As both the JT and MODEL files are CAD formats, it is likely they can be converted between each other using some good CAD software with a lot of file format support, like CATIA or SolidEdge.
Convert JT Open CAD 3D model format to CATIA V4 model file.
We found 5 software records in the database related to .jt to .model file format conversion.
Microsoft Windows software - convert jt to model on Windows
A PLM/CAD/CAM/CAE software suite
Convert from jt file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jt to model. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A CAD converter with huge format support
A feature rich 3D CAD software by Siemens
A dedicated CAD converter
A CAD visualizaton, analyzation and translating system