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Cognitive Services pricing – Language Understanding (LUIS)

Use intelligence APIs to enable vision, speech, language and knowledge capabilities

Language Understanding (LUIS) offers a fast and effective way to add language understanding to applications. With LUIS, you can use pre-existing, world-class, pre-built models whenever they suit your purposes. When you need specialised models, LUIS guides you through the process of quickly building them.

Pricing details

Instance Transactions per second (TPS)1 Features Price
Free2 -
5 TPS Text requests
Standard -
50 TPS Text requests $- per 1,000 transactions*
Speech requests $- per 1,000 transactions*
1 TPS only applies to web endpoint
2 Free Tier only includes text as an input.
* Dispatch will do two text transactions per request.

Support and SLA

  • Free billing and subscription management support are included.
  • We guarantee that Cognitive Services running in the standard tier will be available at least 99.9 per cent of the time. No SLA is provided for the free trial. Read the SLA



  • For text requests, a transaction is an API call with query length up to 500 characters.

    For speech requests, a transaction is an utterance with query length up to 15 seconds long.

  • No, the free tier only includes text requests with max. length of 500 characters.

  • Dispatch is a feature that enables processing two models/applications with one API call.


  • Bing Search APIs are invoiced based on number of transactions (also known as API calls). These plans are pay-as-you-go and don’t incur additional costs for complex queries and more than 10 results (up to 50 results in most cases).

  • If you happen to exceed the mentioned number of transactions per second (TPS), your usage will be throttled to be within the mentioned limit. If your application needs to have higher TPS than the ones mentioned on this page, please get in touch with the Azure support team.

  • For billing purposes, a transaction is a successful Bing API call request (though there are caveats for DoS attacks). For logging and reporting purposes such as for the Bing Statistics Add-in, it is any Bing API call irrespective of whether it is successful or not.

  • You can change the tier of service at any time. Please make sure that you use appropriate keys in your API calls. If you are having enterprise agreement with Microsoft, please work with your account executive.


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