Value of engine.type, not a universal model parameter.
Access
POST https://api.heygen.com/v3/videos; engine.type selects the engine. Poll GET /v3/videos/{video_id}.
Regions
No model-specific processing or storage region guarantee established.
batchDelivery
Poll /v3/videos/batches/{batch_id} for per-item status. Optional callback runs once all items are terminal; batch creation is limited to 30 requests/minute.Source for batchDelivery (opens in a new tab)
Video MP4/WebM up to 100 MB below 2K; image JPG/PNG up to 50 MB below 2K. Generic asset uploads have a separate 32 MB cap unless direct upload is used.Source for inputResources (opens in a new tab)
Public API help-center table reviewed October 14, 2026. API and Studio plans are separate; pay-as-you-go credits expire after 12 months.Source for pricingSource (opens in a new tab)
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 14 Oct 2026
Category
Usage
Rate
Unit
Avatar video generation
Photo Avatar1
$2.31
minute of generated video
Avatar video generation
Digital Twin1
$4.83
minute of generated video
Avatar video generation
Studio Avatar1
$4.83
minute of generated video
Rate conditions
Public self-serve API tariff for this avatar type and engine, charged by actual generated seconds. Application subscription credits, legacy plans and Enterprise contracts are separate. No unlisted resolution surcharge inferred.
Privacy policy distinguishes customer-directed processing from HeyGen controller purposes. Applicable plan terms, DPA and Enterprise agreements govern training use. No blanket zero-retention or no-training promise inferred. Deleted information can remain in disaster-recovery backups for 60 days.
Caching can reuse earlier input processing. Availability, lifetime and billing depend on the endpoint. A cache hit still generates a new response.
01 / INITIAL INPUTProcess & retain
The system processes eligible input and retains reusable state.
02 / LATER REQUESTCheck available state
Reuse depends on matching input, session state and the cache policy.
03 / CACHE HITReuse & generate
Reusing state can reduce repeated work. Any charges follow the billing rules below.
HeyGen
avatar_iv
Not verified
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
How it works
Not collected
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
Minimum reusable input
Not collected
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
Lifetime & refresh
Not collected
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
How to enable it
Not collected
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
Usage fields
Not collected
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
Billing rules
Not collected
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
Limits & data boundaries
Not collected
No model-specific prompt-cache contract established. Idempotency and saved avatar/voice assets are separate.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Caching reviewed 14 Oct 2026
What the measurements say
No benchmark observations have been added for this model. We do not turn a vendor description into a performance score.
Latency and throughput depend on the host, request size, reasoning settings and load. There is no measured speed or global usage figure in this record.
The record behind the model
Why it is included
Official documentation identifies this HeyGen model or proprietary engine, exposed through hosted API or Studio access. Service terms restrict distribution of proprietary technology; no model-weight distribution is established.
