Doesn't Perplexity run on GPT?
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Microsoft’s new Phi-3 LLM is insanely fast at general knowledge. My latest stack of LLMs include Llama 3, Perplexity, Sonar Small and Medium, and Phi-3. There’s also an insane image generator from HuggingChat I’ve been using that is leaps and bounds better than Midjourney.
It’s their own model, based on a combination of multiple LLMs and their own in-house search, indexing and crawling.