And LLMs can handle very abstract concepts that could not possibly be encoded in C++, like the user's goal in using software.
Is the probability much higher with GCC? Sure. But it's still a probability.
If people are so confident about the determinism of LLMs, or at least consider it on par with compilers, please ask it to compile your source code instead. Better yet, replace all your GNU utils with LLM instead. Replace your `ls` with `codex "prompt"`.
Non-deterministic systems produce different output states given identical input states.
Even if a compiler's memory gets a one-in-a-million bitflip that produces a different output, it doesn't mean it's non-deterministic. It just means that the output state is different due to an external force changing the internal state.
An infinite loop will halt when the processor is powered off.