Watson Developer Cloud

Natural Language Classifier

Interpret and classify natural language with confidence.

General Availability

The Natural Language Classifier service understands the intent behind text and returns a corresponding classification, complete with a confidence score. For example “What is the weather like today? or “Is it hot out?” or “Is it going to be nice today?” are all ways of asking about “temperature”. Use NLC to answer questions in a contact center, create chatbots, categorize volumes of written content and more.

Intended use

The Natural Language Classifier works best with short text (1000 characters or less) and can be trained to function in any domain or application. Use Natural Language Classifier to perform tasks such as:

  • Classify SMS texts as personal, work, or promotional
  • Classify tweets into a set of classes, such as events, news, or opinions
  • Tackle common questions from your users that are typically handled by a live agent
  • Trigger actions in an application, such as start another application, respond with an answer, or begin a dialog

You input

  • Text to a pre-trained model

Service output

  • Classes ordered by confidence

Try it out

Check out Natural Language Classifier when it's trained to a weather domain

How it is used


First Classifier


First classifier is FREE. Each additional classifier is $20.00 per month.

Additional classifiers are charged for on a monthly basis.

API Calls


First one thousand API calls per month are FREE. Additional calls are $0.0035 per call.

You are charged only for the GET /classify and POST /classify methods.

Classifier Training Events


First four training events per month are FREE. Additional training events are $3.00 per training event.

Training events are tracked and charged for on a monthly basis.

Ready to use?


Getting started is easy! Try out the service on Bluemix now.

Use In Bluemix


Ready to get down to the details? Full documentation detailing how to get started using this Service in Bluemix is available for each Watson service.

View full docs


Localized versions of Watson services (Natural Language Classifier, Retrieve and Rank, Speech to Text, Text to Speech) are available in the following places.

Japanese - SoftBank