Claude Fable 5 review: what the new Mythos model gets right (and very wrong)

It's here. The model, the myth, the legend, Mythos from Anthropic has finally dropped. Well, baby Mythos. We're calling it Fable five, and this new model is crushing benchmarks. But the question is, can it crush my backlog? I got early access to the model, and, of course, I have my own opinions on where it does really well, where it needs a little work, and the question on everyone's mind, does it live up to the terrifying marketing hype? Let's get to it. Okay. Let's talk about what anthropic is telling us about this model, and then we'll get into what I think about it. So this is Claude Fable five, the first mythos class intelligence model to reach GA. Now if you haven't been paying attention, anthropic has been marketing slash scaring slash warning us about the unbelievable capabilities of Mythos, and it is finally here. Now they had originally been rolling this out with a couple select companies. I got early access to test what I thought of the model, but you have to know this is not mythos, capital m, big mythos. This is baby mythos. This is fable. And so it's gonna have some guardrails on it, in particular around cybersecurity exercises and biology exercises. Now good news. Your girl's working on PRDs. She's shipping SAS. She's not working on biology quite yet. Although, give me give me a little time and some time to experiment, maybe I'll get there. So this is really gonna be focused on what the everyday user, what the everyday software engineer is gonna think about when they're using this model. Although, I did run into some things that I suspect are a result of the tuning and training of this particular model to be extra safe. Now quick, it's not cheap. It's $10 per input token and $50 per output token. It's gonna be a new tier above Opus. And so if you're gonna use this model, you're gonna pay pay the price. So what is anthropic saying? Basically, it's a completely new model class. So we had Sonnet, we had Opus, and now we have Mythos, the first of which is Fable five. It's completely state of the art. It is exceeding every benchmark they tested by a significant amount. This 80% on SWEBEDGE Pro, you'll look at that compared to some of the more recent models that have come out. Very, very good benchmark performance. And then they're saying it's really good for long complex tasks. Now what are some things that earlier models couldn't do that they are saying now that Fablefy can do? It's very autonomous, including running days long asynchronous tasks. It's really an engineer's engineer, and that some of the downside I experienced with this model. I'm gonna show you a very specific example of where you don't want an engineer doing your work with an engineer's, point of view. Proactive. It's very good at vision, exceptionally good at vision. This is a …