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Azure AI Speech pricing

Unified speech services for speech-to-text, text-to-speech and speech translation

The unified Speech services provide a wide range of speech recognition and generation capabilities including speech transcription, text-to-speech and speech translation. The Speech service provides a wide range of speech recognition and generation capabilities including speech transcription, text-to-speech, speech translation and speaker recognition.

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Apply filters to customize pricing options to your needs.

Prices are estimates only and are not intended as actual price quotes. Actual pricing may vary depending on the type of agreement entered with Microsoft, date of purchase, and the currency exchange rate. Prices are calculated based on US dollars and converted using London closing spot rates that are captured in the two business days prior to the last business day of the previous month end. If the two business days prior to the end of the month autumn on a bank holiday in major markets, the rate setting day is generally the day immediately preceding the two business days. This rate applies to all transactions during the forthcoming month. Sign in to the Azure pricing calculator to see pricing based on your current programme/offer with Microsoft. Contact an Azure sales specialist for more information on pricing or to request a price quote. See frequently asked questions about Azure pricing.

Free (F0)

Category Features Price
Speech to Text
(per second billing)
Standard 5 audio hours free per month3
Custom 5 audio hours free per month3
Endpoint hosting: 1 model free per month1
Conversation Transcription Multichannel Audio PREVIEW 5 audio hours free per month
Text to Speech
(per character billing)
Neural 0.5 million characters free per month
Speech Translation
(per second billing)
Standard 5 audio hours free per month
Speaker Recognition
(per transaction billing)
Speaker Verification2 10,000 transactions free per month
Speaker Identification2 10,000 transactions free per month
Voice Profile Storage 10,000 transactions free per month

See the documentation for information on quotas, limits and instructions on how to increase concurrent requests.

1Unused models will be automatically decommissioned after 7 days.

2Speaker Recognition is a limited access feature with a need to apply for access.

3Free audio hours for speech to text is shared between Standard and Customised, Batch is not supported.

Pay as You Go: pay only for what you use.

Category Price
Speech to Text
(per second billing)
Standard Real-time Transcription: $- per hour
Fast TranscriptionPreview: $- per hour9
Batch Transcription: $- per hour1
Custom Real-time Transcription: $- per hour
Batch Transcription: $- per hour1
Endpoint hosting: $- per model per hour
Customised Speech Training5: $- per compute hour
Enhanced add-on features:
  • Continuous Language identification
  • Diarization
  • Pronunciation Assessment (prosody, grammar, vocabulary, topic)
Real-time: $- per hour per feature
Batch (Continuous Language identification, Diarization): Included in Standard/Customised (no extra charge)
Conversation Transcription Multichannel Audio PREVIEW $- per hour2
Speech Translation
(per second billing)
Real-time Speech Translation $- per audio hour3
Video TranslationPreview Batch: $- per output video minute
Content editing: $- per output video minute
Personal Voice: $- per output video minute
Text to Speech8 Standard Voice Neural: $- per 1M characters
Neural HD4: $- per 1M characters
Customised Voice Professional Voice:
Synthesis: $- per 1M characters
Voice model training: $- per compute hour, up to $- per training
Endpoint hosting: $- per model per hour
Personal Voice6:
Synthesis: $- per 1M characters
Voice creation: Free
Voice profile storage: $- per 1,000 voice profiles per month
Enhanced Add-on feature: AvatarPreview Standard: $- per minute
Custom:
Real-time synthesis: $- per minute
Batch synthesis: $- per minute
Endpoint hosting: $- per model per hour
Speaker Recognition
(per transaction billing)
Speaker Verification7 $- per 1,000 transactions
Speaker Identification7 $- per 1,000 transactions
Voice Profile Storage $- per 1,000 voice profiles (10,000 free voice profiles per month)

See the documentation for information on quotas, limits and instructions on how to increase concurrent requests.

Speech to text hours are measured as the hours of audio sent to the service, billed in second increments.

1To take advantage of this new Batch Transcription pricing you need to use Speech to text REST API V3.2 or later versions. See Speech to text REST API for information.

2This reflects public preview pricing.

3This price includes 1 audio input and output, up to 2 text translation language using standard or customised Speech to Text and standard Translation. For customised Translation or 3+ translation languages, please reference the Azure AI Translator Text Translation pricing page.

4OpenAI text to speech voices are available via two model variants: Neural and NeuralHD. Learn more here.

5Customised Speech Training applies when customising any base model released on or after October 1, 2023.

6Personal Voice is a limited access feature restricted to certain pre-approved use cases only, with a need to applying for access. To learn more about the service, check the document.

7Speaker Recognition is a limited access feature with a need to apply for access.

8Text to Speech: speech synthesis usage is billed per character. Avatar is billed per second. Training and model hosting is billed per second.

9To use Fast Transcription you need to use Speech to text REST API 2024-05-15-preview or later versions. See Speech to text REST API for information.

Commitment Tiers – Azure - Standard

Category Features Price (per month) Overage
Speech to Text Standard $- for 2,000 hours $- per hour
$- for 10,000 hours $- per hour
$- for 50,000 hours $- per hour
Custom $- for 2,000 hours $- per hour
$- for 10,000 hours $- per hour
$- for 50,000 hours $- per hour
Enhanced add-on features:2
  • Continuous Language identification
  • Diarization
  • Pronunciation Assessment (prosody, grammar, vocabulary, topic)
$- for 2,000 hours $- per hour
$- for 10,000 hours $- per hour
$- for 50,000 hours $- per hour
Text to Speech Neural1 $- for 80M characters $- per 1M characters
$- for 400M characters $- per 1M characters
$- for 2,000M characters $- per 1M characters

1Real-time synthesis only, this does not include long audio creation.

2Real-time speech to text only, Continuous Language Identification and Diarization add-on features included with batch speech to text.

Commitment Tiers – Connected container

Category Features Price (per month) Overage
Speech to Text2 Standard $- for 2,000 hours $- per hour
$- for 10,000 hours $- per hour
$- for 50,000 hours $- per hour
Custom $- for 2,000 hours $- per hour
$- for 10,000 hours $- per hour
$- for 50,000 hours $- per hour
Enhanced add-on features:2
  • Language identification
  • Diarization
$- for 2,000 hours $- per hour
$- for 10,000 hours $- per hour
$- for 50,000 hours $- per hour
Text to Speech Neural1 $- for 80M characters $- per 1M characters
$- for 400M characters $- per 1M characters
$- for 2,000M characters $- per 1M characters

1Real-time synthesis only, this does not include long audio creation.

2Pricing applies to real-time and batch use cases. There is no separate batch pricing for containers.

See the documentation for information on Commitment tiers.

Commitment Tiers – Disconnected container

Sign up to access speech in disconnected containers, or learn more

Category Features Price (per year) Max usage (per year) Projected usage (per month)
Speech to Text2 Standard $-
$-
Sign up to get access
Learn more
120,000 hours
600,000 hours
10,000 hours
50,000 hours
Custom $-
$-
Sign up to get access
Learn more
120,000 hours
600,000 hours
10,000 hours
50,000 hours
Enhanced add-on features:
  • Language identification
  • Diarization
$-
$-
120,000 hours
600,000 hours
10,000 hours
50,000 hours
Text to Speech Neural1 $-
$-
Sign up to get access
Learn more
4.8B characters
24B characters
400M characters
2,000M characters

1Real-time synthesis only, this does not include long audio creation.

2Pricing applies to real-time and batch use cases. There is no separate batch pricing for containers.

These features are being deprecated and only available for existing customers to use. Check details and learn how to migrate to new features.

Instance Category Features Price
Free - Web/Container
1 concurrent request
Text to Speech Standard 5 million characters free per month
Custom 5 million characters free per month
Endpoint hosting: 1 model free per month
Standard - Web/Container
100 concurrent requests for Base model
20 concurrent requests for Custom model
Text to Speech Standard $- per 1M characters
Custom $- per 1M characters
Endpoint hosting: $- per model per hour

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Additional resources

Azure AI Speech

Learn more about Azure AI Speech features and capabilities.

Pricing calculator

Estimate your expected monthly costs for using any combination of Azure products.

Documentation

Review technical tutorials, videos and more Azure AI Speech resources.

    • For Speech to Text and Speech Translation, usage is billed in one-second increments.
    • For Text to Speech: usage is billed per character. Check the definition of character in the pricing note.
    • For customised neural voice hosting: usage is billed per endpoint per second. Check details in the pricing note.
    • For personal voice profile storage: usage is billed per voice profile per day. Check details in the pricing note.
    • There is no charge for training Speech models. The only costs are hosting the model once trained and then the cost per hour of speech transcription.
    • For Speech to Text and Text to Speech (including Avatar), endpoint hosting for customised models is billed per second per model.
  • The Speech service enables users to adapt baseline models based on their own acoustic and language data, leading to custom speech models that can be used against both Speech to Text and Speech Translation.

  • The language model is a probability distribution over sequences of words. The language model helps the system decide among sequences of words that sound similar, based on the likelihood of the word sequences themselves. For example, “recognise speech” and “wreck a nice beach” sound alike but the first hypothesis is far more likely to occur and therefore will be assigned a higher score by the language model. If you expect voice queries to your application to contain particular vocabulary items, such as product names or jargon that rarely occur in typical speech, it is likely that you can obtain improved performance by customising the language model. For example, if you were building an app to search MSDN by voice, it is likely that terms like “object-oriented” or “namespace” or “dot net” will appear more frequently than in typical voice applications. Customising the language model will enable the system to learn this.

  • The acoustic model is a classifier that labels short fragments of audio into one of several phonemes, or sound units, in each language. These phonemes can then be stitched together to form words. For example, the word “speech” is comprised of four phonemes “s p iy ch”. These classifications are made on the order of 100 times per second. Customising the acoustic model can enable the system to learn to do a better job in recognising speech in atypical environments. For example, if you have an app designed to be used by workers in a warehouse or factory, a customised acoustic model can more accurately recognise speech in the presence of the noises found in these environments.

  • Speech service offers a wide range of text-to-speech (TTS) voice fonts, however custom neural voice allows you to build your own custom voice that suits your needs and your brand. Read the blog for more information.

  • Language identification allows you to identify a switch in spoken language and transcribe speech accordingly. This can be applied in scenarios where the audio language is unknown, or when speaker(s) may speak multiple languages. Single Language Identification is available at no additional cost. Continuous Language Identification is an enhanced add-on feature. Visit docs to learn more.

    • Pronunciation assessment evaluates speech pronunciation and gives speakers feedback on the accuracy and fluency of spoken audio. With pronunciation assessment, language learners can practise, get instant feedback, and improve their pronunciation so that they can speak and present with confidence. Educators can use the capability to evaluate pronunciation of multiple speakers in real time. Visit docs to learn more.
    • It is charged as standard Speech to Text, example:
      For evaluation of 8 seconds of speech, you will be charged around $-

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