This study showed significant improvement in symptoms (51%) with the use of an AI-enhanced CBT-trained chatbot but I personally have found interacting with ChatGPT rather than a CBT-structured "therapy" bot far more effective.
https://interestingengineering.com/health/groundbreaking-ai-therapy-shows-positive-results
ChatGPT's conversations are more natural and it shows far more empathy than the CBT chatbots I was asked to test in 2018. See my article:
