via APIMart

SkyReels V4api is integrated into APIMart with unified billing and no minimums. Below are SkyReels-equivalent consumer tiers.

Basic

$0.15 / minute

Standard 1080p · 15s clips

✓SkyReels V4 standard quality
✓1080p · 24/30 FPS
✓Native audio (lip-sync + SFX)
✓Text + Image inputs
✓Community support

Start Free

Everything About SkyReels V4

The most comprehensive SkyReels V4 and SkyReels V4api Q&A, continuously updated.

What is SkyReels V4 and what makes it different from Sora 2? ▾

SkyReels V4 is Skywork AI's world-first unified video-audio foundation model. Unlike Sora 2 (no audio) or Veo 3.1 (separate audio model), SkyReels V4 generates synchronized video and audio in a single pipeline using a dual-stream MMDiT architecture. It currently ranks #1 on the Artificial Analysis text-to-video-with-audio leaderboard.

What are the technical specifications of SkyReels V4? ▾

SkyReels V4 outputs 1080p video at 32 FPS, up to 15 seconds long, with native synchronized audio. It accepts five input modalities: text, image, video clip, binary mask, and audio reference. Built on a dual-stream MMDiT with shared MLLM text encoder. Supports inpainting, character reference (CRef), beat-aware camera cuts, and multilingual lip-sync.

How much does SkyReels V4api cost? ▾

SkyReels V4api is approximately $8.40 per minute of generated video — about 40% the cost of Veo 3.1 ($30/min). APIMart provides unified access. For consumer use, SkyReels.ai offers Basic $19.9/mo, Pro $34.9/mo, Ultra $69.9/mo (annual). A free tier with 50 credits is available.

When was SkyReels V4 released and is the SkyReels V4api public? ▾

SkyReels V4 was released on 2026-02-25 with the paper on arXiv (2602.21818). Skywork AI announced V4 publicly on 2026-04-03. The SkyReels V4api is currently in limited preview, rolling out via approved providers like APIMart.

How does SkyReels V4 compare to Veo 3.1, Kling 3, and Runway Gen-4? ▾

SkyReels V4 is the only model with truly native synchronized audio. It also supports the most input modalities (5), the best multilingual lip-sync, and the lowest API price among premium models. Trade-off: SkyReels V4 max length is 15s vs Sora 2's 45s and Veo 3.1's 60s. For audio-driven content, SkyReels V4 is class-leading.

Is SkyReels V4 open source? Can I self-host? ▾

SkyReels V1, V2, V3 are open-source on GitHub (SkyworkAI org), with V2 reaching 6.8k+ stars. SkyReels V4 itself is not yet open-sourced — only the arXiv paper is public. Use SkyReels.ai (consumer) or SkyReels V4api via APIMart (developer) to access V4.

SkyReels V4 The First AI That Sees, Hears &amp; Creates