The New York Times has sent generative AI startup Perplexity a "cease and desist" notice demanding the company stop using its content, The Wall Street Journal reported on Tuesday.

The letter from the news publisher said the way Perplexity was using its content, including to create summaries and other types of output, violates its rights under copyright law, the report said.

Perplexity and The New York Times did not immediately respond to Reuters' requests for comment.

NYT is also tussling with ChatGPT maker OpenAI, which it had sued late last year, accusing the firm of using millions of its newspaper articles without permission to train its AI chatbot.