Mark Zuckerberg talks about why the Llama run broke after Llama 3.
says Llama 3 was a very good model and almost at the frontier, then Llama 4 fell off the path they needed.

His read is that he staffed it like Instagram feed and ads, with hundreds or thousands of people in parallel, when a frontier model needs a small tight science team.

"When you're an entrepreneur, you're building something, I think you kind of get tested in those moments because inevitably not everything is going to go well. And the things that kind of define the trajectory are, okay, if something doesn't go the way that you want, how do you basically figure out how to move forward?"

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From "The Next Big Thing" YouTube channel, (link in comment)