LuaJIT implements the full set of language features defined by Lua 5.1. The virtual machine (VM) is API- and ABI-compatible to the standard Lua interpreter and can be deployed as a drop-in replacement.
LuaJIT offers more performance, at the expense of portability. It currently runs on all popular operating systems based on x86 or x64 CPUs (Linux, Windows, OSX etc.). Other platforms will be supported in the future, based on user demand and sponsoring.