If you are building on top of Kling video models, stop scrolling past the headline and check the actual API endpoint. Indie maker leony released a breakdown on October 3, 2026, exposing a common confusion in the AI tooling ecosystem: the gap between announced model versions and what is actually callable in production. While Kling 4.0 has been officially announced, the popular third-party host Soutine is still running Kling 3.0 for live generation.

The Reality of the Soutine Landing Page

Leony created a dedicated Soutine Kling 4 model page to prevent developers from wasting credits on non-existent features. The page explicitly states that Kling 4.0 generation is not available yet, and Soutine has not published an access date for the upgrade. This is a critical distinction for infrastructure planning. If your pipeline depends on Kling 4.0 features, you are currently blocked until the host updates their backend, regardless of what the marketing copy says.

What You Can Actually Generate Today

The generator currently running on Soutine is Kling 3.0. This version supports text-to-video, start and end frames, optional original audio, and clip lengths ranging from approximately 3 to 15 seconds. Resolutions include 720p, 1080p, and 4K. Users spend credits to generate and can see cost estimates before submission. These are the hard specs for your current development environment. Do not assume you can access 4K outputs from a 4.0 model if the backend is still serving 3.0 weights.

Announced Specs vs. Early Access

The comparison on the new page treats announced Kling 4.0 capabilities as future states: longer clips claimed up to about 30 seconds, more keyframes, and multimodal references. There is also a 4.0 Flash path described as official early access, with a shorter claimed max of about 20 seconds at 720p. These are announced specs, not functional features inside Soutine right now. Leony notes that a title saying "Kling 4" is easy to misread as implying you can click generate and immediately get 4.0 results, leading to integration errors.

Key Takeaways

  • Kling 4.0 is announced but not yet live on Soutine; the current generator is Kling 3.0.
  • Soutine has not published a release date for Kling 4.0 access.
  • Current Soutine capabilities are limited to 3-15 second clips at up to 4K resolution.
  • Leony provides a reference repo soutine-kling-4 on GitHub to track the distinction.

The Bottom Line

Version numbers in AI tooling are marketing fiction until the API endpoint serves them. Treat every 'coming soon' page as a warning label, not a feature list, or you will burn credits on promises instead of pixels.