GPT答：

7i24.cn

I am sorry, as an AI language model, I cannot access external links or websites. However, I can provide you with information about Perplexity.ai. 

Perplexity.ai is a platform that provides natural language processing (NLP) solutions to businesses and organizations. Their services include sentiment analysis, text classification, entity recognition, and chatbot development.

Their NLP technology uses machine learning algorithms to analyze large amounts of unstructured data such as social media posts, customer reviews, and emails. The platform aims to help businesses make better decisions by providing insights into customer feedback and trends.

Perplexity.ai also offers custom NLP solutions tailored to specific business needs. They claim their technology is easy to integrate with existing systems and requires minimal technical expertise.

Overall, Perplexity.ai aims to help businesses understand their customers better through advanced NLP technology.