FAQ
When did Kling 4.0 come out?
The full Kling 4.0 model launched on 2026-10-15, per launch coverage by Sina Tech; the lightweight Kling 4.0 Flash opened small-scale testing on 2026-09-28 (both read 2026-10-16).
Is Kling 4.0 free?
Kling's official credits policy describes no universal free tier — credits come from purchases, membership benefits or promotions, and failed generations refund (kling.ai/docs/point-policy, read 2026-10-16). A third-party guide reading Kling's pages on 2026-09-09 describes a free tier with a mandatory watermark and no 1080p/4K output; verify in-app before relying on it.
Is the Kling 4.0 API available?
No. Kling's developer pricing page lists only Kling 3.0 and 3.0 Turbo, and launch coverage says 4.0 API access is "coming soon" for enterprise customers and developers (klingai.com/dev; Sina Tech, read 2026-10-16).
What is the difference between Kling 4.0 and 3.0?
Duration and control: 4.0 generates up to 30 seconds natively, outputs up to 10-bit HDR with 4K/1080p/21:9 support, adds stereo audio with better lip-sync, and accepts up to 15 reference combinations plus 10 keyframes (guancha.cn; ZOL, read 2026-10-16). 3.0 already had native audio and element-consistency control (official 3.0 guide, read 2026-10-16).
How much does a Kling video cost?
Through the API, Kling 3.0 bills $0.084–$0.42 per second depending on resolution and audio — a 5-second 1080p clip with audio is $0.84 (klingai.com/dev, read 2026-10-16). Consumer use runs on credits at an official rate of $1 = 66 credits. 🔴 Kling 4.0 API pricing is not published yet.
Can I use Kling 4.0 on fal.ai, Replicate or other platforms?
Not as of 2026-10-16. fal.ai's model list, Viralance's pricing page and Medeo's model list all still top out at Kling 3.0 (or older), and Replicate's Kling page could not be found that day (all read 2026-10-15/16).
What is Kling 4.0 Flash?
The lightweight Kling 4.0 variant that opened small-scale testing on 2026-09-28, ahead of the full model (IT Home, read 2026-10-16). Kling has not published an itemized Flash-vs-full comparison, so treat "faster and cheaper" as positioning rather than documented spec.
Do Kling credits expire?
Yes, by type: purchased credits last 2 years, regular membership credits 1 month, 7-day membership credits 7 days, and daily login credits reset at 24:00 (kling.ai/docs/point-policy, read 2026-10-16).
The short version
Kling 4.0 launched on 2026-10-15 with 30-second native generation, up to 10-bit HDR (4K/1080p/21:9), stereo audio and up to 15 references plus 10 keyframes per task — but it is official-app-only for now: the API still prices Kling 3.0 at $0.084–$0.42 per second, and fal.ai, Viralance and Medeo all still list 3.0 as their newest Kling (all read 2026-10-16). Credits run at an official $1 = 66 with failed generations refunded. If your workflow needs API access today, draft on 3.0 and keep 4.0 for the final HDR pass in the app.
Sources
- kling.ai (read 2026-10-16)
- klingai.com/dev (read 2026-10-16)
- kling.ai/docs/point-policy (read 2026-10-16)
- fal.ai/models/fal-ai/kling-video/v3/pro (read 2026-10-16)
- app.klingai.com Kling 3.0 Omni model user guide (read 2026-10-16)
- guancha.cn/CaiJing/2026_10_16_904556.shtml (read 2026-10-16)
- ai.zol.com.cn/1260/12607971.html (read 2026-10-16)
- Sina Tech launch report via baijiahao.baidu.com (read 2026-10-16)
- IT Home pre-launch report via baijiahao.baidu.com (read 2026-10-16)
- createvision.ai/zh/guides/kling-ai-pricing-2026 (secondary source, read 2026-10-16)
- replicate.com (read 2026-10-16)
- viralance.com/pricing (read 2026-10-15)
- medeo.app model list and pricing (read 2026-10-15)
