Cognitive Services pricing—Language Understanding (LUIS)

Use intelligence APIs to enable vision, language, and search capabilities

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

Pricing details

Instance Transactions Per Second (TPS)1 Features Price
Free2 Authoring -
5 TPS Text Requests
Free2 Prediction -
5 TPS Text Requests
Standard -
50 TPS Text Requests $- per 1,000 prediction transactions*
Speech Requests $- per 1,000 prediction transactions*
1 TPS only applies to web endpoint
2 Free Tier includes only text as an input.
* Dispatch will do two text transactions per request. Each text phrase sent in an evaluation request will be charged as a transaction.

Support & 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 percent of the time. No SLA is provided for the free trial. Read the SLA.

Frequently asked questions

  • 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 500 characters.

  • Dispatch is a feature that enables processing two models/applications with one API call.
  • Build, manage and publish your app using an authoring key while query endpoints with the prediction key. Learn more
  • Learn more about authoring and publishing regions
  • It is a batch prediction request that provides evaluation results on the published model. Learn more


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