GLM / Z.ai (Zhipu AI) vs HeyGen

GLM / Z.ai (Zhipu AI) edges out HeyGen by 0.7 points (8.0 vs 7.3) -- a A-tier vs B-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for GLM / Z.ai (Zhipu AI)'s strengths, so if those categories are your priority, the lead translates.

Pricing-wise, both tools have a free tier (GLM / Z.ai (Zhipu AI) starts $0, HeyGen starts $0), so you can test either without committing. Compare what each free tier actually unlocks -- usage caps, model access, and feature gates differ a lot more than the headline price suggests, especially as both vendors have tightened limits in 2026.

By use case: pick GLM / Z.ai (Zhipu AI) when teams that need genuine mit-licensed frontier open weights with no commercial strings. Pick HeyGen when marketing teams and sales orgs who need personalized video content at scale, especially for multilingual campaigns. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in GLM / Z.ai (Zhipu AI)'s lane, the tier-list ranking and the use-case fit point the same direction; if you're in HeyGen's lane, the score gap matters less than the fit.

Bottom line: GLM / Z.ai (Zhipu AI) is the safer default for most readers, but HeyGen is competitive enough that the tie-breaker is your specific workload, not the spec sheet.