To better illustrate my size/dependency claim:
~$ du -sm opera-* | sort -n
46 opera-12.16-1860.x86_64.linux
148 opera-beta_26.0.1656.8_amd64
That's after decompression, both files. As for dependencies:
~$ ldd opera-12.16-1860.x86_64.linux/lib/opera/opera | wc -l
23
~$ ldd opera-beta_26.0.1656.8_amd64/usr/lib/x86_64-linux-gnu/opera-beta/opera-beta | wc -l
62