Kling 2.1

Video GenerationMulti-Tier APIStart / End Frames

Kuaishou’s Kling AI 2.1 improves motion performance, physical simulation, and semantic responsiveness for short-form video generation. APIXO groups four workflows across its Standard, Pro, and Master tiers on one route, covering single-image animation, Pro first-and-last-frame transitions, and Master text-to-video or image-to-video production.

APIXO Modes

Standard / Pro / Master

APIXO Price

From 200 Credits / videoStandard image-to-video, 5 seconds

Duration

5 or 10 seconds

Image Inputs

1–2 imagesMode-dependent

Released

May 2025

Capabilities

Four workflows with distinct production roles

Improved Motion Performance

Kling AI 2.1 improves the coherence and quality of subject movement across short generated scenes. This supports more natural character action, object motion, and camera-led compositions.

More Realistic Physics

More realistic physical simulation helps generated subjects and objects interact more plausibly with movement, weight, contact, and the surrounding environment. Complex interactions should still be reviewed before production use.

Stronger Semantic Response

Improved semantic responsiveness helps the model interpret detailed instructions about subjects, actions, camera direction, lighting, atmosphere, and scene development with greater accuracy.

Start-and-End Frame Control

Pro image-to-video accepts one start frame or a start frame plus one end frame. The model generates the transition between the supplied endpoints, supporting defined entrances, exits, and visual reveals.

Tiered Production Quality

Kuaishou describes Kling AI 2.1 as improving motion performance and realistic physical simulation over the preceding generation, supporting more coherent movement and interactions within compact generated scenes.

Prompt Guidance Controls

APIXO supports prompts up to 5,000 characters, negative prompts up to 500 characters, and CFG scale from 0 to 1. These controls balance instruction adherence against creative variation.

Production Specifications

Kling 2.1 controls through APIXO

Inputs and framing depend on the selected tier and workflow.

Exposed Modes

5s / 10s

Clip Lengths

16:9 / 9:16 / 1:1

Master T2V Ratios

JPG / PNG / WebP

Image Formats

10 MB per image

Image Limit

1 MP4 URL

APIXO Output

Production Uses

Plan short shots around the right tier

Campaign Production

Animate Approved Key Art

Turn product photography, campaign artwork, or editorial stills into five- or ten-second motion assets. Standard supports economical variation, while Master image-to-video provides the premium route for higher-priority shots.

Transition Design

Connect Two Defined Frames

Use Pro image-to-video with a starting frame and optional ending frame to prototype transformations, time shifts, environment changes, or visual reveals. The model generates the transition rather than performing deterministic interpolation.

Concept Development

Generate Shots from Text

Use Master text-to-video to explore scenes without preparing source artwork. Specify subject action, environment, camera direction, lighting, and timing, then select horizontal, vertical, or square framing for the intended placement.

Previsualization

Test Motion and Physical Interaction

Prototype character movement, object behavior, camera motion, and scene transitions before filming or animation. Review complex contact, rapid action, anatomy, and continuity carefully before treating a generated clip as production-ready.

Creation Workflow

Configure Kling 2.1 without mixing tier rules

Select the mode before preparing images, framing, and delivery.

Choose the Required Tier

Select Standard for one-image animation, Pro for optional end-frame control, or Master for text-to-video and premium one-image animation. Pricing changes with both tier and duration.

Prepare the Correct Inputs

Write a non-empty prompt and choose five or ten seconds. Add one image for Standard or Master image-to-video, or one to two images for Pro. Master text-to-video accepts no images.

Submit and Store the Result

Use APIXO polling or a webhook callback to receive the asynchronous result. Download completed MP4 output promptly because the documented result URL expires after 15 days.

Integration Notes

Keep tier-specific constraints explicit

APIXO requirements

Every mode requires a prompt between 1 and 5,000 characters and a duration of 5 or 10 seconds.

Standard and Master image-to-video require exactly one publicly accessible image URL.

Pro image-to-video accepts one start frame or a start frame plus one end frame.

Aspect-ratio selection applies only to Master text-to-video on the documented APIXO route.

APIXO does not expose audio generation, video extension, video input, lip sync, or motion-control modes here.

Outputs remain subject to safety moderation, and completed result URLs expire after 15 days.

Kling 2.1 questions

APIXO groups Standard image-to-video, Pro image-to-video, Master text-to-video, and Master image-to-video. The route therefore covers three Kling 2.1 quality tiers, but not every tier supports the same input workflow.

Standard image-to-video costs 200 Credits for five seconds or 400 Credits for ten. Pro image-to-video costs 350 Credits or 700 Credits. Each Master workflow costs 1,000 Credits for five seconds or 2,000 Credits for ten.

Yes, but only through APIXO’s Pro image-to-video mode. Supply one image for the starting frame and optionally a second for the ending frame. Standard and Master image modes accept exactly one image.

Kuaishou officially positioned Kling AI 2.1 Standard at 720p and its High Quality tier at 1080p. APIXO names Standard, Pro, and Master modes but does not publish an explicit resolution field or complete resolution mapping for this route.

Inspect subject identity, hands, anatomy, embedded text, object contact, rapid motion, and the continuity of complex transitions. Start-and-end-frame guidance defines endpoints but does not guarantee a physically exact path between them.

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