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KuaishouAlibabaVideo model matchup

Kling 4.0 Flashvs.Wan 2.1 Plus API

Neither Kling 4.0 Flash nor Wan 2.1 Plus API has an LMArena rating yet.

Kling 4.0 Flash longer
Longest clipSeconds per request
20 s

Kling 4.0 Flash

5 s

Wan 2.1 Plus API

Choose Kling 4.0 Flash for

long clips

Choose Wan 2.1 Plus API for

No clear advantage

Where is the difference?

Longest clipKling 4.0 Flash longer20 s to 5 s
Resolutionsame resolution720p to 720p

Bar length shows the gap: for ratings full width from 60 points, for price from four times as much, for clip length from 20 seconds. Solid means clearly ahead, hatched slightly ahead, a thin grey bar level.

All data side by side

The better value is bold. For ratings only when the gap is clear.

MetricKling 4.0 FlashWan 2.1 Plus API
Output
Resolution720p720p
Longest clip20 s5 s
Soundgenerated by the modeln/ano
Access
RouteswebAPI
ReleasedSep 28, 2026n/a
StatusavailableRestricted web access for Ultra Yearly subscribers; no public API slug confirmedavailable

Prices: public API price of the documented standard configuration; resolution and sound can change it

Is there a better choice?

Best model for text to videoGemini Omni 1.1 Flash

Text to video 1,516, Place 1 of 23. $0.51 per 5 s clip.

Kling 4.0 Flash vs. Gemini Omni 1.1 Flash

Sources and method

Show 2 sources and the method

Ratings come from the LMArena: people see two videos for the same prompt without knowing which model made them and pick the better one. Many such picks add up to a rating, higher is better. Text to video and image to video are separate lists and are never added together.

“Ahead” means one model stays clearly higher even with the rating’s uncertainty. “Slightly ahead” means its value is higher but the gap is not certain yet. Otherwise both count as level. Places count only the models of our comparison.

Prices and clip lengths come from the providers’ documentation. From a factor of 1.25 a model counts as cheaper or longer, below that as about the same.

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