These are the most stable versions you are looking for.
You can use this link for your reference
Hope this helps!
You’d want to be be using a Long Term Support (LTS) or Medium Term Support (MTS) version of Mendix.
MTS versions are currently the latest versions of 9.6 or 9.12.
LTS versions are the latest versions of 8.18 or 7.23
Hope this helps.
9.10.4 , 9.12.4 and 9.6.12 these are the stable versions.
hii , Prasanna Karvande
the Long Term Supported versions of mendix are
you can decide for right version for you of mendix with the help of this official decumentation of mendix link below:
Mendix is pretty stable in any version.
Biggest threats to stability are sloppy programming and too small sizings.