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Which AI should I use to make a talking avatar video?

A true talking avatar that reads your script for minutes still needs a dedicated tool like HeyGen. The big AIs help with the rest: Gemini and Grok can make short clips with a speaking person, and Claude writes a script that sounds natural when an avatar says it.

Which AI does this best

  1. Gemini
    AI assistantFree plan
    #1

    On a paid Google AI plan it makes 10-second clips with sound from a text prompt or a photo, including a person speaking a line you write. Good for hooks and short intros. It's not a clone of you and it can't do a long script.

    ✦ Try this prompt
    Create a 10-second vertical video: a [woman/man] in [her/his] [30s], [describe look and outfit], sitting at [setting], looking into the camera and saying in a warm, natural voice: "[one or two sentences, max 25 words]". Soft daylight, shallow depth of field, slight handheld feel, no music, no subtitles.
    Open Gemini ↗
  2. Grok
    AI assistantFree plan
    #2

    Grok Imagine turns a photo or prompt into a clip of up to about 15 seconds with sound. Paid only, 720p, and the lip-sync is hit or miss, so test before you build a series on it.

    ✦ Try this prompt
    Animate this image [attach] into a vertical video: the person looks at the camera, smiles and says "[short line, max 20 words]" in a friendly, confident voice. Subtle head movement, natural blinking, background stays still. Keep the face exactly as in the photo.
    Open Grok ↗
  3. Claude
    AI assistantFree plan
    #3

    Can't make the video, but it's the best at writing avatar scripts that sound like a person: short sentences, natural pauses, nothing that trips up text-to-speech. Paste the result straight into HeyGen or Synthesia.

    ✦ Try this prompt
    Write a [60]-second script for an AI avatar video about [topic] for [audience]. Rules: sentences under 15 words, words that are easy for text-to-speech to pronounce, mark pauses with [pause], spell out numbers, start with a hook, end with [call to action]. Then give me a version split into scenes with a suggestion for a background or B-roll for each.
    Open Claude ↗

Specialised tools

  1. HeyGen
    Free plan

    Best for creators. You can make a digital twin of yourself and translate your videos into other languages with lip sync.

    Open HeyGen ↗
  2. Synthesia
    Free plan

    Built for companies. It's made for training and onboarding videos, with lots of stock avatars and team features.

    Open Synthesia ↗

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