Canonical page: https://mixerai.org/en/knowledge/compare/kling-4-0-flash-vs-kling-avatar/ Prices on this page are live: current values come from https://mixerai.org/api/knowledge/prices?lang=en. A dash means the value did not load. [Mixer AI](https://mixerai.org/en/) › [Knowledge Base](https://mixerai.org/en/knowledge/) › [Comparison](https://mixerai.org/en/knowledge/compare/) › Kling 4.0 Flash vs Kling AI Avatar: specs and price # Kling 4.0 Flash vs Kling AI Avatar: specs and price Both models are available in the current Mixer AI catalog, but they solve different jobs within the same media type. This page therefore does not label one as universally better: the table shows compatible inputs, limits and pricing, while the visual section separates valid A/B checks from different workflow stages. [Try it on Mixer AI](https://mixerai.org/en/#/canvas?dl=kb_kling-4-0-flash-vs-kling-avatar) ## Key differences Kling 4.0 Flash: A lighter Kling 4.0: clips of 3–20 seconds in 720p from text and references, or from a start frame. Kling AI Avatar: A speaking or singing portrait from one photo and a finished audio track. ## Specifications | Spec | Kling 4.0 Flash | Kling AI Avatar | Model variants | Flash | Standard / Pro | Generation modes | from text / from first frame / from references | — | First frame | Yes | No | Input photos | up to 7 | 1, required | Input videos | up to 5 | No | Input audio files | No | 1, required | Output audio | — | Yes | Minimum duration | 3 s | — | Maximum duration | 20 s | — | Resolutions | 720p | No separate selector | Aspect ratios | 9:16 / 16:9 / 1:1 / auto / 21:9 | Follows the input | Prompt limit | 8,000 characters | 5,000 characters | Price, 1 s · 720p | — coins | — coins · Standard ## What to compare visually Do not force tools with different jobs into the same test. First compare the inputs each one accepts and the output it is meant to produce. If they share a workflow, run an A/B test on the same source; otherwise judge each at its own stage: generation, Motion Control, avatar creation or upscaling. ## What to inspect with Kling 4.0 Flash A lighter Kling 4.0: clips of 3–20 seconds in 720p from text and references, or from a start frame. - Text and references: a prompt up to 8000 characters, up to 7 photos and up to 5 videos totaling up to 20 seconds; the Video sound switch keeps the sound of reference videos. - Start frame: one optional photo; without it choose 16:9, 9:16, 1:1 or 21:9, with it the format follows the photo. - Flash gives 720p and up to 20 seconds only; choose Kling 4.0 for 1080p and 30 seconds. - Start frame mode accepts no video: videos belong to references mode only. ## What to inspect with Kling AI Avatar A speaking or singing portrait from one photo and a finished audio track. - One photo and one audio file are required. - Standard outputs 720p; Pro outputs 1080p. Duration follows the audio, up to 300 seconds. - Typed text cannot replace the audio file. - A strong profile, hidden face or multiple voices can weaken lip synchronization. ## How to run a fair comparison - Identify the workflow stage first: create new media, transfer motion, make a talking avatar, or improve an existing file. - Compare specifications only where they mean the same thing: accepted inputs, limits, available resolution and the real price of the needed mode. - If a shared workflow exists, use the same source. If it does not, do not infer visual quality from non-equivalent outputs. - Tools for different stages can be used sequentially rather than as substitutes. ## Sources Prices, availability and specifications come from the Mixer AI catalog. This is not an independent test: try both models on the same task before choosing. - [Prices and availability — Mixer AI catalog](https://mixerai.org/knowledge/catalog.json) ## What we compare [ Kling 4.0 Flash A lighter Kling 4.0: clips of 3–20 seconds in 720p from text and references, or from a start frame. ](https://mixerai.org/en/knowledge/video/kling-4-0-flash/) [ Kling AI Avatar A speaking or singing portrait from one photo and a finished audio track. ](https://mixerai.org/en/knowledge/video/kling-avatar/) ## FAQ How should I compare Kling 4.0 Flash and Kling AI Avatar fairly? Compare purpose and inputs first. Test any shared workflow on the same source; evaluate different workflows separately by output quality, constraints and the price of that stage. Are both models available in Mixer AI? Yes. Both tools are in the current Mixer AI catalog. They are often used one after the other: for example, one model makes the video and another improves the file. Which model is better? There is no single winner. First rule out the model that lacks the duration, first or last frame, sound or resolution you need, then compare clips on your own scene. The table highlights only measurable differences. ## See also [Kling 4.0 Flash vs Midjourney Video: specs and price→](https://mixerai.org/en/knowledge/compare/kling-4-0-flash-vs-midjourney-video/) [Kling 4.0 vs Kling AI Avatar: specs and price→](https://mixerai.org/en/knowledge/compare/kling-4-0-vs-kling-avatar/) [Kling 2.1 vs Kling AI Avatar: specs and price→](https://mixerai.org/en/knowledge/compare/kling-2-1-vs-kling-avatar/) [Kling 2.5 Turbo Pro vs Kling AI Avatar: specs and price→](https://mixerai.org/en/knowledge/compare/kling-2-5-turbo-vs-kling-avatar/) [Try it on Mixer AI](https://mixerai.org/en/#/canvas?dl=kb_kling-4-0-flash-vs-kling-avatar)