In a remarkable feat of technological archaeology, scientists have successfully resurrected ELIZA, the world’s first chatbot, from 60-year-old computer code. Originally developed by Joseph Weizenbaum at MIT in the 1960s, ELIZA has been brought back to life, showcasing its historical significance and relevance in today’s AI landscape.
Key Takeaways
ELIZA was the first chatbot, created in the 1960s by Joseph Weizenbaum.
The original code was thought to be lost until its rediscovery in 2021.
The restoration process involved cleaning and debugging 420 lines of code.
ELIZA’s conversational abilities highlight the evolution of AI technology.
The revival underscores the importance of preserving computing history.
The Journey of ELIZA
ELIZA was designed to simulate conversation, primarily using a script known as the "DOCTOR" script, which allowed it to mimic a psychotherapist. Users could engage with ELIZA by typing in their thoughts, and the chatbot would respond with questions that encouraged further dialogue. For instance, if a user stated, "Men are all alike," ELIZA would reply, "In what way?"
The original code, written in a now-defunct programming language called MAD-SLIP, was later translated into Lisp, which contributed to its viral popularity during the early days of the internet. However, the original version was believed to be lost until researchers stumbled upon it in MIT’s archives in 2021.
The Restoration Process
Bringing ELIZA back to life was no small task. The restoration team, comprising AI historians and computer scientists, faced several challenges:
Code Recovery: They had to sift through dusty printouts and archived records to locate the original code.
Debugging: The team cleaned and debugged the 420 lines of code, ensuring it could run on an emulated IBM 7094 computer.
Historical Accuracy: They decided to retain a quirky bug that causes ELIZA to crash when users input numbers, preserving the authenticity of the original program.
ELIZA's Impact on Modern AI
Despite its rudimentary design compared to today’s advanced AI systems, ELIZA remains a significant milestone in the evolution of artificial intelligence. It was one of the first programs to engage users in a meaningful way, laying the groundwork for future chatbots and AI technologies.

The revival of ELIZA raises important questions about the nature of understanding in AI. While modern chatbots like ChatGPT are capable of generating human-like responses, they often lack the depth of engagement that ELIZA provided. The simplicity of ELIZA’s interactions serves as a reminder of the importance of genuine conversation in AI design.
Preserving Computing History
The resurrection of ELIZA not only highlights the ingenuity of early AI but also emphasises the need to preserve computing history. As technology continues to advance at a rapid pace, it is crucial to remember and honour the foundational work that has shaped the field of artificial intelligence.
In conclusion, the revival of ELIZA is a celebration of both technological progress and historical significance. It serves as a bridge between the past and the future of AI, reminding us of the importance of meaningful interactions in the development of intelligent systems.
Sources
ELIZA: World's first AI chatbot has finally been resurrected after decades | New Scientist, New Scientist.
World's first chatbot 'ELIZA' ressurected from 60-year-old computer code, Geo.tv.
'ELIZA,' the world's 1st chatbot, was just resurrected from 60-year-old computer code | Live Science, Live Science.