[lispm]

'object model' in Lisp has two traditional meanings. Originally data with identity is called an object. A cons cell, a vector, a string, some numbers, characters, symbols, ... all these are objects. One can reference any of them via variables, can return them from functions, give them as arguments to functions. Arguments are not copied. Function results are not copied. Etc. The JVM for example has a similar 'object model' like Lisp - thus the GLS quote: Java developers were half-way dragged to Lisp.

The second meaning is the object model in the sense of 'object oriented programming'. One of the similarities might be the use of meta-classes. Generally though CLOS isn't that near to the class-based OOP object-model of Python. CLOS uses a mixed model of classes and independent generic functions (with multiple dispatch)...