Kling 4.0 API for 30-Second 4K HDR Video

Kling 4.0 is Kuaishou's native multimodal video model for text-to-video, image-guided creation, Omni Reference, multi-keyframe control, audio-video generation, and video editing. It is designed for sustained motion, planned camera work, recognizable characters or products, and stories that need more than a five- or ten-second clip.

It generates 3–30 seconds in one pass. Multiple Keyframes accepts up to 10 keyframe images, while Omni Reference accepts up to 15 combined assets. The modes are separate: use keyframes to set visual states along a timeline, or use Omni Reference when identity, style, motion, voice, and setting come from source assets.

The prompt ceiling is 8,000 tokens, leaving room for shot timing, dialogue, camera movement, sound, and continuity rules. It is a limit, not a target; a shorter structured prompt is easier to debug.

Kling 4.0 API Details

Kling 4.0 API for Ecommerce and Batch Video Workflows

Kling 4.0 fits product launches, on-model fashion clips, marketplace videos, social ads, and campaign variations where a product or spokesperson must remain recognizable. Use product images to establish appearance, a reference video to communicate movement or pacing, and the prompt to define what changes over time.

Separate fixed requirements from creative direction. Lock product shape, packaging, logo placement, materials, and approved colors first; then describe shots, camera path, lighting, dialogue, sound, and the final CTA. For batch generation, use a reusable brief for SKU, references, ratio, duration, market, prohibited changes, and acceptance criteria. Compare the cost of usable clips, including retries and corrections, rather than only the listed per-second rate.

Kling 4.0 vs Seedance 2.5 vs MiniMax H3

Kling 4.0 emphasizes keyframe-led control and an announced 4K path. Seedance 2.5 offers the largest published reference set. MiniMax H3 is the shorter open-weight option with documented 2K output.

Choose Kling 4.0 for planned key moments or a 4K path, Seedance 2.5 for a large reference set, and MiniMax H3 for short 2K work with open weights.

How to Write Better Kling 4.0 Prompts

An 8,000-token limit does not mean every request should be long. Give each instruction a job and keep the timeline easy to scan.

Prompt formula: subject and assigned references + scene objective + timed shots or story beats + character and product actions + camera movement + lighting and style + dialogue and audio + details to preserve + details to avoid + final frame.

Ecommerce Prompt Example

Use @Image1 and @Image2 as the only references for the bottle shape, label, cap, and amber glass. Create a 20-second 16:9 skincare launch film. Seconds 0–5: macro condensation shot. Seconds 5–12: slow orbit as the bottle rises from pale limestone; preserve the label and proportions. Seconds 12–17: three drops land beside the bottle. Seconds 17–20: hold a centered end frame with negative space on the left. Warm ivory and sage palette, soft glass sounds, no added text, extra products, or logo deformation.

Use references to show identity and appearance; use the prompt for motion, timing, camera behavior, audio, and constraints. Revise one category at a time when a result fails.

Kling 4.0 API Access Through GPTProto

GPTProto provides Kling 4.0 through one account, API key, and shared balance. Open the API console to verify the live model string, modes, resolutions, and pay-as-you-go rate; use the pricing page to plan usage.