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Model infoModelsSnapshot: 15 Oct 2026

HeyGen / HeyGen Voice

HeyGen Voice 1 Turbo

Lower-latency HeyGen Voice model for instant clones; professional clones are not supported.

Speech & voice
previewClosed weightsText-to-speechSpeech synthesis
Official documentation (opens in a new tab)Reviewed 14 Oct 2026
8 of 20 specification fields collected
Text input limit5K5,000
Languages39 listedFull language list in specifications
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
SupportedSource for Streaming (opens in a new tab)

SSE carries ordered generated audio parts, not just job status.

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
View all 39 entries
  • ar
  • be
  • bg
  • ca
  • cs
  • da
  • de
  • el
  • en
  • es
  • fa
  • fi
  • fr
  • he
  • hi
  • hr
  • hu
  • id
  • it
  • ja
  • ko
  • mk
  • ms
  • nl
  • pl
  • pt
  • ro
  • ru
  • sk
  • sl
  • sr
  • sv
  • ta
  • th
  • tl
  • tr
  • uk
  • vi
  • zh
Source for Languages (opens in a new tab)

Base language codes. Regional tags normalize to the base and do not select an accent.

Release date
Not collected

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

Input modalities
Text, AudioSource for Input modalities (opens in a new tab)

Text drives synthesis; audio is used to create the voice.

Output modalities
AudioSource for Output modalities (opens in a new tab)
Maximum prompt characters
5,000Source for Maximum prompt characters (opens in a new tab)

1–5,000 characters, not tokens.

Sample rate
44,100Source for Sample rate (opens in a new tab)

Completed speech WAV sample rate.

Output formats
WAV completed audio, SSE streamed audio partsSource for Output formats (opens in a new tab)
Generation controls
Instant: expressiveness_boost 0–1, default 1. Valid seed/speed/pitch controls are accepted but ignored; no break pauses.Source for Generation controls (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
heygen-voice-1-turbo
Access
POST https://api.heygen.com/v3/models/audio/tts or /tts/stream; active compatible workspace or public voice required.
Regions
No model-specific processing or storage region guarantee established.
rateLimit
30 requests per minute per workspace member for each TTS endpoint.Source for rateLimit (opens in a new tab)
instantCloning
One recording, first 3 minutes used; normally ready in seconds. Free creation during preview counts toward voice allowance. Earlier instant voices must be recloned for Voice 1.Source for instantCloning (opens in a new tab)
timestamps
Optional character alignment, no additional charge. Completed responses provide original characters; streamed alignment includes original and normalized characters.Source for timestamps (opens in a new tab)
identityDefaults
Studio recommends similarity=max at clone creation and expressiveness_boost=0.5 at speech generation. API defaults differ: extra_high and 1.0.Source for identityDefaults (opens in a new tab)
voiceCompatibility
Instant voices only; professional voices return 400. No numerical latency guarantee provided.Source for voiceCompatibility (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.

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

heygen-voice-1-turbo
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.

Classification evidence (opens in a new tab)

Sources reviewed