Kling O3 API

Introduction

Kling O3 Image to video animates your own opening frame. Upload an image, optionally add a closing frame to pin the ending, and describe what happens in between - the prompt field takes up to 2,500 characters. Choose a length of 3 to 15 whole seconds, a resolution up to 4K, and whether to generate native audio with the picture.

Choose a Kling O3 mode by starting material

Key features

The opening frame is followed closely

Whoever and whatever is in your frame - the people, the wardrobe, the room - is what the clip keeps. In our umbrella example, the two women's faces matched the opening frame all the way through a five-second clip; the prompt only had to describe the new action.

An optional closing frame pins the ending

Add last_image_url and the clip is built to land on that frame instead of wherever the model would otherwise stop. Keep the two frames close in light, angle and framing - a large jump between them is what makes the middle of a long clip wander.

Sound generated with the motion

generate_audio adds dialogue, effects and ambience in the same pass as the animation, timed to the action you describe rather than added in a separate step afterward.

Request parameters

Pricing

Prices are in credits, the same credits you use on the website (1 credit = $0.01). The hold is taken when the task is accepted and settled to the actual charge when it finishes; failed tasks are refunded.

Each task is rounded up to whole credits, so one run at the lowest tier costs 51 credits for a 5-second clip ($0.51).

For an exact number before you run, send the same body to POST /jobs/quote.

Use cases

Animate a frame you have already approved

When the exact people, wardrobe and composition matter, generate or select the still first, then send it here instead of leaving those details to a text prompt - which redraws them fresh on every run.

Bridge two frames you already have

With both image_url and last_image_url set, the clip fills in a believable motion path between an approved start and an approved end - useful for a scene that has to land on a specific final composition.

Add dialogue to a still you already like

Turn on generate_audio and describe a line of dialogue along with the action; the frame supplies the look, the prompt supplies the movement and the words.

Prompt guide & pro tips

Describe the after, not the already-there

Do not redescribe who is in the frame or what they are wearing - the image already answers that. Spend the prompt on what changes: the action, the camera move, the sound.

Keep a closing frame close to the opening one

If you use last_image_url, choose or generate a frame with similar light and framing to the opening image. A near match keeps the motion in between believable; a big jump asks the model to invent more than it can hold steady.

Lock the take when continuity matters

Shot_type single is a preference, not a guarantee. For a scene that must not cut - a single unbroken reaction, for instance - add "one continuous shot, no cuts" to the end of the prompt.

API quick start

Call the Kling O3 API in three steps

1. Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow- and use the same credits as the website.
2. Send the request. POST /jobs/createTask with model kling/o3/image-to-video and an input object that follows the parameter table. The response returns a task ID straight away.
3. Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.

# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "kling/o3/image-to-video",
  "input": {
    "prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
    "image_url": "https://media.popnow.ai/influencer/examples/marco.webp",
    "resolution": "720p",
    "duration_seconds": 5,
    "shot_type": "single"
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.

Kling O3 API questions

All Kling models

Kling 3.0 is the pick for a single polished shot with first and last frames or Motion Control. O3 wins when you need reference photos, video editing or several modes in one place.

• Kling 3.0 API4K clips, multi-shot cuts and motion controlFrom 51 credits for a 5-second clip
• Kling O3 APIKling’s unified model: create, animate, reference and edit up to 4KFrom 51 credits for a 5-second clip
• Kling 3.0 Turbo APIFaster Kling 3.0 with sound on every clipFrom 84 credits for a 5-second clip
• Kling Avatar 2.0 APIA portrait that speaks or sings your audio, up to 5 minutesFrom 7.68 credits per second
• Kling 2.6 API1080p clips with optional sound and motion controlFrom 52 credits for a 5-second clip
• Kling 2.5 Turbo API1080p clips with a soundtrack on every takeFrom 42 credits for a 5-second clip
• Kling 2.1 Master APISilent 1080p clips with fine prompt controlFrom 162 credits for a 5-second clip
• Kling 2.1 APIAnimate a frame at 720p or 1080p, with an optional end frameFrom 27 credits for a 5-second clip

Other video APIs

• MiniMax H3 APIExpressive clips with audio, up to 2KFrom 28 credits for a 5-second clip
• Seedance 2.5 APIByteDance's newest: 30-second clips with native audioFrom 56 credits for a 5-second clip
• Vidu Q4 Preview APIUp to 4K clips with sound and spoken dialogueFrom 34 credits for a 5-second clip
• Wan 3.0 APIUp to 30-second clips with synced audioFrom 34 credits for a 5-second clip
• MiniMax H3 Max APIFast clips with ambience, effects and musicFrom 38 credits for a 5-second clip
• LTX 2.5 APILong 20-second takes up to 4K with a soundtrackFrom 68 credits for a 5-second clip

More about Kling O3

Try it

Kling O3 AI Video Generator onlineCreate videos with Kling O3 in PopNow

Compare

Kling 3.0 vs Kling O3

Docs

Kling O3 model ID and input schema in the API docsPopNow API quickstart: your first request in five minutesImage to video guide for the PopNow APIWebhooks: get Kling O3 results without polling