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What the generative video models are built for, where they fall short for teaching and explaining, and when a narrated whiteboard video is the better fit. Every model fact comes from the vendor's own pages, checked on 23 September 2026.
Generative video models turn a prompt into a short, filmed-looking clip with sound. One generation lasts seconds, not minutes: 8 seconds for Veo 3.1, 15 for Kling VIDEO 3.0 and MiniMax H3, 30 for Seedance 2.5. An explainer is usually several minutes of narration in which each picture has to match the sentence being spoken, so building one from clips means writing a prompt per shot, keeping the look consistent, stitching the clips and timing a voiceover yourself. A whiteboard generator starts from the script instead and draws a picture for each sentence as it is spoken. StrokeVideo is a whiteboard generator; it is not one of these models and does not give access to any of them.
OpenAI launched Sora 2 on 30 September 2025 as a video model with synchronised dialogue and sound effects, together with a Sora app. OpenAI's help centre now says the Sora web and app experiences were discontinued on 26 April 2026 and that the Sora API will be discontinued on 24 September 2026; its API documentation marks sora-2 and sora-2-pro as deprecated. While it ran, the API made clips of up to 20 seconds that could be extended up to six times, to 120 seconds, and it refused real people, copyrighted characters and copyrighted music. If you are choosing a tool for explainer videos today, Sora is not an option. Sources, checked 23 September 2026: https://openai.com/index/sora-2/ ; https://help.openai.com/en/articles/20001152-what-to-know-about-the-sora-discontinuation ; https://developers.openai.com/api/docs/guides/video-generation
Google DeepMind calls Veo 3.1 its leading video generation model, with audio generated natively, dialogue included, and offers it in the Gemini app, Google Flow, Google Vids, Google AI Studio and the Gemini API. The Gemini API documentation gives clip lengths of 4, 6 or 8 seconds (1080p and 4K at 8 seconds only), and a Veo video can be extended by 7 seconds up to 20 times, to at most 148 seconds. It is not free: the Gemini API pricing page says "Free Tier: Not available" for Veo 3.1, Veo 3.1 Fast and Veo 3.1 Lite, which cost from $0.05 to $0.60 per second of video depending on the variant and resolution, and the Google AI plans page lists video generation in the Gemini app under the paid Plus, Pro and Ultra plans, not the free one. Google also says that natural, consistent spoken audio, especially for short lines of speech, is still being developed. Sources, checked 23 September 2026: https://deepmind.google/models/veo/ ; https://ai.google.dev/gemini-api/docs/veo ; https://ai.google.dev/gemini-api/docs/pricing ; https://gemini.google/subscriptions/
Kling's guide to VIDEO 3.0, published 6 February 2026, says one generation runs from 3 to 15 seconds. A multi-shot mode plans the cuts and camera angles, element binding keeps the main character consistent between shots, and native audio covers dialogue in Chinese, English, Japanese, Korean and Spanish. It is also the only vendor here that makes a claim about text: the model keeps text from an uploaded image, such as a sign, caption or logo, consistent. Kling's membership page lists a free Basic plan; watermark removal, commercial use of the output and 1080p or 4K generation are listed among the paid-plan benefits. Sources, checked 23 September 2026: https://kling.ai/quickstart/klingai-video-3-model-user-guide ; https://kling.ai/app/membership/membership-plan
ByteDance Seed describes Seedance 2.5 as an audio-video model built for 30-second storytelling: up to 30 seconds in one generation, with the option to extend twice, plus editing of generated video and control through reference video. BytePlus, which sells the API, lists durations of 4 to 30 seconds at 480p or 720p, sold as prepaid plans, and up to 50 reference images, videos and audio clips. We found no free tier stated on either page. Sources, checked 23 September 2026: https://seed.bytedance.com/en/seedance2_5 ; https://www.byteplus.com/en/product/seedance
Hailuo AI's page for MiniMax H3, which it says is also called Hailuo 3, gives clips of 5 to 15 seconds at 24 frames per second with native stereo sound, output up to 1440p, and editing that can replace or remove people and objects or change the dialogue in an existing clip. There is no standing free plan on that page; what it offers is a new-user promotion, which when we checked was 3 free H3 trials and 3,000 credits for downloading the MiniMax Design app. Source, checked 23 September 2026: https://hailuoai.video/tools/minimax-h3
Three things get in the way. Length: a five-minute lesson is dozens of separate generations. Text: none of the pages we read for Sora 2, Veo 3.1, Seedance 2.5 or MiniMax H3 says how reliably words, labels or formulas written in a prompt come out readable, and Kling's claim covers text taken from an uploaded image, so test before you depend on it. Consistency and cost: keeping a character or a diagram the same across shots is a feature you set up with reference images or elements, and every second is paid for, including the takes you throw away. Use a generative model when the viewer needs to see something real or cinematic: a product in motion, a place, a short intro, a talking character. Use a whiteboard when the explanation is the point. With StrokeVideo you paste your script, or type a topic and it writes one; a picture is drawn for each sentence, traced stroke by stroke in time with the narration in 14 languages, and you download an MP4 with no watermark. 1 video a day are free, up to 4 minutes, and a plan allows up to 15 minutes per video. It does not make realistic footage, moving characters or lip-synced dialogue.
By the StrokeVideo team, which makes whiteboard videos, so read the recommendation with that in mind. Every statement about Sora 2, Veo, Kling, Seedance and Hailuo comes from the vendor's own website or documentation, opened on 23 September 2026, and the addresses are given in each section. Where a vendor's pages did not say something, such as a free tier for Seedance 2.5 or how well any model handles text written in a prompt, we say so rather than borrow figures from third-party reviews or leaderboards. These products change every few months, so tell us if something here is out of date.
| Model | Longest single generation (vendor's figure) | Free option (according to the vendor) | Readable text in the picture | Best suited for |
|---|---|---|---|---|
| Sora 2 (OpenAI) | 20 seconds in the API, extendable to 120 seconds | Discontinued: the app closed on 26 April 2026 and the API closes on 24 September 2026 | No claim about text quality found on OpenAI's pages | Not available for new work |
| Veo 3.1 (Google) | 8 seconds; extendable in 7-second steps to 148 seconds in the API | No: video generation is listed under the paid Google AI plans, and the API has no free tier | No claim about text quality found on Google's pages | Realistic or cinematic shots with sound effects and dialogue |
| Kling VIDEO 3.0 | 15 seconds | Yes, a free Basic plan; watermark removal and commercial use are paid-plan benefits | Claims to keep text from an uploaded image, such as a sign or logo, consistent; no claim for text written in a prompt | Short multi-shot scenes with a consistent character and dialogue |
| Seedance 2.5 (ByteDance) | 30 seconds, extendable twice | No free tier stated on the pages we read | No claim about text quality found on ByteDance's pages | Longer single scenes and 30-second stories guided by reference images, video and audio |
| Hailuo (MiniMax H3) | 15 seconds | A new-user promotion, not a standing free plan | No claim about text quality found on MiniMax's pages | Short clips with stereo sound, and editing people, objects or dialogue in a clip |
| StrokeVideo (whiteboard, this site) | Up to 15 minutes of narration in one video | 1 video a day, up to 4 minutes, no watermark | Short labels are drawn into the pictures and a drawn word can come out wrong, so check the ones that matter | Lessons, explainers and training from a script, narrated in 14 languages |
Not any more. OpenAI closed the Sora app and website on 26 April 2026 and says the Sora API closes on 24 September 2026. While it ran, one generation was at most 20 seconds, so a lesson meant stitching many clips and adding the narration yourself.
Not according to Google's own pages on 23 September 2026. The Gemini API pricing page lists no free tier for Veo 3.1, Veo 3.1 Fast or Veo 3.1 Lite, and the Google AI plans page lists video generation in the Gemini app under the paid Plus, Pro and Ultra plans. Offers change, so check Google's plans page.
It depends on what the viewer needs to see. For a realistic scene, a product shot or a cinematic intro, a generative model such as Veo 3.1, Kling, Seedance or Hailuo is built for that. For explaining a process, a concept or a lesson over several minutes of narration, a whiteboard generator that draws a picture for each sentence of your script is quicker to make and easier to follow. Some people use both: a short generated clip to open, and a whiteboard for the explanation.
Per generation, according to the vendors: Veo 3.1 up to 8 seconds, Kling VIDEO 3.0 and MiniMax H3 up to 15 seconds, Seedance 2.5 up to 30 seconds. Veo and Seedance can extend a clip; in the Gemini API a Veo video can reach 148 seconds. A StrokeVideo whiteboard video can run up to 15 minutes of narration in one go.
None of the official pages we read for Sora 2, Veo 3.1, Seedance 2.5 or MiniMax H3 says how reliably text written in a prompt comes out readable. Kling's guide says VIDEO 3.0 keeps text from an uploaded image, such as a sign or a logo, consistent. If your explainer depends on labels, formulas or captions, test first, or add the text in an editor afterwards.
No. StrokeVideo does not use, and does not give access to, any of the models on this page. It makes one kind of video: a hand-drawn whiteboard explainer, drawn stroke by stroke in time with the narration.
