Skip to content
Model infoModelsSnapshot: 15 Oct 2026

AssemblyAI / Universal

Universal-3.6 Pro Streaming

Live speech recognition with partial transcripts and turn detection for conversational applications.

availableClosed weightsSpeech-to-textTranscriptionTurn detection
Official documentation (opens in a new tab)Reviewed 12 Oct 2026
8 of 19 specification fields collected
Audio durationSession auto-closes after 3 hoursSee specification notes below
Audio formatsNot collectedAwaiting source review
Input billingSee ratesAssemblyAI API · Streaming
Output billingSee ratesPublished units and conditions below

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
Maximum output
Not collected
Reasoning
Not collected
Tool calling
Not collected
Structured output
Not collected
Batch processing
Not collected
Fine-tuning
Not collected
Knowledge cutoff
Not collected
Parameters
Not collected
Architecture
Not collected
Languages
View all 32 entries
  • Afrikaans
  • Korean
  • Arabic
  • Mandarin
  • Cantonese
  • Marathi
  • Catalan
  • Norwegian
  • Danish
  • Norwegian Nynorsk
  • Dutch
  • Persian
  • English
  • Portuguese
  • Estonian
  • Romanian
  • Finnish
  • Russian
  • French
  • Spanish
  • Galician
  • Swedish
  • German
  • Turkish
  • Hebrew
  • Urdu
  • Hindi
  • Vietnamese
  • Italian
  • Xhosa
  • Japanese
  • Zulu
Source for Languages (opens in a new tab)
Context caching
Not collected
Audio duration limits
Session auto-closes after 3 hoursSource for Audio duration limits (opens in a new tab)
Published request quota
New sessions/minute: free 5, paid 100+; paid limits auto-scale.Source for Published request quota (opens in a new tab)
Supported API routes
wss://streaming.assemblyai.com/v3/ws, wss://streaming.us.assemblyai.com/v3/ws, wss://streaming.eu.assemblyai.com/v3/wsSource for Supported API routes (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.

AssemblyAI API · Streaming

Provider source (opens in a new tab)
API model ID
universal-3-6-pro
Access
WebSocket /v3/ws; select via speech_model. Close the session explicitly to stop billing.
Regions
Default edge routing across US/EU; dedicated US and EU data-zone endpoints available.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 12 Oct 2026
CategoryUsageRateUnit
Pay as you goStreaming transcription1$0.45session hour

Rate conditions

  1. Billed for WebSocket-open duration, including silence and idle time. Each simultaneous connection accrues time independently. Add-ons are extra.
Pricing source (opens in a new tab)

Data & enterprise terms

Training use depends on contract and opt-out. EU processing, BAA coverage and opt-out affect training eligibility. Streaming and Sync zero audio/transcript retention require training opt-out; metadata is retained. Async artifacts have separate deletion schedules.

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.

AssemblyAI API · Streaming

universal-3-6-pro
Not verified
How it works
Not collected
Minimum reusable input
Not collected
Lifetime & refresh
Not collected
How to enable it
Not collected
Usage fields
Not collected
Billing rules
Not collected
Limits & data boundaries
Not collected

No verified cache rate for this endpoint. An empty rate is not a zero charge.

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

AssemblyAI explicitly describes its Universal speech models as proprietary. These are native provider models, separate from hosted Whisper and third-party LLM Gateway models.

Classification evidence (opens in a new tab)

Lifecycle dates

Released29 Sept 2026Source (opens in a new tab)

Sources reviewed