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Model infoModelsSnapshot: 15 Oct 2026

Microsoft AI / MAI-Transcribe-2

MAI-Transcribe-2-Streaming

MAI-Transcribe-2-Streaming transcribes live audio with incremental results through the Realtime API or Azure Speech SDK.

previewClosed weightsSpeech recognitionTranscription
Official documentation (opens in a new tab)Reviewed 14 Oct 2026
14 of 26 specification fields collected
Audio sample rates16 kHz, 24 kHzSee specification notes below
Reported latencyApproximately 120 ms to first partial; approximately 128 ms end-to-end.See specification notes below
Input billingSee ratesMicrosoft Foundry Realtime
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 input tokens
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
Release date
Not collected
Parameters
Not collected
Languages
View all 60 entries
  • Afrikaans (af)
  • Arabic (ar)
  • Assamese (as)
  • Azerbaijani (az)
  • Bulgarian (bg)
  • Bengali (bn)
  • Bosnian (bs)
  • Catalan (ca)
  • Czech (cs)
  • Danish (da)
  • German (de)
  • Greek (el)
  • English (en)
  • Spanish (es)
  • Estonian (et)
  • Persian (fa)
  • Finnish (fi)
  • Filipino (fil)
  • French (fr)
  • Galician (gl)
  • Gujarati (gu)
  • Hebrew (he)
  • Hindi (hi)
  • Hungarian (hu)
  • Armenian (hy)
  • Indonesian (id)
  • Icelandic (is)
  • Italian (it)
  • Japanese (ja)
  • Kazakh (kk)
  • Kannada (kn)
  • Korean (ko)
  • Lithuanian (lt)
  • Latvian (lv)
  • Macedonian (mk)
  • Malayalam (ml)
  • Marathi (mr)
  • Malay (ms)
  • Norwegian Bokmål (nb)
  • Nepali (ne)
  • Dutch (nl)
  • Odia (or)
  • Punjabi (Gurmukhi script) (pa)
  • Polish (pl)
  • Portuguese (pt)
  • Romanian (ro)
  • Russian (ru)
  • Slovak (sk)
  • Slovenian (sl)
  • Swedish (sv)
  • Swahili (sw)
  • Tamil (ta)
  • Telugu (te)
  • Thai (th)
  • Turkish (tr)
  • Ukrainian (uk)
  • Urdu (ur)
  • Vietnamese (vi)
  • Cantonese (yue)
  • Chinese (simplified) (zh)
Source for Languages (opens in a new tab)
Context caching
Not collected
Custom vocabulary
Not supportedSource for Custom vocabulary (opens in a new tab)

The provider comparison marks keyword biasing unsupported for this variant.

Input file formats
Raw signed little-endian PCM16Source for Input file formats (opens in a new tab)

Realtime WebSocket format. SDK file examples use PCM WAV; transport contracts differ.

Audio channels
Mono for Realtime WebSocket input.Source for Audio channels (opens in a new tab)
Session duration
Up to 1 hour per Realtime API session.Source for Session duration (opens in a new tab)
Input requirements
Realtime requires manual audio commits; server-side turn detection and noise reduction must be null. Session settings cannot change after the first audio append.Source for Input requirements (opens in a new tab)
Provider-reported latency
Approximately 120 ms to first partial; approximately 128 ms end-to-end.Source for Provider-reported latency (opens in a new tab)

Provider-reported figures with workload and hardware conditions not specified; no SLA is implied.

Access & pricing

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

Microsoft Foundry Realtime

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

session.audio.input.transcription.model must be your Foundry deployment name.

Access
WebSocket /mai/v1/realtime?intent=transcription; authenticate using an API key or Microsoft Entra ID. Raw PCM audio must not contain WAV headers.
Regions
Globally accessible; serving regions: swedencentral, centralus, eastus2, southeastasia.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 14 Oct 2026
CategoryUsageRateUnit
Speech recognitionStreaming audio transcription1$0.54audio hour

Rate conditions

  1. Introductory USD rate for MAI-Transcribe-2-Streaming, per audio hour. No token conversion is applied. A future non-introductory rate was not collected. Transport-specific rounding, minimum charges and negotiated discounts were not verified.
Pricing source (opens in a new tab)

Data & enterprise terms

Model-specific retention and training-use terms not collected.

API model ID
mai-transcribe-2-streaming

Documented Speech SDK setModel selector; different from a Foundry Realtime deployment name.

Access
Azure Speech SDK with subscription key and resource region. Receive intermediate and final recognition events. PCM WAV file input is shown in SDK examples.
Regions
Globally accessible; serving regions: swedencentral, centralus, eastus2, southeastasia.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 14 Oct 2026
CategoryUsageRateUnit
Speech recognitionStreaming audio transcription1$0.54audio hour

Rate conditions

  1. Introductory USD rate for MAI-Transcribe-2-Streaming, per audio hour. No token conversion is applied. A future non-introductory rate was not collected. Transport-specific rounding, minimum charges and negotiated discounts were not verified.
Pricing source (opens in a new tab)

Data & enterprise terms

Model-specific retention and training-use terms not collected.

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.

Microsoft Foundry Realtime

Not verified

No model-specific cache policy verified for this endpoint.

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.

Caching reviewed 14 Oct 2026

Azure Speech SDK

mai-transcribe-2-streaming
Not verified

No model-specific cache policy verified for this endpoint.

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.

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

Microsoft identifies this as its own MAI model, supplied through managed inference endpoints. The reviewed model documentation provides no downloadable model weights. This record does not classify public Phi or MAI-DS-R1 weights as closed.

Classification evidence (opens in a new tab)

Sources reviewed