How to use Submagic with ChatGPT or Gemini: from script to captioned short video

Who does what: Submagic vs ChatGPT and Gemini

Submagic features as listed on its official pages on 7 Nov 2026.

So the real question is not “Submagic or ChatGPT” but which chatbot gives Submagic a better script. Auto captions only look good when the lines are short, so we wrote the caption rules straight into the prompt.

Step 1: the prompt we used (copy it)

We invented a small coffee shop, Bloom & Brew, and gave both assistants the same facts: a holiday gift box with 3 coffees and a mug, 39 euros, launch on Monday 23 November, 500 boxes. Change the facts to your own product and keep the rules.

• No line longer than 6 words: Submagic shows captions a few words at a time, so short lines stay readable on a phone.
• A hook in the first 2 seconds: viewers decide straight away whether to keep watching.
• 3 words in CAPITALS: these become the words you highlight in the caption style.
• A B-roll idea in [brackets]: you can match each one to Submagic's B-roll or film it yourself.
• “Do not add facts I did not give you”: stops invented prices, dates and claims.

Test result: ChatGPT vs Gemini

ChatGPT's script is the one we would record. It reads well aloud, and the time codes make pacing easy. Its only miss is one extra capital word, which takes seconds to fix.

Gemini's lines are clean and it followed the capitals rule exactly. But you would need to add more lines to fill 30 seconds, and fix the hook so it does not sound like the box is already on sale. Spelled-out numbers are fine for speech, but on screen “€39” reads faster than “thirty-nine euros”. If you want digits in your captions, say so in the prompt.

One test is not a ranking. Both assistants broke one rule, which is exactly why the next step matters.

Step 2: check the script before you record

• Go through your rules one by one: line length, hook, number of capital words, brackets.
• Check every fact against your brief: date, price, quantity. Look closely at verbs like “dropped”, “here” and “available”.
• Read it aloud with a timer. If it ends well before 30 seconds, ask for two or three more lines.
• Remove claims you cannot back up, such as “best coffee in town”.

Step 3: make the captioned video in Submagic

These steps follow Submagic's official feature and pricing pages (read 7 November 2026). We did not create an account for this guide, so there are no editor screenshots here.

1. Record the script vertically (9:16). Leave a short pause between lines; silence removal will tighten it.
2. Upload the video to Submagic and pick the spoken language for the captions.
3. Choose a caption style and make sure your three capital words are the highlighted ones.
4. Turn on auto zoom and silence removal. Submagic can also cut bad takes and clean up the audio.
5. Add B-roll where your script has [brackets]: from Submagic's library or your own clips.
6. Put the hook on screen as a title in the first 2 seconds.
7. Export the video, or schedule it from Submagic's built-in social media scheduler.

What it costs (official prices, 7 November 2026)

USD before tax, per member, read on Submagic's pricing page on 7 Nov 2026 from Turkey. Prices can differ by country; check the total at checkout.

The paid part of this workflow is Submagic. Writing one short script is a small request, and ChatGPT, Gemini and Claude all have free plans with daily limits (compare their free plans and prices). For Shorts, Reels and TikTok, Starter's 2-minute limit per video is usually enough.

Common mistakes

• Pasting long sentences into a caption tool. Rewrite them into short lines first, or the captions turn into walls of text.
• Letting the chatbot fill gaps. Always give the facts yourself and add “do not add facts I did not give you”.
• A hook that only works with sound. Some people watch muted, so the first line should also work as on-screen text.
• Announcing a future product as if it were out now. Gemini's hook did this in our test.