Kling 4.0 AI video generator

How to use Kling 4.0

1. Write a prompt that describes the shot.
2. Add images or a video if you want to guide the result. This is optional.
3. Pick the length (3 to 30 seconds), the resolution (720p or 1080p) and the aspect ratio (16:9, 9:16, 1:1 or 21:9).
4. Choose Open in a workflow. Sign in, check the credit estimate on the board, then run it.
5. Connect the result to the next step on the board, such as an editor or another model.

Inputs explained

Prompt (required)

Set the prompt used by this model. Type: text.

Source Video (optional)

A clip to edit (swap a character, restyle, change the scene), 3 to 30 seconds, at least 700px on each side. Refer to it in the prompt as @Video1. The edit keeps the clip's length and shape and is priced on its measured length; Duration and Aspect Ratio are not used. It cannot be combined with a Start or End Frame; put images in Reference Images. Type: video.

Start Frame (optional)

Set the start frame used by this model. Type: image.

End Frame (optional)

Set the end frame used by this model. Type: image.

Reference Images (optional)

Set the reference images used by this model. Type: list of image.

Duration (seconds) (optional)

Set the duration (seconds) used by this model. Type: number. Minimum: 3. Maximum: 30. Default: 5.

Resolution (optional)

Set the resolution used by this model. Type: text. Options: 720p, 1080p. Default: "720p".

Aspect Ratio (optional)

Ignored when only a Start Frame is wired: the video follows it. Type: text. Options: 16:9, 9:16, 1:1, 21:9. Default: "16:9".

Tips before you run

Start with the default settings and change one input at a time. Keep the result you like on your board so the next step can use it.

If you add a reference file, use a link the workflow can read. Check the inputs and credit estimate on the board before starting a run.

Kling 4.0 pricing

Kling 4.0 costs about 91 credits per 5s, 720p clip at default settings, and up to about 541 credits for 30 seconds. You pay with Wireflow credits, and the board shows the estimate for your settings before you run.

See Wireflow plans and credits

Kling 4.0 vs Seedance 2.5

Both run on one Wireflow board, so you can try the same prompt on each. Try Seedance 2.5.

Kling 4.0 examples

Fight scene from three reference sheets.

GLOBAL STYLE: photoreal live-action film footage, 24 fps, natural daylight, real materials, real weight. ONE SINGLE CONTINUOUS UNBROKEN SHOT from one handheld camera, no cuts, no edits, no angle changes, no slow motion. The image fills the frame edge to edge. SCENE: a narrow sunlit lane between two walls of stacked faded shipping containers (rust red, teal, grey) at a harbour, cracked concrete ground with puddles and grit, deep blue sky with a few white clouds, bright midday sun. CHARACTERS (@Image1 controls ONLY Vesna's appearance, @Image2 ONLY the robot's appearance, @Image3 ONLY the hammer's appearance; never copy their grey studio backgrounds or their poses): - VESNA: a woman about 42 with a weathered freckled face, square jaw, a long single silver-grey braid down her back, sides shaved; a rust-orange quilted padded jumpsuit with silver reflective stripes on the upper arms and shins, black knee pads, black fingerless gloves, black combat boots. She carries THE LIME HAMMER in both hands for the whole shot: black carbon-fibre haft, brushed-steel octagonal head with a glowing lime-green core slot. - THE FOREMAN: a 3-metre bulky industrial demolition robot, a machine with no person inside: worn safety-yellow boxy body with black-and-yellow caution stripes on the shoulders, a small flat head with ONE wide glowing orange visor slot, chrome hydraulic arms, a three-fingered grabber claw on its right arm, a block fist on its left, tank treads instead of feet. Only these two appear. No other people, no crowd, no other robots. TIMELINE: 0.0 to 0.8 s: low wide two-shot down the lane. Vesna stands in the LEFT third with her back three-quarters to camera, hammer held low; the Foreman stands 15 metres away in the RIGHT half, facing her, visor glowing orange. 0.8 to 1.2 s: the camera whips fast downward to ground level, motion blur. 1.2 to 2.8 s: ground-level tracking shot racing alongside her boots as she sprints toward the robot, grit and dust kicking up from every step, the robot's treads rolling toward her in the background. 2.8 to 3.6 s: the camera tilts up fast; she leaps high into the air, hammer raised over her head with both hands, the sky behind her. 3.6 to 4.4 s: she swings the hammer DOWNWARD onto the top of the robot's head; at 4.4 s the lime-green core flares bright and a burst of orange sparks explodes off the robot's head plate. 4.4 to 6.0 s: the robot staggers BACKWARD, away from camera, two heavy steps, its visor flickering and smoke leaking from one shoulder; she lands in a crouch in front of it, hammer still in both hands. CAMERA: handheld, 28 mm lens feel, low angle, energetic but readable; the whip at 0.8 s and the tilt up at 2.8 s are the only big camera moves. PHYSICS: real weight and inertia, recoil and follow-through on the strike, the robot is heavy and slow, no floaty wire-fu, no morphing. IDENTITY LOCKS: Vesna wears the RUST-ORANGE quilted jumpsuit with silver arm and shin stripes in every frame, her single long silver braid is always visible, she keeps both hands on the black hammer haft. The Foreman stays safety yellow with caution stripes, ONE orange visor slot, a grabber claw on its right arm, tank treads, in every frame. The hammer head stays steel with a lime-green glowing core. AUDIO: none.

Kling 4.0 API

Run Kling 4.0 from your own code with the Wireflow API. Open it in a workflow, then call the run endpoint with that workflow's ID and poll for the result. Agents can run it through MCP.

# Model: Kling 4.0. Open a workflow first.
# Replace YOUR_WORKFLOW_ID with the ID in its /flow/ URL.
curl 'https://www.wireflow.ai/api/v1/workflows/YOUR_WORKFLOW_ID/run' \
  -H 'Authorization: Bearer YOUR_WIREFLOW_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"nodeIds":["model"]}'

# Response (202):
# {"data":{"executionId":"...","status":"running",
#  "poll":"/api/v1/workflows/executions/.../poll"}}
# GET the returned poll path with the same Authorization header.

Read the run API docs or connect your agent.

Read the Kling 4.0 docs

Kling 4.0 FAQ