It looks like there's some variability:

  smartos$ uname -a
  SunOS smartos 5.11 joyent_20240701T205528Z i86pc i386 i86pc Solaris

Core system stuff:

  smartos$ file /usr/bin/ls
  /usr/bin/ls: ELF 32-bit LSB executable, Intel 80386, version 1 (Solaris), dynamically linked, interpreter /usr/lib/ld.so.1, not stripped

  smartos$ file /bin/sh
  /bin/sh: symbolic link to ksh93

  smartos$ file /bin/ksh93
  /bin/ksh93: ELF 64-bit LSB executable, x86-64, version 1 (Solaris), dynamically linked, interpreter /usr/lib/amd64/ld.so.1, not stripped

And then the pkgsrc stuff:

  smartos$ which ls
  /opt/local/bin/ls

  smartos$ file /opt/local/bin/ls
  /opt/local/bin/ls: symbolic link to /opt/local/bin/gls

  smartos$ file /opt/local/bin/gls
  /opt/local/bin/gls: ELF 64-bit LSB executable, x86-64, version 1 (Solaris), dynamically linked, interpreter /usr/lib/amd64/ld.so.1, not stripped

    $ uname -a
    SunOS bob 5.11 11.4.68.164.2 sun4v sparc sun4v kernel-zone
    $ pwd
    /usr/bin
    $ file * | grep 32-bit | wc
    46 1008 8890
    $ file * | grep 64-bit | wc
    1036 21449 185122

I think Solaris is famous for doing away with static linking.

E: A Solaris 10 amd64 box is all 32-bit in /usr/bin.

That was my first thought, too:) But is that x32 (amd64 with 32-bit pointers), or full i386 32-bit code+data?