What is the function of the 'temperature' parameter in large language models?

The correct option is It regulates the randomness.

The temperature parameter in large language models like ChatGPT controls the randomness of the output. A higher temperature value (e.g., closer to 1.0) makes the output more random, creative, and diverse, as the model is more likely to select less probable words. A lower temperature value (e.g., closer to 0.0) makes the output more deterministic, focused, and less creative, as the model is more likely to select the most probable words.

The final answer is $\text{It regulates the randomness}$