Classify text passages

Understand the intent behind text and returns a corresponding classification, complete with a confidence score.

Evaluate results

Update training data based on classification results and create and train a classifier using updated training data.

Build conversational applications

Answer questions in a contact center, create chatbots, categorize volumes of written content and more.

Natural Language Classifier service overview

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Start Building with Natural Language Classifier

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Developer tools

Everything you need to start building with Watson.

Learn more about Natural Language Classifier


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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.