Kling 4.0 reference guide: prompts, inputs and first-clip checks

Magic Hour publishes this guide and offers Kling-based video creation. The cover is an editorial illustration, not a Kling-generated sample. We have not run a retained Kling 4.0 quality benchmark for this article, so the examples below are reusable briefs, not measured output claims.

What changed with Kling 4.0?

Kling's official October 26 update dates the launch to October 15, 2026. It describes 3–30-second generation, Omni Reference with up to 15 combined assets, and up to 10 keyframe images. These are provider specifications, not a promise that every partner exposes the same controls.

Source: Kling's official model update.

Use this distinction when comparing screenshots, tutorials or API examples. A feature shown in Kling's own studio may be missing, limited or exposed differently in another service. Choose the surface that supports the specific input and revision you need.

Which controls apply in Magic Hour?

Magic Hour's current source configuration supports Kling 4.0 for video creation with image and video references and optional audio. Its configured resolutions are 720p and 1080p, and its reference configuration allows up to ten images and one video. It does not configure 4K output or the provider's full fifteen-asset allowance. Both configured resolutions require a paid tier. Optional generated audio does not mean you can upload an audio reference; that input is not enabled in the current configuration.

Treat the live form as the final check for your account. A resolution can depend on access, the selected mode and the other inputs. Native keyframes and a first/end-frame workflow also should not be treated as interchangeable controls.

Before starting, inspect the selected model, input mode, available resolution, duration, aspect ratio and credit estimate. If the setting you need is absent, change the production plan or use a surface that exposes it. Adding a capability request to the prompt does not create an unsupported control.

Open Magic Hour's Kling 4.0 creation flow.

Build a reference set with one job per asset

A reference is useful when you can explain what it contributes. Separate these roles in your brief:

- Subject: the person, character or object that should remain recognizable.

- Environment: the location, background or spatial arrangement.

- Look: lighting, palette, material or illustration treatment.

- Motion: the action or camera behavior you want to communicate.

Remove references that fight over the same decision. For example, two incompatible product angles or lighting directions make the desired result harder to judge. Start with the minimum useful input set and add a reference only when it resolves a specific ambiguity.

For a brand or product shot, write down which details must remain authoritative. Packaging text, proportions, colors and physical features need their own review. A visually attractive result is not proof that a product is represented accurately.

A prompt structure for a controlled first clip

Write the brief in five parts: subject, action, camera, environment and preservation constraints. Describe what happens over time. Avoid stacking several disconnected scenes into the first attempt.

Example brief, not a tested output:

The useful feature of this prompt is its reviewability. You can check whether there is one cyclist, whether the direction remains consistent, whether the camera tracks, and whether the scene changes unexpectedly. It gives the next revision a concrete target.

First-clip workflow

1. Define the deliverable. Write down the intended use, aspect ratio and one action the audience must understand. Decide whether the clip stands alone or needs room for an edit.

2. Prepare the inputs. Use permitted images or footage. Choose a clear subject and crop deliberately. Identify each reference's job before uploading it.

3. Select the exact model. Confirm Kling 4.0 in the creation form rather than assuming the last-used model remained selected. Inspect the settings and displayed estimate.

4. Generate a bounded first attempt. Keep the scene and movement simple enough that you can diagnose a failure. The longest available duration is not automatically the best first test.

5. Review the whole clip. Watch once at normal speed, then inspect the frames around turns, contact, cuts or sudden movement. Review audio separately when present.

6. Change one cause at a time. If framing is wrong, revise the camera instruction before adding more action. If identity drifts, simplify competing references before changing the lighting and scene together.

7. Save the accepted version. Retain the source inputs, prompt, model, settings and selected output. Use that record when making the next shot or explaining a client revision.

Three reusable briefs

Product reveal

Check label text, reflections and edge geometry. Replace inaccurate details before publishing commercial work.

Character action

Check hand contact, object continuity and the transition between reaching and opening. If the sequence is unclear, start with only the reach.

Establishing shot

Check architecture, lettering and whether the camera path introduces invented objects. These briefs are starting points for review, not guaranteed preservation recipes.

How to diagnose a weak result

If the camera moves differently from the brief, reduce the request to one camera behavior and state what should stay stationary. If several actions compete, split the idea into separate shots and finish the sequence in an editor.

If a subject changes appearance, compare the result with the original reference and identify the first point of drift. Reduce conflicting style or character references. Preserve the last approved result rather than repeatedly revising an already damaged branch.

If a physical interaction fails, isolate that interaction. A hand picking up a product is a different review problem from a landscape pan. Inspect contact, object shape and continuity rather than judging only a pleasing opening frame.

If audio is wrong, review pronunciation, timing, background sound and intelligibility separately. Keep visuals and sound as separate acceptance decisions even when generated together.

Budget for accepted clips

Compare the displayed cost at the same model, duration, resolution, audio and reference settings. Record attempts and accepted outputs separately. A lower cost per attempt can still be a higher cost per usable clip when a brief needs many revisions.

For example, if three attempts are required for one accepted shot, retain all three attempt costs in the project budget. Include manual editing, replacement audio or compositing when those steps are necessary for delivery.

For current plan and API distinctions, use the existing Kling pricing guide. This article does not introduce a second pricing owner or assume that studio subscriptions and API billing share an allowance.

When should you keep an older model workflow?

Keep an existing workflow when its accepted outputs, controls and cost already satisfy the brief. A new model name is a reason to evaluate a specific improvement, not evidence that every shot will be better.

If you need the earlier controls explained, the Kling 3.0 reference guide remains separate. For a different production choice, the existing Kling 3.0 versus Seedance 2.5 comparison covers that version pair. Do not apply its conclusions to Kling 4.0 without comparable evidence.