OpenAI’s artificial intelligence-powered chatbot ChatGPT seems to be getting worse as time goes on and researchers can’t seem to figure out the reason why. 

In a July 18 study researchers from Stanford and UC Berkeley found ChatGPT’s newest models had become far less capable of providing accurate answers to an identical series of questions within the span of a few months.

The study’s authors couldn’t provide a clear answer as to why the AI chatbot’s capabilities had deteriorated.

To test how reliable the different models of ChatGPT were, three researchers, Lingjiao Chen, Matei Zaharia and James Zou asked ChatGPT-3.5 and ChatGPT-4 models to solve a series of math problems, answer sensitive questions, write new lines of code and conduct spatial reasoning from prompts.

According to the research, in March ChatGPT-4 was capable of identifying prime numbers with a 97.6% accuracy rate. In the same test conducted in June, GPT-4’s accuracy had plummeted to just 2.4%.

In contrast, the earlier GPT-3.5 model had improved on prime number identification within the same time frame.

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When it came to generating lines of new code, the abilities of both models deteriorated substantially between March and June.

The study also found ChatGPT’s responses to sensitive questions — with some examples showing a focus on ethnicity and gender — later became more concise in refusing to answer.

Earlier iterations of the chatbot provided extensive reasoning for why it couldn’t answer certain sensitive questions. In June however, the models simply apologized to the user and refused to answer.

“The behavior of the ‘same’ [large language model] service can change substantially in a relatively short amount of time,” the researchers wrote, noting the need for continuous monitoring of AI model quality.

The researchers recommended users and companies who rely on LLM services as a component in their workflows implement some form of monitoring analysis to ensure the chatbot remains up to speed.

On June 6, OpenAI unveiled plans to create a team that will help manage the risks that could emerge from a superintelligent AI system, something it expects to arrive within the decade.

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