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Claude Fable 5
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Anthropic released Claude Fable 5, a guardrailed Mythos-class model, to the public and Mythos 5 to trusted partners. OpenAI confidentially filed for an IPO. Hackers injected credential-stealing malware into 70+ Microsoft GitHub repos, and Apple details its new Gemini-based foundation models.
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Welcome to the Techbrew. Write home for Tuesday, June 9, 2026 I'm Brian McCullough. Today Anthropic released Claude Fable 5, A Guard Railed Mythos class model to you and me. OpenAI confidentially filed for an IPO. Hackers injected credential stealing malware into more than 70 Microsoft GitHub repos and takes on Apple's new AI foundation model and strategy. Here's what you missed today in the world of tech. Think you have to build your own search engine scraping infrastructure? Think again folks. SERP API can take care of all your search engine scraping needs. It lets AI products access real time web search data programmatically, no scraping infrastructure required. Their APIs offer structured JSON data from all the top search engines, including Google, Amazon and YouTube. Top tech companies already use SERP API to power their AI agents, their market intelligence tools, and their automated research workflows. See how it can help you and your team. Serp API provides 250 free searches per month. Go check it out at serpapi.com that's Serp serpapi.com A little birdie told me this was coming, so that's why I've been holding on releasing the show just a bit. Today Anthropic just released Claude Fable 5, what they're calling a safe Mythos class model that it says can't be used for cyber attacks to the public and also Claude Mythos 5 to trusted organizations. Quoting Wired, Anthropic released two new AI models called Claude Fable 5 and Claude Mythos 5 on Tuesday, which the company says have greater capabilities than the Mythos Preview model it released in April to a limited set of tech industry partners. Anthropic has said the initial limited release stemmed from concerns that the model's capabilities could be exploited by bad actors to develop hacking tools that could catch defenders off guard. Anthropic is currently only releasing Claude Mythos 5 to a limited set of industry partners, many of which received access to Mythos Preview, and the company says it is collaborating with the US government on the rollout. Claude Fable 5, which is being publicly released uses the same underlying model as mythos 5 but will have guardrails in place at launch, the company said Tuesday. That will block the model from answering many questions related to cybersecurity, biology and chemistry. These requests will instead be rerouted to an older AI model, Claude Opus 4.8. If anthropic suspects a user is trying to conduct distillation training, a smaller AI model offer larger AI models responses on Claude Fable 5. Those requests will also be rerouted to Cloud Opus 4.8, the company says. In an interview with Wired, Anthropic's head of product management, Diane Penn says that the company has been grappling with the question of how to handle Mythos software vulnerability, discovery abilities and other advanced capabilities since before its April, but that testing and user input since then has helped to hone the strategy. We're trying to make improvements in a way that's beneficial even if we don't have the perfect solution for every use case to start, penn says. Out of all of the different approaches, this emerged as the most viable and the best one. We just ended up feeling like this was the best product choice for users to get the maximum value out of Fable 5. For now, Penn says that the protective mechanism is built to err on the side of caution, meaning some user queries may be routed to less capable AI if they're benign. Over time, Anthropic hopes to make its classifiers more precise, but Penn says this was the only safe way the company could release the model broadly at this time. The company said on Tuesday that in addition to offering Claude Methos five to project glasswing partners, it is also giving access to select biology researchers. And additionally, Anthropic noted in its blog post about Tuesday's launch that it is providing unrestricted versions of to those small group of customers until our trusted access program is available, hinting at future plans to expand access even more. Since the Mythos launch in April, Anthropic has repeatedly emphasized that eventually its competitors in both the private and even open weight spaces will inevitably also offer models with Mythos level capabilities. Anthropic also said that internal and external Red team tests of Fable 5 found no universal jailbreaks using the model. It will keep user traffic for 30 days in its archives and records, though, thus aligning with President Trump's recent AI executive order. Anthropic says Fable 5 uses conservative safety classifiers that trigger a fallback to Claude Opus 4.8 and about 5% of sessions, again in areas like cybersecurity. And one more important thing quoting ZDNet, an unnamed representative of vibe coding platform maker Base44 said Fable is much deeper and better at one shotting full apps, and its tool calling is a excellent genspark, which provides an all in one AI workspace. A representative there from the company said that Fable came out number one on our evals, winning head to head against every model we tested. It was significantly stronger on the hardest tasks in the set, UI design and game coding. A representative from E commerce marketplace Rakuten said, at the highest effort, Fable reflects on and validates its own work for us. That's what makes highly autonomous operations possible. The extra thinking pays for itself. Speaking of, payment pricing for Fable 5 and the new Mythos 5 release is $10 per million input tokens and $50 per million output tokens. That's about twice the price of Claude Opus 4.8. So if you thought that token sticker shock was bad before, well, you know. Quoting TechCrunch Many enterprises are growing critical of AI costs after seeing the bills come in or blowing through their yearly AI budgets. Early advanced models like Opus 4point exacerbate those issues with advanced reasoning skills that can split a single request into multiple tasks. Anthropic said it expects demand for Fable 5 to be very high and difficult to predict, and indeed some like shopping rewards platform Rakuten might think the upside is worth the price point. End quote. Now it is OpenAI that has confidentially filed for an IPO, saying it has not decided on timing yet, as there are things we want to do that are likely easier as a private company. Quoting CNBC OpenAI CFO Sarah Fryer told CNBC in April that it's good hygiene for a business of OpenAI's size to look and feel and act like a public company, but she wouldn't commit on a specific IPO timeline. OpenAI said Monday it hasn't decided on timing. OpenAI also plans to facilitate a tender offer that will allow employees to sell shares at the latest valuation, which was $852 billion, post money and alleviate some near term pressure for liquidity, according to a person familiar with the plans who asked not to be named because the details are private. The company has been working with banks, including Goldman Sachs and Morgan Stanley on the filing. As CNBC previously reported, they're the two firms listed at the top of SpaceX's filing as well. SpaceX kicked off a roadshow last week. OpenAI, Anthropic and Google are all named as some of SpaceX's key competitors in AI, according to the filing. A week ago, Anthropic announced its confidential IPO filing. Shortly before that, the company closed a funding round at a $965 billion valuation, topping OpenAI, which was valued at $852 billion in late March. Depending on how SpaceX's offering is received, Anthropic and OpenAI could be rushing to beat each other out due to the massive amount of capital they're trying to raise. OpenAI CEO Sam Altman will be under pressure to make his case to investors, particularly around the company's financials. OpenAI has raised more than $180 billion in funding, and it is still burning through cash as it works to secure, compute and build out infrastructure to train and run AI models. In a blog post on Monday, Altman introduced what he called the third phase of OpenAI. End Quote. Microsoft disabled more than 70 of its own repos on GitHub, including Azure. Related tools like Azure Functions, after hackers added credential stealing malware to them. Quoting TechCrunch, Microsoft has cut off access to dozens of its open source projects hosted on GitHub, as it investigates how hackers apparently breached the projects and injected password stealing malware into the code. Many of the affected projects relate to Microsoft's cloud service Azure and other tools used by developers to code with AI development apps such as Claude Code Gemini's Command Line Interface and VS Code, according to security firm cloudsmith and Community Driven Malware analysis site Open Source Malware, which were some of the first to flag the hack. The malware allowed the hackers to steal the user's passwords and other sensitive credentials when they opened the compromise tools in their AI coding apps. It is not immediately known how many people have been downloading the affected tools. Microsoft confirmed it pooled the repos as first reported by 404 Media. Microsoft spokesperson Ben Hope told TechCrunch that the company has temporarily removed some repositories as we investigated potential malicious content content. Some of these repos have been restored after review, while others may remain offline while work continues. As part of our investigation, we notified a small number of customers who may have pulled down content from the affected repositories. We will continue to investigate and if anything further is identified that requires customer action, we will reach out directly through our established support channels, added Hope. Microsoft did not immediately provide the specific number of customers affected when asked by TechCrunch. At least 70 projects belonging to Microsoft have been disabled, per a message loading when trying to access the project's pages on GitHub. A code hosting site that Microsoft owns access to this repository has been disabled by GitHub staff due to a violation of GitHub's terms of service. 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okay, you heard my skeptical take on yesterday's Apple Intelligence and Siri stuff yesterday. But here are two folks smarter than me, and they have a slightly different take. So first up, MG Siegler. From a pure AI perspective, nothing Apple showcased during their WWDC keynote yesterday was particularly groundbreaking. In fact, much of it featured capabilities long since available in other AI tools and services, in some cases years ago. And guess what? That doesn't matter. Based on what we saw yesterday, Apple is set to win in AI, at least from a consumer perspective. I know how crazy this sounds. It's not just that Apple has been viewed as behind in AI for the past few years. It's that they've been more or less a laughingstock, given how they tried to roll out Apple Intelligence two years ago and failed to the point of settling lawsuits around false advertising. But if Apple is actually able to roll out what they showcased yesterday. And I'll get to the caveats below, there's a reason to believe they can do it this time. They're about to infuriate many people and companies across a wide swath of industries. That's because Apple seems on the verge of doing what they always do, watching new products and services come about and then jumping in later with a better user experience to win the day. This annoys people because they can't just do that. So and so was doing this long ago first this was old BO lame. They can't keep getting away with this. We saw it all on display in response to the keynote yesterday, and Wall street seemed to agree with the angry mob sending the stock down in after hours trading. I'm here to tell you that none of that matters Apple Intelligence and the new Siri AI may seem underwhelming to those who live at the bleeding edge of AI, but 99% of people don't live there, and even more actually don't want to live there, but feel the need to in some way at least, lest they feel like they're being left behind in our age of AI. If ChatGPT showed AI to the masses, Apple is set to bring usage mainstream. The good news is that increasingly, most day to day usage won't require the state of the art, and in fact it increasingly may prove too expensive to use the state of the art for most tasks. Again, Apple's timing could be good here, but we won't know that for sure until Siri AI is out in the wild and competing with say, Mythos. Then again, I'm not sure how much they will actually compete. There will always be the AI power users, of which I'll certainly be one. But but most users will not be AI powered users. They'll be content to use the default, providing the default is good enough. But that's underselling Apple here, since it's really about having a good enough base layer for things like world knowledge mixed in with contextual stuff around your personal data that only they can do. It's entirely possible that we see a world where most iPhone users use Siri AI for 80% of their AI needs and then pick another model service for the other 20%. Or maybe it's even more granular with with two or more other AI services filling in specific niches. Again, we'll see. But what I see, based on what I saw yesterday, is a world where Apple takes the AI consumer lead in relatively short order. Millions of people next year walking around talking to Siri AI asking her all sorts of things and tasking her with all sorts of things. It's a mixture of the power of the default, Apple's own superior product instincts, AI seeding the consumer high ground, Google being stretched in a million different directions beyond consumer and of course helping out Apple here. Microsoft never being good at consumer, anthropic not caring about consumer, Amazon not having a smartphone yet and Meta not having the iPhone after being left for dead in AI, everything is coming up Apple again. How annoying for some. They can't keep doing this. AI becomes a new reason to get an iPhone. Forget AI PCs, this is the first true AI device if it works, end quote and then Ben Thompson quote There are actually a lot of interesting technical details about how Apple rebuilt Siri, including expanding private cloud compute to include Nvidia chips running in Google data centers, as well as a 20 billion parameter on device mixture of experts model that selects the expert on a per query basis as opposed to on a per token basis so that it can run in an iPhone's limited memory. The key strategic takeaway of these implementation details, however is is the centrality of the iPhone. Microsoft's Project Solara obviously makes sense for Microsoft given the fact that the company missed out on mobile, but it also fits with the infrastructure of AI which is in the cloud and increasingly about compute happening without a human in the loop. Apple in contrast, is heavily incentivized to preserve the iPhone's importance and by extension to focus on use cases organized around human interactions. However, it's too simplistic to reduce these approaches to a cynical analysis of incentives. Both make sense in their own right. What makes me intrigued about Project Solara is the fact that Microsoft is positioning it as purely an enterprise play, which is important because an enterprise has context about the work being done, making it more viable to build long running agents which the enterprise is willing to pay for. That context would be far more difficult to build for consumers given the need to tie together a huge number of services to get a coherent set of data over which to operate. Indeed, the only entities that can probably pull that off are Google and Apple via Android and iOS respectively. And Google is always going to be focused more on its cloud services as the point of integration instead of the device. That leaves Apple as the only company truly, dare I say it, thinking differently. And yes, the iPhone as the true core of Siri, which will work across your devices but get its differentiated context first and foremost from your iPhone, just so happens to perfectly align with Apple's business model and desire to not spend billions in Capex, but that doesn't mean it's the wrong approach. You'll be able to access all of that Capex that other companies are building on your phone. You'll just have to use an app. If you need to find something personal or work across apps, Siri will be the only one who can pull it off. As long as it's not vaporware and it appears the second time might be the charm. End quote. Nothing more for you today. Talk to you tomorrow.
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