Kling 4.0 explained: what shipped, what is still coming, and what to use now

What Kling 4.0 is as of October 26, 2026#

Kling 4.0 has launched, but its product launch and public API availability are separate questions. Kuaishou's announcement (Opens in a new tab), datelined October 16, says it launched on October 15, 2026, emphasizing steadier motion, single-pass video up to 30 seconds, and Omni Reference control (vendor-reported). This article checks those claims as of October 21, 2026; it is a planning guide, not an independent output benchmark.

For a project starting today, decide whether you need a longer shot, more reference control, or an automated pipeline. Those needs lead to different choices. Kling 4.0 is not available on OmniArt as of October 26, 2026. You can still develop the shot in OmniArt's video workspace with the available models below, without scheduling work around an unannounced integration date.

What shipped on October 15#

The following are launch specifications in the Kling 4.0 User Guide (Opens in a new tab), checked October 21, 2026. They are vendor-reported capabilities, not our test results. The baseline column uses OmniArt's current catalog, checked the same day; a dash means we are not asserting a directly comparable limit.

The reference limits share a total budget; the category maxima cannot simply be added. The guide also lists voice profiles and video elements within that budget. Build a reference set around each asset's job: identity, composition, movement, or sound. Adding more inputs without clear roles can leave the direction ambiguous.

Tokens and characters are different units, so the prompt row is not a mathematical multiplier. Use extra input space for causal order, camera direction, and constraints. Repeating the same instruction in several ways can create conflicts rather than resolve them.

What is still coming soon#

This status table separates launch claims from promises and unresolved availability. Sources were checked on October 21, 2026; API and fal entries were rechecked October 26, 2026. “Shipped” below means described as launched by the vendor, not independently exercised by OmniArt.

The press release's extension headline can sound like an available feature if read alone. Its body uses future tense. Likewise, a resolution appearing in a parameter table does not settle the conflicting rollout language elsewhere in the guide. For delivery planning, confirm the actual account controls before committing to an HDR or 4K master.

These distinctions matter when a client needs a repeatable pipeline. A web interface can be useful for exploration while an integration is still unavailable. Keep your shot brief, source assets, and editing plan portable, and make the delivery format an explicit acceptance condition.

Kling 4.0 API status: what we could confirm#

Kling 4.0 is now callable through fal's API (platform-reported, as of October 26, 2026). In its October 23, 2026 announcement (Opens in a new tab), fal described Kling 4.0 as "publicly available on fal, with API access open to all customers". Its public model page (Opens in a new tab) lists prices and its API documentation (Opens in a new tab) provides authenticated request examples. We checked those public pages without submitting a generation. This availability is through fal; Kling 4.0 is still absent from OmniArt's catalog.

Kling announced rollout on October 22 (Opens in a new tab) (vendor-reported). Its official documentation index (Opens in a new tab) now lists Kling 4.0 text-to-video, image-to-video, Omni video, element and voice APIs, with a published text-to-video request contract (Opens in a new tab). As of October 26, 2026, Kling's own pricing page (Opens in a new tab) still says access is not yet available and rates are previews. That notice concerns Kling's direct service, not fal; direct-service account access was not tested here.

Kling 4.0 preview API prices#

The following are vendor-reported preview prices from Kling's own pricing page (Opens in a new tab), checked October 26, 2026. They do not confirm final billable rates for Kling's direct service. That page still says requests cannot use them before launch and final pricing will be announced separately; fal's current dollar rates are discussed below.

For video input, multiply the rate by input plus output seconds when the input is longer; otherwise multiply it by twice the output seconds. Input includes reference clips and video character elements. The lower video-input rate therefore does not necessarily mean a cheaper output.

Preview calculation, not a bill: 10 output seconds with 5 input seconds at 720P would be 0.6 × 10 × 2 = 12 Units, or $0.094 × 10 × 2 = $1.88. With 20 input seconds it would be 18 Units, or $2.82. Without video input, 10 seconds at 1080P would be 15 Units, or $2.35. USD totals use each row's dollar rate, not a derived Unit conversion.

fal's model page (Opens in a new tab) lists current API rates of $0.157/s at 720p and $0.235/s at 1080p without video input, or $0.094/$0.141 with video input (platform-reported, checked October 26, 2026). Its billing rule uses input plus output duration, with a minimum of twice the output; these dollar rates match Kling's preview table. fal's hub (Opens in a new tab) still says API coming soon, while its model and API pages (Opens in a new tab) list rates and request examples. Follow the model/API pages for fal access and billing.

MCP/CLI integration remains a separate claim in the launch announcement. Before building, recheck the pricing page, API index and release notes (Opens in a new tab) for identifiers, authentication and account access.

Kling 4.0 vs Kling 3.0 / O3: what changes in practice#

For a continuous scene, the useful question is where a cut would be acceptable. A person crossing a room and revealing an object may benefit from uninterrupted geography. An advertisement built from separate detail shots may be easier to direct and revise as an edit. More available duration does not require a longer take.

Reference control is a different decision. Assign a stable image to appearance and a motion clip to movement; remove assets that compete over lighting or camera position. Prepare reference material you have permission to use. A larger input budget is useful when every asset adds distinct information, but it is not a guarantee of identity consistency.

Keyframes describe intended moments, while prose connects them. Write down the beginning, the visible change, and the ending before adding intermediate beats. Then review whether the camera could physically travel between those states. This planning helps even when you later switch models.

We have not checked an independent Kling 4.0 benchmark for this article. The specifications support workflow hypotheses, not a quality ranking against O3, Kling 3.0, or Seedance 2.5. Review your own outputs for geometry, identity drift, timing, and contact between objects before selecting a final take.

What you can do on OmniArt today#

As of October 26, 2026, OmniArt's public catalog offers Kling O3 and Kling 3.0 in Standard, Pro, and 4K variants, with 3–15 second generation ranges. Reference mode belongs to O3; do not assume Kling 3.0 has the same controls. See Kling O3 Pro, Kling 3.0 Pro, and our O3 / 3.0 workflow comparison.

For a longer single take, Seedance 2.5 exposes 4–30 seconds and 480p/720p/1080p in OmniArt's catalog as of October 26, 2026. Its reference limits are up to 30 images, 10 videos, and 10 audio inputs, within a combined 50-asset budget. Audio references are inputs; the workspace does not expose an audio-generation toggle for this model. These are current OmniArt settings, not Kling 4.0 equivalents or quality claims.

The following are starting prompts, not demonstrated outputs. In the workspace, select the displayed settings and inspect the generation total before submitting. Prompt cards copy the text and open the model; their parameter labels do not automatically apply settings or attach references.

Plan a longer continuous take#

Select Seedance 2.5, video mode, 24 seconds, 720p, and 16:9. These are suggested settings inside the catalog range checked October 26, 2026. Keep the camera path simple enough that you can inspect continuity across the whole shot.

If an object changes shape midway, simplify the interaction before extending the story. For a broader editing plan, use the long-form AI video workflow; for input roles, read the Seedance reference prompting guide.

Build a reference-led O3 shot#

Select Kling O3 Pro and reference mode. Upload a product image and a workshop image yourself, then choose 8 seconds and 1080p. This proposed setup fits the O3 catalog checked October 26, 2026. The card does not include those images; it is a brief you can adapt to your own authorized material.

Review the product at the start, during the turn, and after placement. If the brief needs several locations or independent actions, split it into separate shots and assemble the edit. That keeps today's work moving while Kling 4.0 access remains a separate future decision.