Model comparison
Compare Cara-4 and Express-3 using the same provider-sourced ai avatars & digital humans rubric. No mystery score and no invented benchmark ranking.
Facts checked September 4, 2026
Quick take
Anam's expressive realtime digital-person model for live conversations with image-based avatars, emotion direction, and bring-your-own AI components.
Default recording and enterprise zero-retention are different configurations. Confirm consent, biometric handling, storage duration, concurrency, and the full end-to-end latency before exposing an avatar to customers.
Synthesia's business-video avatar model for script-aware speech, gestures, body motion, and multilingual presenter content inside a complete editor.
A plan can include Express-3 without including every API or custom-avatar feature. Confirm video limits, avatar consent, voice rights, brand workflow, downloads, and enterprise controls.
Compare the published facts
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| AI avatars & digital humans | Cara-4 | Express-3 |
|---|---|---|
| Price basisA representative current subscription, credit, minute, or generated-second price with its route identified. | 30 free minutes; paid overages about $0.11–$0.16/min | Included in plans; paid subscriptions from $29/month |
| Delivery modeRealtime interactive streaming or an asynchronously rendered video. | Realtime interactive video | Platform-rendered presenter video |
| Source inputsImages, recordings, scripts, audio, prompts, or preset avatars accepted by the product. | Photoreal, 3D, or anime image; text/audio and connected AI stack | Script plus stock, builder, or approved custom avatar |
| Output & limitsPublished resolution, frame rate, session length, clip length, or other practical production limit. | 1152×768 landscape or 768×1152 portrait | Plan-based video minutes; standalone model limits not published |
| Languages & voicesPublished language support and whether teams can bring or clone a voice. | 70+ languages; Anam or bring-your-own audio/LLM/TTS | 160+ languages in the Synthesia platform |
| Performance controlGestures, emotion, direction, motion prompts, multi-speaker support, or similar controls. | Director Notes, expression, and emotion direction | Lip sync, gestures, body motion, and script-aware sentiment |
| Where to use itDirect API, widget, editor, conferencing integration, or other first-party access route. | API, Lab, web, Meet, Zoom, and Teams | Synthesia editor; API availability depends on plan |
How to choose
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
Anam says customer session content is not used for training unless separately agreed. Default recordings may be retained for up to 30 days, while enterprise zero-data-retention is available; verify the exact workspace settings.
Provider and API links
Synthesia says customer inputs and outputs are not used to pre-train its models. Customer-directed fine-tuning and approved custom-avatar workflows are separate; follow consent and biometric-data requirements.
Provider and API links
Frequently asked questions
Cara-4: Anam's expressive realtime digital-person model for live conversations with image-based avatars, emotion direction, and bring-your-own AI components. Express-3: Synthesia's business-video avatar model for script-aware speech, gestures, body motion, and multilingual presenter content inside a complete editor.
Consider Cara-4 when your priority is Interactive sales, support, and learning agents. Consider Express-3 when your priority is Multilingual training and internal communication. Test both with your own data and provider route before committing.
No. This comparison aligns provider-published facts for the AI avatars & digital humans category. It does not claim a universal winner or combine incompatible third-party benchmark scores.
