Kling 4.0 Text to Video API

kwaivgi/kling-v4.0/text-to-video

720p / 1080p · 3–30 sec

Kling 4.0 Text to Video turns a prompt or multi-shot script into one 3–30 second 720p or 1080p video with stereo audio and five aspect ratios. It keeps scenes coherent across long takes and shot changes while following your camera, dialogue and sound directions.

Input

Prompt511/26000

Duration

Resolution

Aspect Ratio

Switch to JSON to write multi-shot prompts with multi_prompt.

OutputExample

Continue with

Kling 4.0 Image to Video Kling 4.0 Reference to Video Kling 4.0 Video Edit Kling 3.0 Turbo Pro Text to Video

REST API

Quick Start

Make your first Kling 4.0 Text to Video request in three steps. The example asks for a 10-second take with dialogue and returns a task_id.

Connect to the Vidgo API

Create an API key, keep it on your server, and send it in the Authorization header as a Bearer token.

Endpoint: POSThttps://api.vidgo.ai/api/generate/submit
Authentication: Authorization: Bearer VIDGO_API_KEY

Submit one generation task

Run the short example with a prompt. Duration, resolution and aspect_ratio have defaults.

Submit request

curl --request POST \
  --url "https://api.vidgo.ai/api/generate/submit" \
  --header "Authorization: Bearer $VIDGO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "kwaivgi/kling-v4.0/text-to-video",
  "input": {
    "prompt": "A single unbroken 10-second shot in a night market after rain. A street cook in a grey apron tosses noodles in a flaming wok, then slides them onto a plate and pushes it across the counter toward the camera. Camera: slow handheld push from the crowd to the counter, keeping the cook's face and hands in focus. Lighting: warm bulbs reflected in wet pavement, drifting steam. Audio: sizzling wok, clattering ladle, low crowd chatter; the cook says in English, \"Careful, it's hot.\" No text, no logos, no watermark.",
    "duration": 10,
    "resolution": "720p",
    "aspect_ratio": "16:9"
  }
}'

Wait for the result

Use the returned task_id to check the same task until it reaches finished or failed. On success, read data.files[].file_url.

Track status

GET https://api.vidgo.ai/api/generate/status/{task_id}

Poll every few seconds while the status is not_started or running, and stop on finished or failed. On success, read data.files[].file_url. For longer clips, lengthen the interval gradually or add callback_url to the submit request.

not_startedrunningfinishedfailed

Submit response

{
  "code": 200,
  "data": {
    "task_id": "FYVDHUJZQ3J0SH2O",
    "status": "not_started",
    "created_time": "2026-11-05T07:04:47"
  }
}

Finished response

{
  "code": 200,
  "data": {
    "task_id": "FYVDHUJZQ3J0SH2O",
    "status": "finished",
    "files": [
      {
        "file_url": "https://cdn.vidgo.ai/apis/models/kwaivgi/kling-v4.0/text-to-video/v2/01/output-01.mp4",
        "file_type": "video"
      }
    ],
    "created_time": "2026-11-05T07:04:47",
    "error_message": null,
    "progress": 100
  }
}

Complete runnable example

Open this after the three-step flow is clear. It combines submission, polling, terminal-state handling and result extraction in one script.

Complete runnable example

set -euo pipefail
: "${VIDGO_API_KEY:?Set VIDGO_API_KEY in your environment}"

REQUEST_BODY=$(cat <<'JSON'
{
  "model": "kwaivgi/kling-v4.0/text-to-video",
  "input": {
    "prompt": "A single unbroken 10-second shot in a night market after rain. A street cook in a grey apron tosses noodles in a flaming wok, then slides them onto a plate and pushes it across the counter toward the camera. Camera: slow handheld push from the crowd to the counter, keeping the cook's face and hands in focus. Lighting: warm bulbs reflected in wet pavement, drifting steam. Audio: sizzling wok, clattering ladle, low crowd chatter; the cook says in English, \"Careful, it's hot.\" No text, no logos, no watermark.",
    "duration": 10,
    "resolution": "720p",
    "aspect_ratio": "16:9"
  }
}
JSON
)

SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  --request POST \
  --url "https://api.vidgo.ai/api/generate/submit" \
  --header "Authorization: Bearer $VIDGO_API_KEY" \
  --header "Content-Type: application/json" \
  --data "$REQUEST_BODY")

TASK_ID=$(printf '%s' "$SUBMIT_RESPONSE" | jq -r '.data.task_id // .task_id // empty')
if [ -z "$TASK_ID" ]; then
  printf 'Submit response did not include task_id:
%s
' "$SUBMIT_RESPONSE" >&2
  exit 1
fi

while true; do
  STATUS_RESPONSE=$(curl --silent --show-error --fail-with-body \
    --url "https://api.vidgo.ai/api/generate/status/$TASK_ID" \
    --header "Authorization: Bearer $VIDGO_API_KEY")
  STATUS=$(printf '%s' "$STATUS_RESPONSE" | jq -r '.data.status // .status // empty')

  case "$STATUS" in
    finished)
      printf '%s' "$STATUS_RESPONSE" | jq -r '(.data.files // .files // [])[]?.file_url'
      break
      ;;
    failed)
      printf '%s' "$STATUS_RESPONSE" | jq -r '.data.error_message // .error_message // "Generation failed"' >&2
      exit 1
      ;;
    not_started|running)
      sleep 2
      ;;
    *)
      printf 'Unexpected task status: %s
' "$STATUS" >&2
      exit 1
      ;;
  esac
done

Request Parameters

model and callback_url belong at the request root; generation parameters belong inside input.

Field	Type	Required	Default	Description
model	string	Yes	—	Fixed to kwaivgi/kling-v4.0/text-to-video.
callback_url	string (URL)	No	—	A public HTTP(S) URL that receives the task result when it finishes.
input	object	Yes	—	Generation parameters: prompt or multi_prompt, plus optional duration, resolution and aspect_ratio.
input.prompt	string	No	—	Single prompt, 1–26,000 characters. Exactly one of prompt or multi_prompt.
input.multi_prompt	object[]	No	—	Shots of {prompt, duration?}; totals 3–30 s. If duration is also sent it must equal the total.
input.duration	integer	No	5	3–30 s.
input.resolution	string	No	720p	720p or 1080p.
input.aspect_ratio	string	No	auto	auto, 16:9, 9:16, 1:1, 21:9.

Response Fields

Submission returns the task identity immediately. Status responses add progress, output files or a failure message as the task advances.

Field	Type	Description
code	integer	Application result code. Successful responses use 0 or 200.
message	string	Human-readable response or error message when present.
data.task_id	string	Task identifier used in the status endpoint path.
data.status	string	Current state: not_started, running, finished or failed.
data.created_time	string	Task creation time in date-time format.
data.progress	number	Completion percentage when the provider reports progress.
data.files[]	array	Generated output files returned after a successful task.
data.files[].file_url	string	Public URL of the generated video.
data.files[].file_type	string	Generated file type, such as video.
data.files[].watermark_url	string \| null	Watermarked output URL when one is available.
data.error_message	string \| null	Failure detail when status is failed.

Task Lifecycle

Treat not_started and running as non-terminal states. finished and failed are terminal; stop polling when either is returned.

not_started
The task has been accepted and is queued to start.
running
The video is being generated. Keep polling the status endpoint.
finished
The task is complete. Read the video URL from data.files[].file_url.
failed
Generation failed. Read data.error_message for details and stop polling.

Polling and Errors

Authentication401 means the Bearer API key is missing or invalid. Check your key in the dashboard before retrying.
Validation400 means a request field is invalid or belongs to another endpoint. Check that exactly one of prompt or multi_prompt is sent.
Polling intervalPoll every few seconds while the task runs, and lengthen the interval gradually for longer clips.
Terminal statesPoll only while the status is not_started or running. Stop on finished or failed.
Callback optionAdd callback_url at the request root to receive the final result without continuous polling.

Model Specifications

Specification	Value	Description
Model	kwaivgi/kling-v4.0/text-to-video	Model identifier for asynchronous text-to-video generation.
Duration	3–30	Whole seconds; defaults to 5.
Resolution	720p \| 1080p	Defaults to 720p.
Aspect ratio	auto \| 16:9 \| 9:16 \| 1:1 \| 21:9	Defaults to auto.
Pricing	28.5 / 42.5 credits/s	720p / 1080p, per output second.

View the Kling 4.0 Text to Video API documentation

Kling 4.0 Text to Video

Kling 4.0 is the video model Kuaishou's Kling AI launched on 15 October 2026, generating up to 30 seconds in one pass. Text to Video builds the clip from words alone: write one prompt for a continuous take, or a multi_prompt list where each shot has its own description and length. Output includes a stereo audio track, so dialogue, effects and ambience written into the prompt come back with the picture.

Why choose the Kling 4.0 Text to Video API?

30 seconds in one passChoose any length from 3 to 30 seconds without stitching separate generations.
Multi-shot scriptsmulti_prompt lets each shot carry its own prompt and duration inside one video.
Stereo audio with dialogueThe output carries a stereo track; write spoken lines, effects and ambience into the prompt.
Five framing optionsauto, 16:9, 9:16, 1:1 or 21:9 for screens, feeds and cinematic shots.

Parameters

Parameter	Requirement	Description
prompt	Required unless multi_prompt is sent	One prompt for the whole clip, 1–26,000 characters after trimming. Describe action, camera, and any dialogue, effects or ambience. Send either prompt or multi_prompt. Default`—`
multi_prompt	Required unless prompt is sent	A list of shots, each {prompt (1–512 characters), duration (1–30 s, default 5)}. Shot durations must total 3–30 seconds and set the clip length. Default`—`
duration	Optional	Output length in seconds, 3–30. With multi_prompt it defaults to the shot total. Default`5`
resolution	Optional	720p or 1080p. The resolution sets the per-second rate. Default`720p`
aspect_ratio	Optional	auto, 16:9, 9:16, 1:1 or 21:9. Default`auto`

How to Use

Write the sceneDescribe action, camera movement and lighting, and put spoken lines in quotes.
Choose one take or several shotsSend prompt for one continuous take, or multi_prompt with up to 30 seconds of shots.
Set length, resolution and framePick 3–30 seconds, 720p or 1080p, and an aspect ratio.
Submit and collect the videoKeep the task_id and poll the status endpoint or use callback_url until the video URL is returned.

Usage and billing

Kling 4.0 Text to Video is billed per output second at the selected resolution.

Usage	Rate	Details
720p	28.5 credits / second	$0.1425 / output second. 5 seconds = 142.5 credits ($0.7125); 30 seconds = 855 credits ($4.275).
1080p	42.5 credits / second	$0.2125 / output second. 10 seconds = 425 credits ($2.125); 30 seconds = 1,275 credits ($6.375).

Best Use Cases

Single-take ads and brand filmsWrite a 20–30 second continuous shot with voice-over or dialogue.
Short-drama scenesScript several shots with their own timing in one multi_prompt request.
Explainers and narrated clipsPair visuals with spoken lines written into the prompt.
Vertical social videoGenerate 9:16 clips with sound ready for feeds.

Pro Tips

For a 20–30 second take, describe how the action and camera evolve over time, not just the opening moment.
In multi_prompt, keep each shot under 512 characters and give it a clear duration; shots without one default to 5 seconds.
Name the language for dialogue, for example: she says in Spanish, "Vamos."
Draft at 720p and rerun approved prompts at 1080p.

Notes

Send exactly one of prompt or multi_prompt. When both multi_prompt and duration are sent, duration must equal the shot total.
Credits are output seconds × the resolution rate and are reserved when the task is submitted.
A successful submission returns a task_id; poll the status endpoint or set callback_url to receive the result.

Related Models

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PixVerse V6 Max Image to VideoPixVerse V6 Max Image to Video animates one JPEG, PNG or WebP image into a 1–15 second video at 360p to 1080p, with an optional native audio track. The image sets the subject and framing, and a prompt of up to 2,048 characters directs motion, camera and sound.

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Kling 4.0 Video EditKling 4.0 Video Edit transforms an existing 3–30 second video from a written instruction, restyling scenes, swapping objects or adding elements at 720p or 1080p. It keeps the original timing, people and camera path that you ask to preserve while applying the change across every frame.

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Vidu Q4 Reference to VideoVidu Q4 Reference to Video combines a prompt with up to 12 reference images and 3 voice clips into 3–16 second videos at up to 4K. Tag each reference in the prompt to keep characters, products and places recognisable, with optional generated audio at no extra cost.

Gemini Omni 1.1 Flash Text-to-Video preview

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Gemini Omni 1.1 Flash Image-to-Video preview

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Gemini Omni 1.1 Flash Reference-to-Video preview

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Gemini Omni 1.1 Flash Video Edit preview

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MiniMax H3 Max Turbo Text to Video preview

MiniMax H3 Max Turbo Text to VideoMiniMax H3 Max Turbo Text to Video turns text into coherent 5–15 second videos with synchronized native stereo audio and fast generation. It follows physical motion while rendering subtle changes in light and shadow.

Kling 4.0 Text to Video API FAQ

What is the Kling 4.0 Text to Video API?

Kling 4.0 Text to Video is a Kuaishou model for generating video from text, released by Kling AI on 15 October 2026. It turns one prompt or a multi-shot script into a 3–30 second clip at 720p or 1080p with a stereo audio track. Single-pass generation up to 30 seconds keeps characters, setting and camera direction coherent across long takes and shot changes. You can call it programmatically or try it from the playground above.

How do multi-shot prompts work in Kling 4.0 Text to Video?

Send multi_prompt instead of prompt: a list of shots, each with its own prompt of up to 512 characters and a duration of 1–30 seconds (5 by default). The shot durations must total 3–30 seconds, and that total becomes the clip length.

How long can a Kling 4.0 Text to Video clip be?

Any whole number of seconds from 3 to 30, generated in a single pass. The default is 5 seconds.

Does Kling 4.0 Text to Video generate dialogue and sound?

Every clip includes a stereo audio track. Write spoken lines in quotes, name the language, and describe effects and ambience; Kling lists English, Chinese, Japanese, Korean, Spanish and other languages for dialogue.

How much does Kling 4.0 Text to Video cost?

It costs 28.5 credits ($0.1425) per output second at 720p and 42.5 credits ($0.2125) at 1080p. A 10-second 1080p clip is 425 credits.

Which aspect ratios does Kling 4.0 Text to Video offer?

auto, 16:9, 9:16, 1:1 and 21:9. Set the ratio explicitly when you deliver to a fixed format such as a vertical feed.

How does Kling 4.0 Text to Video compare with Kling 3.0 Turbo?

Kling 4.0 extends single clips to 30 seconds, adds multi-shot prompts of up to 30 seconds and offers both 720p and 1080p. Kling 3.0 Turbo Pro remains a faster, lower-cost 1080p option for clips up to 15 seconds.