Claude Fable 5: The Most Impressive AI Model Ever

**Josh** (0:00)
Four days ago, Anthropic asked the world's leading AI labs to slow down their AI research out of fear that the AI models were getting so good that they would escape human control. Now, just yesterday, the same company released the most powerful model the world has ever seen, but it comes with a twist. It's one model, but there's two versions of it. Claude Fable 5 is the model that everyone gets to use. It's a class that sits above Opus, but it's heavily restricted. It comes with a lot of safeguards around it because version 2, Claude Mythos 5, is the unrestricted version, which poses itself as a higher cybersecurity risk than its predecessor, Mythos Preview. It also excels at creating biological compounds which could potentially be used as bioweapons. So it's only accessible by vetted partners that Anthropic approves. So this brings us to a fork in the road where the smartest, most intelligent AI model isn't accessible to everyone. Typically, for the entire history of software, you'd be able to pay for access to the same level of access that an institutional would. But this time, the new metric isn't how smart is your AI model, it's the gap between how smart is your AI model that you get access to and the ones others also get access to.

**Ejaaz** (1:11)
Well, how amazing is it that we have Mythos now available in our apps today? I think that's the really exciting takeaway is not only is it better than the Mythos Preview, but it's available inside of your app. So if you are listening to this, you can go and try Claude Fable 5 right now with those two restrictions. It won't go anywhere in your biology, it won't go anywhere in your cybersecurity, but this is the best model in the world, and it is now available to everyone to go try out. It's like every once in a while there's this new technology that forces you to reframe how you engage with the technology. I think that's been my experience so far using Fable, is that it's so different than any other model we've used, that it forces you to reframe how you engage with them. And to showcase that, I want us to go through some demos of attempts that people have done to showcase the powers and capabilities of Fable 5, this new frontier model, starting with a really bizarre demo in which Dan Schipper, who is a prominent poster on X, he recreated the library of Babel. And help me understand what's going on here, you just because I'm seeing a lot of visuals.
And I understand that it's not a image or video generating model. So how is it able to create a real world's emulation so accurate, so quickly?

**Josh** (2:25)
So the greatest part about this is it took one prompt, and he basically asked it to read a book, the book of Babel or whatever the title of the book is. And he said, I want you to read this book, and then I want you to recreate one of the concepts that is described throughout the book, which is this library of Babel, and it did so in just under an hour, I believe. And if you look visually on the screen, it is this high fidelity 3D representation of what this library looks like, and it's infinite. So you'll notice in this video that he looks down, he looks up, and it's just infinite. Books, he can access himself, and he even asked it to include some of the essays that he's written himself. This guy authors a bunch of analysis on AI, and he pulls open a piece that he wrote that is in the library of Babel. The idea of the library is that it contains every piece of text that has been ever written. So he gets access to it. It's a pretty cool example.

**Ejaaz** (3:20)
Yeah, that's super cool. The other ones that I've really noticed that it accelerated in is 3D world building, which is funny because you don't think of Anthropic as a world building model. It's not a world model. In fact, it doesn't have image generation capabilities. In fact, it doesn't have video generation capability. How is it creating all this realistic visual design assets, and it's just really good at math.
This begs the question is, how important is it to focus on image gen, on video gen, if at its core it could do all of this with math? And what we're seeing on screen here is a virtual one-to-one recreation of Yosemite National Park that was done with a simple prompt, asking it to create a recreation of it, and then the model was smart enough to go off and understand the context required in order to build an accurate representation and pull that off. It did things like it scanned the satellite imagery to figure out what the elevations were like. It pulled topographic maps that it found to figure out specifically what the heights were. It found imagery that any imagery that it could find about the park so that it can reference it and show you. I mean, look at this, resuming it on a waterfall. It feels like it's a one-to-one replica, lower fidelity, but something that can run inside of your browser. It's really impressive how far the model can go on one prompt. I think that's one of the places in which Fable stands out in particular is its ability to reason through your requests in a way that hasn't been done before.