What is the Turing Test, and is it still relevant today?

The Turing Test, proposed by Alan Turing in 1950, evaluates a machine's ability to exhibit intelligent behavior indistinguishable from a human.

• Setup — a human evaluator chats with a hidden human and a hidden machine. If the evaluator can't reliably tell them apart, the machine 'passes.'

• Importance historically — first concrete framework for thinking about machine intelligence; shifted the question from 'can machines think?' to 'can machines behave intelligently?'

• Limitations — only tests imitation of conversation, not real understanding, reasoning, or grounded knowledge. Modern LLMs frequently pass casual Turing Tests but still hallucinate.

Modern relevance: the Turing Test is now mostly a historical milestone. Industry uses targeted benchmarks (MMLU, ARC-AGI, HumanEval, HELM) to evaluate specific capabilities.