Video

SkyReels V4 Fast

SkyReels V4 Fast is available on APIMart as skyreels-v4-fast. The SkyReels V4 research model is Skywork AI's first unified video + audio foundation model. SkyReels V4 delivers 1080p at 32 FPS with 15-second clips, native audio, and cinematic multi-shot coherence in a single generation pass. The current APIMart API does not yet support simultaneous audio and video output.

Video Generation480p / 720p / 1080p

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Service Highlights

Official Discounts
Pay-as-you-go
Fast & Low Latency

Input

Model

Prompt

60/5000

Duration5s

Resolution

Aspect Ratio

Prompt Extend

Reference Image

First Frame

End Frame

Mid Frames0/6

No mid frames added

Content Moderation

Output

Video link valid for 72 hours

SkyReels V4 Fast API Pricing

Transparent pricing with no hidden fees. Pay only for what you use.

Variant	Tier	GoldCurrent price	Platinum	Diamond	Official	Your savings
`skyreels-v4-fast`	480P	0.64Credits(~$0.064)/sec	0.608Credits(~$0.0608)/sec	0.576Credits(~$0.0576)/sec	0.8Credits(~$0.08)/sec	20%
	720P	0.88Credits(~$0.088)/sec	0.836Credits(~$0.0836)/sec	0.792Credits(~$0.0792)/sec	1.1Credits(~$0.11)/sec	20%
	480P-refvideo	1.2Credits(~$0.12)/sec	1.14Credits(~$0.114)/sec	1.08Credits(~$0.108)/sec	1.5Credits(~$0.15)/sec	20%
	720P-refvideo	1.6Credits(~$0.16)/sec	1.52Credits(~$0.152)/sec	1.44Credits(~$0.144)/sec	2Credits(~$0.2)/sec	20%
	1080P	2.2Credits(~$0.22)/sec	2.09Credits(~$0.209)/sec	1.98Credits(~$0.198)/sec	2.75Credits(~$0.275)/sec	20%
	1080P-refvideo	4Credits(~$0.4)/sec	3.8Credits(~$0.38)/sec	3.6Credits(~$0.36)/sec	5Credits(~$0.5)/sec	20%

* Actual costs are subject to final output.

SkyReels V4 Fast

Released by Skywork AI in February 2026, the SkyReels V4 research model generates video and synchronized audio together — dialogue, lip-sync, and ambient sound rendered with the visuals. SkyReels V4 Fast supports 480p, 720p and 1080p video, with a requested duration of 3–15 seconds. Tap the video to hear SkyReels V4's native audio.

50K+

Active Users

99.9%

Uptime

Faster

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Cost Savings

Eight Things That Make SkyReels V4 API Different

Capabilities of SkyReels V4 are published in the official paper and reproduced in Skywork AI's demos. All specs reflect the February 2026 release. The current APIMart API does not yet support simultaneous audio and video output.

Joint Video + Audio Generation

The SkyReels V4 research model is the first open foundation model where audio is generated alongside video. SkyReels V4 keeps dialogue lip-synced, ambient sound matched to the scene, and music cues landing on action — no separate TTS or foley pass.

Dual-Stream MMDiT Architecture

Inside SkyReels V4, one transformer branch synthesizes video and another generates temporally-aligned audio. A shared MLLM encoder keeps both SkyReels V4 streams locked to the same prompt semantics.

Multimodal Input Control

Mix text, images, video fragments and audio references in a SkyReels V4 Fast API request. Use Omni references to guide the subject, action and style; first, last and intermediate frames use the separate I2V mode.

Reference-Guided Video & Extension

Guide motion, subjects and style with a reference video, or extend an existing clip — delivered through one unified SkyReels V4 Fast call.

1080p @ 32 FPS, 15s Clips

The SkyReels V4 research model outputs native 1080p at 32 FPS with 15-second max duration — enough headroom for short-form ads, cinematic shots, and social video without post-production upscaling.

Cinematic Multi-Shot Coherence

Subject identity, lighting, and motion logic stay consistent across shot cuts. SkyReels V4 eliminates flicker or drift at scene boundaries.

Top-Ranked Prompt Adherence

The SkyReels V4 research model scores highest overall on SkyReels-VABench human evaluation — 2,000+ prompts reviewed by 50 professional evaluators. SkyReels V4 is especially strong in prompt following and motion quality.

Live on APIMart Today

SkyReels V4 is live on APIMart as skyreels-v4-fast. Your existing key, balance, and billing work unchanged — no new account, no new SDK.

Who Benefits Most from the SkyReels V4 Research Model

Teams whose workflow breaks at the boundary between video generation and audio production see the biggest lift from the SkyReels V4 research model’s unified pipeline. The following describes the SkyReels V4 series research and official demos. The current APIMart API does not yet support simultaneous audio and video output.

Short-Form Social Content

The SkyReels V4 research model produces TikTok- and Reels-ready 15-second clips at 1080p with native audio — no separate music track, no manual lip-sync pass. One SkyReels V4 call delivers the whole deliverable.

Performance Advertising

Marketing teams use the SkyReels V4 research model to produce variant-heavy ad creative: same script, multiple voice-overs, different product shots. Joint generation cuts turnaround from days to minutes.

Pre-Production & Animatics

Directors storyboard full scenes with dialogue and ambient sound in one pass. The SkyReels V4 research model collapses the temp-track phase into shot-planning — a real time save on indie projects.

Product Demos & E-commerce

The SkyReels V4 research model renders 360-style product videos with narrated voice-over and room-accurate audio. Useful for marketplaces rewarding video PDPs and retailers needing fast variant shoots.

Localized Content at Scale

Re-generate the same scene with a different voice, dialect, or language — lip-sync and motion stay consistent. SkyReels V4 is a genuine alternative to dubbing studios.

Game Cinematics & NPC Dialogue

Indie game teams prototype cutscenes and NPC interactions with the SkyReels V4 research model: character turn, line delivery, and ambient sound generated together. One SkyReels V4 call replaces a three-tool chain.

Start Using SkyReels V4 Fast API in Three Steps

SkyReels V4 Fast API is live on APIMart. Try it in the Playground on this page, or call it with your API key — no waiting, no contact form.

Create an APIMart account

Free to sign up. One account unlocks every model in the catalog, including the SkyReels V4 Fast API.

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Top up your balance

Pay-as-you-go, no monthly minimums. SkyReels V4 Fast is billed per second from your shared APIMart balance.

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Generate a key

Create a key and wire it into your app. Set the model to skyreels-v4-fast and you're done — no new SDK, no new auth flow.

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SkyReels V4 API — Frequently Asked Questions

What the SkyReels V4 API does, how it compares to other video models, and how to use it on APIMart.

What is SkyReels V4 API?

The SkyReels V4 research model is a unified multi-modal video foundation model released by Skywork AI in February 2026. Unlike earlier models that generated silent footage, it produces video and synchronized audio — dialogue, ambient sound, and music — in a single generation pass. Supports up to 1080p resolution, 32 FPS, and 15-second clip duration. The current APIMart API does not yet support simultaneous audio and video output.

How does SkyReels V4’s dual-stream architecture work?

SkyReels V4 uses a dual-stream Multimodal Diffusion Transformer (MMDiT). One branch synthesizes video frames, the other generates temporally-aligned audio, and both share an MLLM-based text encoder that keeps them locked to the same prompt. Output has lip-synced dialogue, scene-matched ambient sound, and music cues landing on action.

Does the model generate audio natively?

The current APIMart API does not yet support simultaneous audio and video output. The following describes the SkyReels V4 series research and official demos. Audio is part of the generative stream rather than a post-processing step. Dialogue, ambient sound, music cues, and environmental effects are produced at the same time as video frames. Tap any demo on this page to hear it directly.

Can SkyReels V4 edit existing video?

Guide motion, subjects and style with a reference video, or extend an existing clip — delivered through one unified SkyReels V4 Fast call.

Which SkyReels V4 model does this page use?

This page uses skyreels-v4-fast. It is billed per second and supports 480P, 720P and 1080P output, including specifications with reference-video input. Choose a resolution in the Playground on this page, or set it in your API request.

How much does it cost on APIMart?

Charges use the selected model and specification’s current per-second original price × its actual payable percentage ÷ 100 × billable seconds. Reference-video input uses its own complete rate. Reference mode uses the source video’s actual duration, capped at 10 seconds; extend mode uses the requested output duration. See the live pricing table for rates and discounts. Pay as you go, with no monthly minimum, using your shared APIMart balance and billing.

Do I need anything new to call SkyReels V4?

No. If you already have an APIMart key and balance, you're set. Switch the model ID in your existing call and it works — no new SDK, no new auth, no migration. Request/response shape stays compatible with the rest of APIMart video endpoints.

How do I start using SkyReels V4?

Two ways. Try it right away in the Playground on this page: use skyreels-v4-fast, choose a resolution, and generate. Or create an API key on the API Keys page and call the APIMart video endpoint with model set to skyreels-v4-fast — the task runs asynchronously and you poll it until the video is ready.

Is there a discount on SkyReels V4 API pricing?

Yes. The Skywork AI SkyReels V4 API is billed per second, using the selected model and specification. The pricing table on this page lists every specification for this model, and the prices shown are Gold member prices (20% off). Platinum and Diamond members save even more, up to 28%, and you only pay for successful requests.

How do I get a SkyReels V4 API key?

Sign up for an APIMart account, open the API Keys page and create a key. The same key works for the SkyReels V4 API and every other model on APIMart, with pay-as-you-go billing and no subscription.

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SkyReels V4 API — Frequently Asked Questions

What the SkyReels V4 API does, how it compares to other video models, and how to use it on APIMart.

What is SkyReels V4 API?

How does SkyReels V4’s dual-stream architecture work?

Does the model generate audio natively?

Can SkyReels V4 edit existing video?

Guide motion, subjects and style with a reference video, or extend an existing clip — delivered through one unified SkyReels V4 Fast call.

Which SkyReels V4 model does this page use?

How much does it cost on APIMart?

Do I need anything new to call SkyReels V4?

How do I start using SkyReels V4?

Is there a discount on SkyReels V4 API pricing?

How do I get a SkyReels V4 API key?

Sign up for an APIMart account, open the API Keys page and create a key. The same key works for the SkyReels V4 API and every other model on APIMart, with pay-as-you-go billing and no subscription.