Anthropic Just Dropped Claude Mythos and Fable 5 (Full Breakdown)

Enthropic just dropped Claude Fable 5 and Claude Mythos 5. So I read through this entire article and have been playing around with it myself. As you could see, I have this directly inside of Claude now. So in this video, I'm going to break down this entire article so you don't have to read the whole thing. And do not worry, I'm not going to sit and just hype this up. I'm going to break down key things that changed that we need to note. We're going to talk about availability, pricing, what matters, and what we could actually expect from this new model release from Enthropic. So, without further ado, let's dive right into this. All right, so first things first, if you do want to read this entire article, it is pretty hefty. There's going to be a link in the description for you to do so. However, I went through and made a bite-sized breakdown so you could understand the TLDDR of this entire release. I don't want to waste any more time. Let's dive right into these talking points that I found after reading this article. So, Anthropic said, "Today we're launching Claude Fable 5, a mythos class model we've made safe for general use." So, real quickly, if you don't know what Claude Methos is, this is the model that Enthropic gave to some of the biggest companies a couple of months ago in order to test out the capabilities because they did state that this model was too powerful to release to the public and there was tons of potential for cyber security issues. So, this is a watered down version of that mythos model that they're now releasing to the consumer public like you and I. Now, it says here, "Fable 5's capabilities exceed those of any model we've made generally available. It is state-of-the-art on nearly all test benchmarks of AI capability, vision, scientific research, and many other areas, the longer and more complex tasks, the larger Fable 5's lead over other models. Now, let's quickly talk about the risks before we break down some of the benchmarks and talk about actually how good this model is. So, Enthropic stated that releasing a model with this capability comes with a risk. So, without safeguards, Fable 5's capabilities in areas like cyber security could be misused and cause serious damage. We've therefore launched the model with safeguards. That means queries on some topics will instead receive as a response from our next most capable model, Claude Opus 4.8. And I do want to talk about this real quickly cuz in preparation for this video, I've been testing out the Fable 5 model. And I would say about 75% of the prompts that I gave it, I would get this error message right here. It says chat paused. This model has safety measures that flags messages on most cyber security or biological topics. they may flag safe normal content as well. And it basically prompted me to continue with this prompt using Claude Sonnet 4.6 or other models. So this means if there's something that Anthropic maybe flags that it could be high risk to use this model for, it's going to route you to the next best model that they think will be good to actually answer that question. Which to be honest, after testing this a little bit, you know, before this video has been quite annoying. You know, like I said, probably 75% of the time I've prompted Fable 5 and tried to get a response to see what it's capable of. I get that message saying it needs to use a different model, which is pretty annoying. Now, moving on to the next point here. It says that they are releasing to a small group of cyber defenders and infrastructure providers. They're launching Claude Mythos 5. And a key point here is it says this is the same underlying model as Fable 5, but with the safeguards lifted in some areas. Mythos 5 will initially be deployed through project Glass Wing in collaboration with the US government as an upgrade to Claude Mythos preview. Very interesting as they're giving the US government access this to make sure that you know this isn't being used by malicious people which I guess makes sense. I don't want to get political here but it sounds like Claude Methos 5 is a next step above Fable 5 and they don't want to just release this to the public yet and that's been the case over the past couple months since they have been doing this prior. But it sounds like now they're releasing Claude Mythos 5 to you know other people as well. Then it says in consultation with the US government we plan to steadily expand access to Claude Methos 5 just like I stated above. And again if you don't have any prior context on Mythos the model that you know has been out for a couple of months that they released to only you know a certain amount of companies. Cyber security is the main issue here. So Mythos class models excel at discovering and exploiting software vulnerabilities. They can make cyber security attacks substantially easier and cheaper to commit. So those are some of the risks. We already knew that Anthropic was trying to handpick who they were going to give access to Claude Mythos to. Now let's talk about the benchmarks real quickly with Fable 5 and Mythos 5. So I don't want to speak in only a developer language here. So let's quickly just talk about this and what actually matters. Now Opus 4.8 is the model that they just released literally about a week and a half ago. And as you could see for Aentic coding that was 69.2 2% whereas Claude Mythos 5 and Fable 5 are at 80.3 for agentic coding. And this to me honestly is a huge step up. So I'm really interested to see this in practice when using something like Claude Code because everybody in their mom is talking about GPT 5.5 and Codeex right now saying it's the best coding model, but apparently according to this benchmark that is not the case anymore. Then again, I don't want to bore you going through all of these numbers because to be honest, sometimes I feel like this can be a bit fabricated. And honestly, it doesn't really mean much until we test it out and, you know, try it ourselves. But all we need to know is this is basically better than all these different models aside from Claude Mythos preview, which is the model that, you know, isn't released to the general public yet. Now, here's the part of the article where it talks about software engineering. So it said during early testing, Stripe reported that Fable 5 compressed months of engineering into days, which is absolutely crazy if you think about it. The fact that it used to take real life software engineers months to write this code, it can now do that in days with this new model. And again, this is with a Fable 5 model. This isn't even Mythos 5 in Mythos 5 preview, which, you know, the public doesn't have access to yet. Then if I come down here, it says Fable 5 scores highest among Frontier models even at medium effort level. So to show you what I mean, if I come back over to Claude, I could actually go ahead click on, you know, this little button here and we could see our different models that we could choose from. We have Fable 5 that says included until June 22nd. We have Opus 4.8, which again dropped to like about a week, a week and a half ago. And then we could also see we have this effort level here that we could select. So it's always going to default to high. However, we have extra and we have max as well as medium and low if we ever want to use those. But what Enthropic is saying is that even if we are on the medium level, this is better than all of the other Frontier models out there, which is good news if you want to use a better, more capable model, but not have to pay the actual pricing for Fable 5 High. And stick with me cuz we're going to talk about pricing later on in this video. And this really did surprise me in terms of how much it costs. Next, apparently there's a pretty big upgrade when it comes to Vision. So, Fable 5 is a new state-of-the-art model for tasks including vision. It can extract precise numbers from detailed scientific figures and can perform complex vision-based tasks like rebuilding a web app source code from screenshots alone, which is pretty crazy. And again, this goes to show that it's not only good at vision tasks, but it's also really good when it comes to agent coding as well. And vision is one of the big things for me that's really important for these models that I think we really need to master because when it comes to being able to use computer use where Claude and these different models can go and use our computer, it needs to be really good at being able to see what's actually on our screen. Now on to the part that everybody is probably interested in. This is pricing. Pricing for both of these different models, both Mythos 5 and Fable 5. These are going to cost $10 per million input tokens and $50 per million output tokens. And you might not be familiar with what that even means. So, let's break this down a little bit more. Let's compare this to Opus 4.8, which is the model that just came out a couple of weeks ago. This right now, if you're using Opus 4.8, is 5 million input tokens and 25 million output tokens. So, this means that both Fable and Mythos are going to be two times more expensive than the Opus models, which to be honest isn't as much as people were assuming. Some people on Twitter were thinking that this was going to be maybe 10 times more expensive. So, I guess this is good news for us if we do want to use these models and not burn through all of our tokens inside of our clawed accounts. Now, this is another thing that's pretty interesting. So it says drug design using Mthos 5, our internal protein design experts accelerated aspects of the drug design process by around 10 times. And then this part right here is pretty mind-blowing, so stick with me. It says, "In one example, they found that Methos 5 with protein design and bioinformatics tools, but no human assistance matches or beats skilled human operators. In doing so, the model executes all the tasks that are normally completed by a scientist. I know nothing when it comes to medical research and drug design, but if Anthropic is claiming this, this is pretty crazy when we do think about it. So, this should be available to everybody now. I at least believe this will be available to the pro plans and the max plans. I'm not sure if it's going to roll out instantly to the free plan, but go ahead check inside of either your Claude desktop app or your Claude web app. And then you should be able to see this mode right here where it says Fable 5. You could select this. You could always choose from Opus 4.8, Which honestly, if you are using Claude and you're not a power user, I would probably suggest not to use Fable 5 right now because it is double the price and I know a lot of you guys are already running into issues when it comes to token usage inside of your Claude account. I'll be testing this ruthlessly over the coming days. So, make sure to subscribe for more videos like this if you are interested. And anyways, I hope you guys have a good video and I look forward to seeing you in the next one. Cheers.