There are already several fully integrated AI applications available for Dynamics 365 which often only need to be licensed and/or activated or even are there as part of the standard first party apps.
Dynamics 365 Customer Insights
Predict customer intent and interests by analyzing customer interactions, behavior, sentiment and demographic data. Deep insights and 360 degree view of customers.
License: 1500 USD per tenant/month (incl. 100.000 profiles)
Dynamics 365 Sales Insights as part of Dynamics 365 Sales
here you have some AI functionality included already with the standard D365 Sales license but the available features can be extended through an on top license. Bullet points are Guided Selling, Productivity Intelligence, Connection Insights, Prediction Models. Includes recommendations for Next Best Action and also Sentiment Analysis.
License: 40 USD per user/month (includes 3 hours per user/month Conversation Intelligence) on top of Sales Enterprise license.
Dynamics 365 Virtual Agent for Customer Service
allows you to create chat bots which use
License: 1100 USD per tenant/month (includes 2000 sessions / 100.000 Cases)
Dynamics Customer Service Insights as part of Dynamics 365 Customer Service
provides insights in the performance of your customer service employees by natural language understanding including call analysis. It also helps finding trends, brand sentiment, historical comparison of cases and identifying most relevant support topics.
License: 75 USD per user/month (100.000 cases)
Dynamics 365 Fraud Protection as part of Dynamics 365 Commerce
helps e-commerce businesses to fight agains fraud by finding irregularities and identifying risks:
License: 1000 USD per tenant/month (with limits on number of available transactions for Account Protection, Purchase Protection and Loss Prevention)
there are plenty of other AI tools which can leverage Dynamics 365 implementations in many other ways.
Especially mentioned should be the Microsoft AI Builder, which is an important tool package that provides ready made AI tools for low code / rapid implementation with D365 / CDS / Power Apps. License: 500 USD per tenant/month (1 million service credits).