Doesn't that just depend on what LLM you happen to be using? And doesn't Perplexity support many different LLMs?
"Select your preferred AI Model. Choose from GPT-4o, Claude-3, Sonar Large (LLama 3.1), and more"
Edit: looks like perplexity deprecated/dropped mistral and recommends using llama instead, effective 8/12/24:
https://docs.perplexity.ai/changelog/changelog#model-depreca...