Can you do basic addition of 2 arbitrary numbers with 100% accuracy (no tools) ? No you can't. You will make mistakes for a sufficiently large N even with pen and paper, and a very small N without. Are you no longer generally intelligent ?

LLMs should use tool calling (which is 100% reliable) instead of doing math internally. But in general it would be nice to be able to teach a process and have the AI execute it deterministically. In some sense, reliability between 99% and 100% is the worst because you still can't trust the output but the verification feels like wasted effort. Maybe code gen and execution will get us there.