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Model infoModelsSnapshot: 15 Oct 2026

HeyGen / HeyGen managed speech

Dolphin (Studio engine)

Studio speech engine described as a lightweight option for fast drafts; underlying model identity is not disclosed.

Speech & voice
availableClosed-source managed componentText-to-speechSpeech synthesis
Official documentation (opens in a new tab)Reviewed 14 Oct 2026
2 of 16 specification fields collected
Context windowNot collectedAwaiting source review
Maximum outputNot collectedAwaiting source review
Input billingNot collectedHeyGen
Output billingNot collectedNo inferred price

Specifications

Provider-documented facts. “Not collected” means we have not verified that field yet, not that the feature is unsupported.

Context / input limit
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Maximum output
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Context caching
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Reasoning
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Tool calling
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Structured output
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Streaming
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Batch processing
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Fine-tuning
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Parameters
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Architecture
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Knowledge cutoff
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Languages
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Release date
Not collected

No exact model-specific contract established; missing information does not mean unsupported.

Input modalities
TextSource for Input modalities (opens in a new tab)
Output modalities
AudioSource for Output modalities (opens in a new tab)

Access & pricing

Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.

HeyGen

Provider source (opens in a new tab)
API model ID
Not collected

No exact current API model identifier established.

Access
HeyGen Studio voice-engine selection; availability depends on the selected voice and account. No public model-specific API route verified.
Regions
No model-specific processing or storage region guarantee established.

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.

Read the service policy (opens in a new tab)

Caching

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

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

Named speech engine in HeyGen Studio. Public documentation does not establish privately owned base weights or a versioned model identifier; explicitly treated as a managed service component.

Classification evidence (opens in a new tab)

Sources reviewed