Kling 4.0 vs Gemini Omni 1.2 Flash: Which AI Video Model Fits Your Shot?

Published November 11, 2026 · Last checked November 11, 2026 against Kling's 4.0 User Guide and Google's Gemini Omni 1.2 Flash announcement.

Short answer: Pick Kling 4.0 when you need one long, directed take: up to 30 seconds, up to 10 keyframes and up to 15 reference assets. Pick Gemini Omni 1.2 Flash when you want fast 15-second drafts that you then change by chatting, at a published API price of $0.07 per second at 720p. This is a spec comparison, not a hands-on test.

Kling 4.0 vs Gemini Omni 1.2 Flash at a glance

Last verified: November 11, 2026.

What changed with Gemini Omni 1.2 Flash on November 5?

Google raised the maximum clip length from 10 seconds to 15 seconds and cut the 720p API price by 30%, to $0.07 per second. The release also added reference inputs for characters, products and styles, short motion clips and audio cues, plus editing across the full 15-second clip. Google says it is still working on fast sports action, rapid script changes and complex physics.

That makes it the newest direct rival to Kling 4.0, which launched three weeks earlier with a 30-second single pass.

How long can each clip be?

Kling 4.0 generates 3 to 30 seconds in one pass. Gemini Omni 1.2 Flash generates 3 to 15 seconds. Both let you set the duration in one-second steps.

If your scene needs more than 15 seconds without a cut, Kling 4.0 is the only one of the two that does it in a single generation. For the details, see our guide to Kling 4.0 video length. Kling also lists a Video Extension feature that will stretch a clip to as long as two minutes, but it is marked as coming soon.

Which model gives you more control over a shot?

They take opposite approaches.

Kling 4.0 is built for planning a shot before you generate it:

• First-frame and last-frame control.
• Up to 10 keyframes that pin specific moments. See Kling 4.0 keyframes.
• Omni Reference with up to 15 assets in total: up to 10 images, up to 5 videos, up to 3 voice profiles and up to 7 elements. Our Kling 4.0 Omni Reference guide explains the limits.
• Camera direction written into the prompt.

Gemini Omni 1.2 Flash is built for fixing a shot after you generate it. You keep talking to the model: swap a product or a background, change the lighting or the weather, or switch the aspect ratio, without starting over.

Kling 4.0 also has an editing mode. It accepts up to 5 clips and can add or remove elements, replace characters or scenes and change the style. The difference is that Google's editing runs as a conversation across several turns.

How sharp is the output?

Kling 4.0 outputs 720p, 1080p and 4K, according to Kling's User Guide, which marks 10-bit HDR as coming soon. Gemini Omni 1.2 Flash creates drafts at 360p or 720p and then upscales a finished clip to 1080p or 4K.

Two cautions before you plan a 4K delivery:

1. The resolutions you can pick depend on the platform you use. Check the options in the generator before you submit.
2. An upscaled 4K file and a 4K file generated directly are not the same thing. Compare a short test clip of your own scene.

For the Kling side, see Kling 4.0 4K and 10-bit HDR status. If speed matters more than resolution, Kling 4.0 Flash is the lighter Kling option: 3 to 20 seconds at 720p.

How does audio compare?

Both models generate sound with the video.

• Kling 4.0: two-channel stereo, with speech in languages that include English, Chinese, Japanese, Korean, Spanish, Portuguese, German, French and Hindi. You can add up to 3 voice profiles as references.
• Gemini Omni 1.2 Flash: Google highlights smoother dialogue, better matching of speech to mouth movement and multi-speaker conditioning. Audio cues can be used as references.

Neither company has published a benchmark that compares the two on audio quality.

What does each one cost?

Google publishes one clear number: $0.07 per second at 720p on the Gemini API. A 15-second clip at that rate costs $1.05, and a 10-second clip costs $0.70. Google has not listed per-second prices for other resolutions in the announcement. Google Vids offers 15-second clips at no extra cost to Google account and Workspace users.

Kling's API lists Kling 4.0 at $0.157 per second at 720p and $0.235 at 1080p, so a 15-second 720p clip costs about $2.36, against $1.05 on Gemini Omni 1.2 Flash. On other platforms the cost depends on the plan. On Kling4.tv, new accounts receive 40 credits, enough to generate one video. The generator shows the exact credits for your model, resolution and duration before you submit, and the plans are on the Kling AI pricing page.

Where can you use each model?

Gemini Omni 1.2 Flash: the Gemini API and Google AI Studio, Vertex AI, Flow, Google Vids and Google Ads asset studio. In the Gemini app it is rolling out to Google AI Ultra subscribers.

Kling 4.0: Kling's own app, and third-party platforms. Kling connects to AI agents through its MCP server and command-line tool. Kling 4.0 and Kling 4.0 Flash are also available through Kling's developer API.

You can also run Kling 4.0 in your browser on Kling4.tv: start from a text prompt or an image. The model menu on Kling4.tv also includes a Gemini Omni Flash option, so you can try both from one account; check the model label in the menu before you submit. Kling4.tv is an independent site and is not affiliated with Kuaishou, Kling AI or Google.

Which should you choose?

Choose Kling 4.0 if:

• The shot runs longer than 15 seconds without a cut.
• You need specific moments to land at specific times.
• You are combining many references: characters, products, footage and voices.

Choose Gemini Omni 1.2 Flash if:

• You make many short drafts and refine them by describing changes.
• You already work in Google's tools, such as Vids, Flow or Vertex AI.
• You need a fixed, published per-second price for budgeting.

If you are still deciding between Kling and other models, our Kling 4.0 vs Seedance 2.5 comparison uses the same format.

What is still coming soon or not announced?

• Kling 4.0: 10-bit HDR output and Video Extension up to two minutes are marked as coming soon. The API does not offer 4K yet.
• Gemini Omni 1.2 Flash: no per-second prices for resolutions other than 720p in the announcement, and no stated maximum number of reference images.
• No independent benchmark compares the two models' visual quality.

FAQ

Is Kling 4.0 better than Gemini Omni 1.2 Flash?

Neither is better at everything. Kling 4.0 offers longer clips and tighter shot planning. Gemini Omni 1.2 Flash offers conversational editing and a published low price. No public benchmark ranks their image quality.

Can Gemini Omni 1.2 Flash make a 30-second video?

Not in one generation. Its limit is 15 seconds per clip. Kling 4.0 generates up to 30 seconds in a single pass.

Which one is cheaper?

Gemini Omni 1.2 Flash, on the API. Google lists $0.07 per second at 720p; Kling's API lists Kling 4.0 at $0.157, so a 15-second 720p clip costs about $1.05 against $2.36. On other platforms the cost depends on the plan.

Do both models generate audio?

Yes. Kling 4.0 outputs two-channel stereo with multilingual speech. Gemini Omni 1.2 Flash generates dialogue and supports multiple speakers.

Are videos from these models watermarked?

Google adds an invisible SynthID watermark to every Gemini Omni 1.2 Flash output. For Kling 4.0, visible watermarks depend on the platform and plan you use.

Where do these facts come from?

• Kling 4.0 User Guide, Kling AI. Clip length, resolutions, keyframes, Omni Reference limits, audio, editing and coming-soon items.
• Kling AI Officially Launches Next-Generation Kling 4.0, Kuaishou investor release, October 16, 2026. Launch date, MCP and CLI, API and extension plans.
• Video API pricing, Kling AI. Kling 4.0 API prices per second by resolution.
• Introducing Gemini Omni 1.2 Flash, Google, November 5, 2026. Clip length, resolutions, references, editing, price, availability and SynthID.

All facts were checked on November 11, 2026. Both products change often, so confirm the current options in the tool you use.

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Plan one 30-second shot with keyframes and references, check the credit estimate, and generate it in your browser.

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