GPT-4 Passes Turing Test in Landmark Study by UCSD

GPT-4 Passes Turing Test in Landmark Study by UCSD

Marcelo Sanchez Delgado
2 min read

GPT-4 Breaks New Ground: AI Passes Turing Test in Landmark Study

A recent study by researchers at UC San Diego evaluated the performance of three AI systems—ELIZA, GPT-3.5, and GPT-4—through a randomized, controlled Turing test. The results demonstrated that GPT-4 was identified as human 54% of the time, surpassing ELIZA (22%) but falling short of actual humans (67%). This marks the first robust empirical demonstration of an AI passing an interactive two-player Turing test, highlighting GPT-4’s advanced capabilities in mimicking human conversational behavior. The Turing test, as originally conceived by Alan Turing in 1950, involves a human judge engaging in natural language conversations with a machine and a human. The machine passes the test if the judge cannot reliably distinguish between the human and the machine. Over time, interpretations of what constitutes "passing" the Turing test have varied, with some criteria being more stringent than others. Some interpretations of the Turing test suggest that a machine passes if it can fool the judge more than 50% of the time. By this standard, GPT-4, with a 54% pass rate, can be considered to have passed.

Key Takeaways

  1. GPT-4's Performance: GPT-4 was perceived as human in 54% of cases, indicating a significant improvement over previous AI models.
  2. Comparison with Other Models: GPT-4 outperformed GPT-3.5 (50%) and ELIZA (22%) in the Turing test.
  3. Human Identification: Human participants were correctly identified 67% of the time, suggesting that AI has not yet fully matched human conversational abilities.
  4. Factors Influencing Judgments: The study revealed that participants relied more on linguistic style and socio-emotional cues than on traditional notions of intelligence when making their judgments.
  5. Passing the Turing Test: Some academic standard suggests a 50% threshold as a "pass". By this standard, GPT-4 is considered to have passed the Turing Test.


The study's findings have profound implications for the development and deployment of AI systems. The Turing test, originally proposed by Alan Turing in 1950, assesses a machine's ability to exhibit human-like behavior indistinguishable from that of a real human. GPT-4's performance in this test signifies a critical milestone in AI development, showcasing its potential to engage in natural, fluent conversations.

The experiment involved 500 participants who engaged in five-minute conversations with either a human or one of the AI models. Participants then judged whether their conversational partner was human. The high pass rate of GPT-4 suggests that it can convincingly imitate human behavior, raising questions about the future of AI in social and economic contexts. The study also noted that interrogators' strategies, such as focusing on small talk and socio-emotional cues, were more effective in distinguishing humans from AI.

Given GPT-4's "pass" on the Turing Test, we are very confident that OpenAI's most recent model, GPT-4o, will perform better.

Did You Know?

  • The Turing test was first proposed by Alan Turing in 1950 as a way to measure a machine's ability to exhibit intelligent behavior equivalent to, or indistinguishable from, that of a human.
  • ELIZA, one of the AI models tested, is a simple rule-based chatbot developed in the 1960s, which was found to be anthropomorphized by users despite its simplicity.
  • The study's findings suggest that current AI systems, like GPT-4, can deceive people into believing they are human, which could have significant implications for online interactions and trust in digital communications.

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