If they asked you in the Interview why you want to change your current job, do you have to say truth or just answer with ideal model answers ?

It all depends on the situation. If there is something not to be shared with the recruiter, then it is always a good practice to show a true commitment to bringing value to the new place, or a real passion for learning and contributing towards new objectives. Never tell something that goes against the current employer. If the cause is a layoff, then minimizing the cause and augmenting the knowledge and expertise acquired is a safe route to go.

I would prefer truth

"Three things cannot be long hidden - the sun, the moon, and the truth"  -  Buddha

Ideal answers are so obvious because it is the same reasons everyone will hear and there is no wrong answer in this question so why hide the truth.

Always remember that if you say the truth, you don't need to remember what you have said. At the end, they will know the real reason when they called your previous company.

I will go for truth because you should start any relation with truth. You can be politically correct while describing the reason why you gonna leave previous job.

I will go for truth.

A (working) contract which is based on a lie is not a good start.

Depend on the situation. Sometimes the truth does mot match.  I prefer the ideal model answer which suits to all situations.

make mix between truth and expert answers

The best answer for this question is to talk about what you want to create instead of what you’re trying to avoid. Talk about opportunities you see at the company where you’re interviewing, and how you’d like to work within its mission while bringing value to the position.

Confirm what you have learned about their company from the research you have done and how you see yourself optimizing your previous experiences in order to positively impact the potential employer’s long term growth.

Why I chose the ideal model to answer this question, because most of the reasons that makes anyone change his job are negative such as poor performance, difficult working relationships, or simply that you hate your boss. Even if that was the truth, but no one get enthusiasm to complete job interview throughout touching negative vibes.

Mostly, the significance of this question is to know the reasons for lack of job satisfaction, to identify such personal aspects at work; loyalty, ambitions and personal objectives, which requires a careful answer. then I prefer ideal model answer and of course truth