Kling v2.1 Master

Video generationLegacyAvailable
by Kuaishou (Kling)Model ID: kling-v2-1-master

Kuaishou's premium Kling v2.1 Master. Generates 1080p 5s and 10s clips from text or an image with strong dynamics and prompt adherence. The top tier of the Kling 2.1 family.

Price
$0.336/s
Aspect ratios
16:9, 9:16, 1:1
Duration
5 or 10 s
Input โ†’ output
Text + Image โ†’ Video
Developer
Kuaishou (Kling)
Updated
September 23, 2026

This is an older version of the model.

Newer version available: Kling v3

01

Playground

Try Kling v2.1 Master

Input & output

$0.336/s
Try Kling v2.1 Master

0 / 2,000

What video to generate

Optional reference image for image-to-video

Advanced settings (1)

Optional seed for reproducibility

Output
Your video appears here.

This run

$1.68 ยท 168 credits

Billed: 5 s

For accounts without a purchase: runs above 2 credits need a top-up.

New here?

10 free credits ($0.10) when you sign up with Google

Usable 24 hours after sign-up, up to 5 runs per day and at most 2 credits per run. Other sign-in methods start without credits.

02

Examples

Real outputs from the public examples of this model on Replicate, with the prompt and settings that produced them. They were not generated live on this page.
  • Prompt

    a woman walking in a park

    Length: 0:05

    Settings

    aspect_ratio
    16:9
    duration
    5
  • Prompt

    an anime woman runs down a city street in the rain (in an illustrated 1990s anime style), she is wearing a long dress

    Length: 0:05

    Settings

    aspect_ratio
    16:9
    duration
    5
  • InputInput

    Prompt

    a woman gestures to the words with both hands, she is pleased, behind her it is raining

    Length: 0:05

    Settings

    aspect_ratio
    16:9
    duration
    5
03

About Kling v2.1 Master

TL;DRAs of September 23, 2026

Kling v2.1 Master is a model by Kuaishou (Kling) in the Video generation category. On Railwail, Kling v2.1 Master costs $0.336 per second of video. A default run of 5 seconds costs $1.68. Supported aspect ratios: 16:9, 9:16, and 1:1. Possible lengths: 5 or 10 s. Newer version: Kling v3.

04

Pricing

Prices in US dollars. Usage is charged from prepaid credits.
Per second$0.336 per second of video
Default run (5 s)$1.68 per run
  • 1 credit = $0.01

Cost calculator

Price calculator

Video length

Total

$168.00

16,800 credits

Per run

$1.68 ยท 168 credits

billed as 5 s

Fixed price per run, known before the run starts.

05

API

Call Kling v2.1 Master with your Railwail API key. Use this model ID in the request:
curl https://railwail.com/api/v1/videos/generations \
  -H "Authorization: Bearer $RAILWAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-v2-1-master",
    "prompt": "A slow drone shot over a misty pine forest at sunrise"
  }'

# Response: {"job_id": "...", "status": "queued", ...}
# Poll until status is completed, failed or cancelled:
curl https://railwail.com/api/v1/jobs/JOB_ID \
  -H "Authorization: Bearer $RAILWAIL_API_KEY"
Set your key as RAILWAIL_API_KEYCreate API key

Videos run asynchronously: the first call returns a job_id; query /api/v1/jobs/JOB_ID until the status is completed.

06

Specifications

Model ID
kling-v2-1-master
Input
Text, Image
Output
Video
Aspect ratios
16:9, 9:16, 1:1
Duration
5 or 10 s
Billing
Fixed price, known before the run
Lifecycle
Legacy
Catalog entry updated
September 23, 2026

Input parameters

Inputs and settings from the model's input schema. The example in the API section shows which of them the API accepts.

  • promptrequired

    What video to generate

    Type: Text
    Default: โ€“
    Allowed values: up to 2,000 characters
  • seed

    Optional seed for reproducibility

    Type: Integer
    Default: โ€“
    Allowed values: โ€“
  • start_image

    Optional reference image for image-to-video

    Type: Text
    Default: โ€“
    Allowed values: โ€“
  • aspect_ratio
    Type: Choice
    Default: 16:9
    Allowed values: 16:9, 9:16, or 1:1
  • duration_sec
    Type: Choice
    Default: 5
    Allowed values: 5 or 10

Tags

  • replicate
  • kuaishou
  • kling
  • text-to-video
  • image-to-video
  • flagship
07

Use cases

08

Frequently asked questions

What is Kling v2.1 Master?

Kling v2.1 Master is a model by Kuaishou (Kling) in the Video generation category. On Railwail you can call it with an API key through the Railwail API.

How much does Kling v2.1 Master cost on Railwail?

On Railwail, Kling v2.1 Master costs $0.336 per second of video. A default run of 5 seconds costs $1.68. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals $0.01.

Which settings does Kling v2.1 Master support?

According to its input schema, Kling v2.1 Master knows these parameters: prompt (up to 2,000 characters), seed, start_image, aspect_ratio (16:9, 9:16, or 1:1), and duration_sec (5 or 10).

How fast is Kling v2.1 Master?

There are not enough measured runs of Kling v2.1 Master on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.

Is Kling v2.1 Master better than Kling v3?

That depends on the task. Kling v2.1 Master (Kuaishou (Kling)) and Kling v3 (Kuaishou (Kling)) are both models in the Video generation category. The comparison page shows their prices and specifications side by side.

Compare Kling v2.1 Master and Kling v3

Can Kling v2.1 Master use an image as input?

Yes. Send the image in the start_image parameter.

How do I use Kling v2.1 Master through the API?

Create a Railwail API key and send your request with the model ID kling-v2-1-master. Code examples for curl, Python and JavaScript are in the API section of this page.

09

Comparable models

All in this category

Use Kling v2.1 Master via the API

One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = $0.01.