A test on an RTX 5060 Ti showed that reducing a local AI voice assistant's model size from 9B to 0.8B leads to a sharp decline in capability. The 9B model handles tool orchestration well, while smaller models show increasing failures: the 4B model skips tool calls and guesses facts, the 2B model suffers semantic drift, and the 0.8B model fails to operate agent functions, triggering wrong APIs or infinite loops.