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The C++ compiler on SCO OpenServer Release 5 is based on AT&T's original C++ compiler Cfront. The language dialect accepted is that of the Annotated C++ Reference Manual, circa 1992, less exceptions. It incorporates none of the new features or interpretations from the upcoming ANSI/ISO standard.
The C++ compiler on SCO UnixWare 2.1.X is based on newer compiler technology (the front end from Edison Design Group), and is in general a better compiler than the SCO OpenServer one (more accurate, more reliable, better template instantiation mechanism, support for precompiled header files, better support for Pentium and Pentium Pro target architectures, etc.). However the language dialect is still largely that of the Annotated C++ Reference Manual, less exceptions, plus a few relatively minor features and interpretations from the upcoming ANSI/ISO standard.