ChatGPT is going to be far better than 99% of currently practicing shrinks at using the DSM. Same thing versus regular doctors too.
I'm a therapist and have been one for decades.
I don't know how an AI can work with patients effectively due to the fact that most people will say what appears to be true but really it's something else after you get to know them.
For instance, when you first meet someone they will give you the technical details of their problem, such as, I'm depressed, I can't sleep, I'm having trouble focusing, etc. That info fits in very well with DSM diagnosis, so it's easy in the beginning.
However, most people don't have "mental illness" they have some trauma that caused them to develop ideas that produce depression, anxiety, etc. So, after the patient gets to know you they will tell you their parents took them for granted, they had few friends, they grew up around bullies, their dad left and they can't put a name to how they feel about that, and so on. Thus, the problem is NOT in the DSM but rather it's due to the effect of life events and is an existential issue.
If you are using AI you probably can only get technical diagnostic data and not find information about dad neglecting you or dealing with the effects of a single mom on your life. That's because those issues are understood by humans but do not have much research. That or the research is fake woke material.
I have dealt with a lot of prostitutes because I do a lot of treatment of criminals/drug addicts. The research data on prostitutes is fake, because it's "woke" and concludes that prostitutes are OKAY. Meanwhile, I have gotten the real story about prostitutes and that is, they hate men, they are frequently lesbians, they need drugs to numb themselves to have sex, they are sociopathic tricksters, etc. My bet is that if you tell an AI you're a prostitute it will probably conclude that you are a well adjusted "sex worker" and that you don't have any diagnosable problem when in reality you have the worst issues in psychology.
Psychology is VERY bourgeois which means there's a lot of "middle class" lies in it to hide the real sources of suffering, which tend to be family issues and marginalized people like homeless, prostitutes, and addicts which bourgeois don't want to think about. So, AI is not going to be programmed to know about these people and issues.