Why Your AI Avatar Isn't the Engine You Picked

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What I Was Actually Testing

I picked "Avatar IV" — the engine HeyGen describes as having real, adaptive gestures. I generated a video. Then I checked the tag on the finished clip.

It said Avatar III.

I did it three times, on HeyGen's free tier, with the exact same result every time: pick the engine with real motion, get the one described as "applies lip sync" instead.

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The Free Tier, Honestly

HeyGen's free plan gives you access to 500+ public avatars — one of them, "Annie," alone has 57 different outfit and look variations, which is genuinely more generous than most AI tool free tiers. You also get 3 video generations a month, capped at 1 minute each, 720p, with a watermark you can't remove without upgrading to the $24-29/mo Creator plan.

All of that is disclosed clearly on their pricing page. No complaints there — this part is exactly what it says it is.

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The Engine Picker

Before generating anything, HeyGen makes you choose which underlying engine renders the video:

Avatar V — "Character consistent motion style that adapts to script"
Avatar IV — "Generic motion that adapts to script"
Avatar III — "Applies lip sync"

These aren't just version numbers. They're described as genuinely different techniques — III sounds like a simpler, mostly-static lip-sync-only method, while IV and V both promise actual body and gesture motion tied to what's being said.

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Three Tests, Same Result

I selected Avatar IV from the picker, typed a short script, and generated. Video finishes, I check the project tag underneath it.

Avatar III.

Thinking it might be a one-off, I ran it again — same result. A third time, to be sure — same result again.

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What This Doesn't Mean

I want to be careful here, because it's easy to overclaim this kind of thing. I don't know why this happens — whether it's an undisclosed free-tier restriction, a bug, or something else entirely. I don't have backend access, and I'm not going to guess at intent I can't verify.

What I can tell you is only what I directly observed: the engine you select in the picker isn't necessarily the engine that renders your video.

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The One Thing You Can Actually Do

Check the tag underneath your video after every generation. It's the only way to know which engine you actually got — the picker itself won't tell you after the fact.

If you've generated anything on HeyGen's free tier, it's worth checking your own past exports. I'd genuinely like to know if this is consistent across accounts or just something specific to mine.

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