Kling 4.0 vs Kling O3

Kling 4.0 vs Kling O3 at a glance

Kling 4.0 and Kling O3 are both Kling AI models in the Video Generation category, available through the EmpirioLabs API.

Key differences

• Kling 4.0 is the newer release (Oct 15, 2026); Kling O3 was released on Feb 5, 2026.
• Input types only Kling O3 accepts: Audio.
• Capabilities listed only for Kling 4.0: video generation, text to video, image to video.

Kling 4.0 vs Kling O3: specs

Kling 4.0 vs Kling O3: API pricing

Live rates from the EmpirioLabs catalog for both models. Each rate card always matches what the API charges.

Kling 4.0 vs Kling O3: API parameters

Request parameters each model lists on EmpirioLabs, with the allowed values or range where one applies. A dash marks a parameter the model does not list.

Kling 4.0 vs Kling O3: limits and notes

Kling 4.0

Generates 3 to 30 second clips at 24 fps in 720p or 1080p, each with a native stereo audio track.

Inputs

• Text to video: prompt only.
• Keyframes: a first frame (image), middle frames (middle_images) and a last frame (image_end). The video follows the first frame's aspect ratio.
• Reference images (reference_images): characters, objects, scenes or style to use.
• Reference videos (reference_videos): motion, camera work or style to follow, 3 to 30 seconds each.
• Video edit (video): a video to edit, 3 to 30 seconds. The result keeps its length and aspect ratio.
• Up to 10 images and 5 videos per request. In the prompt, refer to images as @image_1, @image_2 (first frame, middle frames, last frame, then references) and to videos as @video_1, @video_2 (the video to edit first).

In the Playground

One attached image is the first frame, two are the first and last frames, and three or more are references. The first attached video is the one edited; any others are references.

Media limits

• Images: JPG or PNG, at least 300 px, aspect ratio between 2:5 and 5:2, up to 30 MB.
• Videos: MP4 or MOV, 3 to 30 seconds, 700 to 4553 px per side, up to 300 MB.

Billing

• Without a video input: billed per second of the generated clip at the resolution you request.
• With a video input (a video to edit or a reference video): billed at the video input rate on twice the length of the generated clip, or on the input plus the output when the input is longer.

Kling O3

Video model in Standard or Pro modes with text-to-video, image-to-video, reference-to-video, editing, native sound, and multi-scene transitions.

Uploaded media preprocessing

• Video inputs are capped to 10 seconds for video-edit and video-reference workflows.
• Uploaded video inputs are normalized to provider-compatible MP4 when needed.
• Kling O3 4K supports text, image, and image-only reference workflows. Use Standard or Pro for video inputs.

How to call Kling 4.0 and Kling O3

Kling 4.0 runs through POST /v1/videos/generations. The request returns a job_id right away; poll GET /v1/jobs/{job_id} until the job completes and read the output URLs from the result. Both models are called through the same endpoint. Set model to kling-4-0 or kling-o3. Get an API key from the EmpirioLabs dashboard.

curl https://api.empiriolabs.ai/v1/videos/generations \
  -H "Authorization: Bearer $EMPIRIOLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-4-0",
    "prompt": "Describe what you want Kling 4.0 to generate."
  }'

Kling 4.0 vs Kling O3: tests and guides

Prompt tests and comparison runs that cover both models.

Guides Kling 4.0 vs Kling 3.0 Turbo vs Kling O3: Which Kling Video API to Use Kling 4.0 reaches 30 second clips with keyframes and reference videos. Kling 3.0 Turbo is text and image to video with...

Kling 4.0 vs Kling O3: common questions

What is the difference between Kling 4.0 and Kling O3?

Kling 4.0 is the newer release (Oct 15, 2026); Kling O3 was released on Feb 5, 2026. Input types only Kling O3 accepts: Audio. Capabilities listed only for Kling 4.0: video generation, text to video, image to video. The specs, rate cards, and parameters on this page come from the live EmpirioLabs catalog.

Which is newer, Kling 4.0 or Kling O3?

Kling 4.0 is the newer release (Oct 15, 2026); Kling O3 was released on Feb 5, 2026.

Which has the lower rate, Kling 4.0 or Kling O3?

The two models are priced on different units or tiers, so compare the live rate cards on this page. They always match what the API charges.

Can I switch between Kling 4.0 and Kling O3 without rebuilding my integration?

Yes. Both models use POST /v1/videos/generations with the same EmpirioLabs API key, so most integrations switch by changing the model value. Check the parameters table on this page first if you rely on a model-specific parameter.

Can I try Kling 4.0 and Kling O3 in the browser before integrating?

Yes. Open each model in the EmpirioLabs playground and run the same prompt on both, with the parameters the API exposes.