Up to 9 images, 3 videos, 3 audio clips, maximum 12 total. Reference mode needs at least an image or video; audio alone is insufficient. Only first 5 seconds of each reference video are used.Source for references (opens in a new tab)
assetLimits
HTTPS or uploaded assets or base64. Downloads: image 16 MB, video/audio 32 MB. Inline decoded data: image 5 MB, video/audio 16 MB. Redirects are not followed.Source for assetLimits (opens in a new tab)
resolutionBilling
1080p and 2k cost 3× the 768p rate; base dollar rate not established. These resolutions require 16:9 or 9:16 for text/reference modes. Image mode follows its first frame.Source for resolutionBilling (opens in a new tab)
Asynchronous job. Callback is delivered once; polling remains the fallback. Jobs run to completion. Signed output URLs can be refreshed through the job record.Source for delivery (opens in a new tab)
Endpoint pricing has not been collected. Check the provider for applicable rates.
Data & enterprise terms
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
heygen-video-1
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 model documentation identifies a HeyGen post-trained derivative of MiniMax H3. Hosted proprietary model access under HeyGen terms does not release the weights or establish independent base pretraining.
