Utilize the most advanced cutting-edge AI models without the need to log in. 

Yes, Perplexity AI Lab is back as a part of a larger effort to bring full Web and AI capabilities to NostrNet.work
https://video.nostr.build/6b42e18ea8fe28421fa4d67c2bbd9fd1d9e7ddcdbb7b3e6ccf23aefb6e8de60c.mp4 

 Is pplx a Fine-tuned llama2?  

 It looks like, it's mixture of everything
https://blog.perplexity.ai/blog/introducing-pplx-api