NEW Claude Sonnet 5 coming?

**Julian Goldie** (0:00)
So we have a new announcement today, as we're looking at a new model from Anthropic coming out. So basically what's happened here is that obviously Fable 5, it got banned, and that only got released on June the 9th. So you see June the 9th, Fable 5 and Mythos 5, they both came out. Obviously public couldn't access Mythos 5, it was only for Project Glasswing, but Fable 5 was pretty insane. We were all having a great time vibe coding with it. Then it actually got shut down on June the 12th, not the 12th.
And then from here, we have announcements of a new model. Lots of rumors out today saying that a new model from Anthropic is about to drop, which is pretty exciting stuff.
So we'll talk through what it could be. There's been some announcements that basically on tests, Claude Sonnet 5 has appeared on a partner provider.
So you can see the news right here. So we are looking at Claude Sonnet 5 Other people are saying it might be, for example, something like Mythos 5.1 or Mythos 6, etc.
Pretty interesting.
But it was actually spotted today. So you can see here the news is from Astro Polo. Claude Sonnet 5 is back. A new Claude Sonnet 5 slug spotted today. The exact same thing happened in February. And we ended up with Sonnet 4.6, which then obviously got nerfed later. But essentially we are all waiting for this new model from Anthropic to drop today. You see another announcement from Andrew Curran. So a new, more capable version of Mythos has emerged from training. We don't know whether it's going to be called Mythos 5.1 or Mythos 6
Or if Anthropic will keep it internal to accelerate further development, but it has arrived. And this kind of makes sense, right? So obviously Fable 5 got taken down. I think they're going back and forth trying to get it back. It was huge for Anthropic, you know, pretty excited.
But at the same time, if they can't get the model back, then why not just create a new one and release that instead? You can see the tiers here. So you've got Haiku, you've got Sonnet 4.6, Opus 4.8, Mythos class that dropped earlier. And then we're looking at the new one that should be coming out very soon. And if we look at this as well, this Mythos class level that we're looking at, there's two different types. So there's Fable 5 with the safeguards on, that went out for public release, then it got taken down, and then you have Mythos 5 with the safeguards lifted, but that is only for Project Glasswing, Cyber Defenders, et cetera. And this was the announcement on the model getting shut down. The stated reason was national security. And basically the government believes someone have found a way to basically bypass Fable 5 And then recently a new model has appeared. So this is the part that everyone's talking about right now. This literally just got announced a few hours ago, but you know, in terms of the rumors. So Andrew Curran posted about it.
Claude Sonnet 5 appeared inside the tests as a provider. The interesting thing, is it gonna be Mythos class? Or is it gonna be Sonnet?
Or is it basically Claude Sonnet, but it's basically Mythos class? You see what I mean? There's no confirmation on that.
And obviously on the official website, there's no Claude Sonnet 5, no Mythos 5.1, no Mythos 6 listed yet. So these are rumors, it's not fully confirmed. And bear in mind as well, we're looking at GPT 5.6 coming out soon as well. So could be a busy week for looking at, if we get Sonnet 5 and GPT 5.6 in the same week, that is going to be huge. So what's actually confirmed? Let's talk about it. You know, Fable 5, Mythos 5 launched, they're one model, they got taken down, everything disabled.
What's still just rumour? A new, more capable Mythos finished training, called Sonnet 5 Slug, spotted on a partner. Could be Mythos 5.1, Mythos 6 or Sonnet 5.6, sorry, Sonnet 5, might just stay internal. This is something to note as well. They might have created it already, but just keep it internal. And then we could be looking at a July rollout after safety checks. Bear in mind that Sonnet sits way below the Mythos tier.
So if this comes out, it's probably not going to be anywhere near as good as Fable 5 That's a problem. But if it's Mythos 5.1 or 5.6 or 6, then we're looking at something super powerful. Main thing I would say that I learned from all of this, if we just take a step back, is like, if we step back from the rumor for a second, the real lesson here has nothing to do with the model name. So we had the most powerful model on Earth, three days later, it was gone from the planet. Not because it got worse, but because of a force completely outside of anyone's control. So when you look at this situation, it's like, when Fable 5 was pulled, if you built on a system, you can keep building. So for example, we have the Agent OS system, and we can keep moving. You can just swap to the next best model. If you built on the model, that's where you get stranded. So whatever happens with these models that come out this year, I would recommend that you build on a system. Don't build on the model. Two totally different things. And I'll show you an example. So if you are building on a system, you've got something like an Agent OS, you can have all your models plugged in, whatever happens, okay, Claude gets taken down, no problem. Let's plug in GLM 5.2. If you are building on the model, so for example, if you have everything built on one single model, that's kind of where you can get stranded. And that's where, for example, stuff like Fable 5 can be really annoying. So the people who built their work directly on Fable 5, hardwired to that one model, woke up stranded, their tools just stopped. Particularly anyone, you know, relied on that. The people who built on a system, a model agnostic agent OS holding their memory, their workflows or agents, didn't even break stride. You know, the moment Fable 5 went dark, they just pointed the same system at the next best model and keep shipping. So you have the same memory, same prompts, same agents, but a different engine underneath. And that's the difference here. And that's where it flips from survive to one, because the system that always points to the best model available quietly gets better every day. So when a new model like, for example, Claude Sonnet 5 comes out, they upgrade by changing one setting, whilst everyone else rebuilds some scratch. And that's really the shift I would say here.