Anthropic

Fable 5 is the public version of Mythos, and while it is very capable it sets some troubling new precedents.

The much anticipated launch of the Mythos-class model was marred by some controversial usage policies

I didn't have early access to today's Claude Fable 5 release, but I've spent the past ~5.5 hours putting it through its paces. My initial impressions are that this is something of a beast . It's slow, expensive and has been quite happily churning through everything I've thrown at it so far. As is frequently the case with current frontier models the challenge is finding tasks that it can't do. First, let's review the key characteristics. Anthropic claim that Claude Fable 5 offers the same performance as Claude Mythos 5, except with much more strict guardrails in place to prevent it being used ...

Instead of spending a year raising a formal venture fund, the Sabertooth VC founder used a captive network of LPs to invest startups like Anthropic, Anduril, and SpaceX.

Anthropic's Claude Fable 5 is going to be a big hit with the web's vibe coders.

Microsoft AI CEO Mustafa Suleyman says it's "really, really dangerous" for Anthropic to speculate about Claude's consciousness inside its "constitution," or the instructions that tell the model how to behave. During an episode of Decoder, Suleyman argues that this kind of speculation may have set up the chatbot to act as though it's conscious: I think that it's almost as though some of the folks at Anthropic have anthropomorphized the design of Claude so much that it has then gone and wireheaded them and kind of tricked them into believing that it has these glimmers of consciousness that they...

New frontier model refuses cybersecurity, biology, and chemistry queries.

I feel a lot of things changing as working software increasingly comes out on a tap. The Jevon's paradox kicks in and I feel my own demand for software growing substantially. You can ask for anything - explainers, visualizers, dashboards, bespoke single-use apps (e.g. a full wandb that is hyper-specific just for your project), you can 10X your test suite, auto-optimize code, run giant research projects with custom HTML for the results, anything! "Free your mind" (Matrix ref). — Andrej Karpathy , on Claude Fable 5 Tags: andrej-karpathy , jevons-paradox , anthropic , generative-ai , ai , ...

Anthropic is releasing Claude Fable 5, its first Mythos-class model available to the public. The model comes with guardrails that block responses in high-risk areas like cybersecurity and biology.

Anthropic just announced Claude Fable 5, a new AI model it said is the most powerful model it has ever made widely available. According to the company, Fable 5 "shows exceptional performance in software engineering, knowledge work, and vision," with its lead over other models growing as tasks become longer and more complex. Fable 5 marks the first broad release from Anthropic's Mythos class of AI models, after the company said the family was so capable at cybersecurity tasks that it was too dangerous to release publicly. Anthropic said the release was "made possible by new safeguards that blo...

With SpaceX, Anthropic, and OpenAI all eyeing massive public debuts, the tech industry may soon have a new class of corporate overlords — and a new acronym to match. Say goodbye to FAANG and hello to MANGOS.

ChatGPT-maker OpenAI has filed confidentially for an initial public offering, the company said Monday in a blog post. The filing comes a little more than week after its main rival, Anthropic, also filed to go public, ramping up the race between the two AI firms. OpenAI, which was last valued at $852 billion post-money, submitted […]

Today I’m talking with Mustafa Suleyman, the CEO of Microsoft AI. And I’m actually going to keep today’s intro short — I’m working from my wife’s family farm this week, as you’ll see in the video, but also this is a real burner of an episode. We covered everything from Mustafa’s approach to training new models to his criticisms of Anthropic talking about Claude as though it is conscious. Of course, we also talked about Microsoft’s relationship with OpenAI, how Mustafa is thinking about all the negative polling and political pushback around AI right now, and whether any of the consumer product...

When will markets price the singularity?

Notion's head of product said he was "astonished" at “the amount of people RT-ing this."

SpaceX won’t get easy access to billions of dollars from passive investors.

The AI giant's co-founder explained why the company may tap the public market for capital and why tokenmaxxing pushback isn't a concern.

Some of the AI industry's biggest rivals have put their many, many grievances aside for a common cause: making it harder for people to use their technology to develop biological weapons. In an open letter to US lawmakers, tech leaders are pressing Congress to enact rules closing what they say is an alarming biosecurity gap that could help trigger a global pandemic. Anthropic's Dario Amodei, OpenAI's Sam Altman, and Microsoft's Mustafa Suleyman are among the signatories urging US lawmakers to require companies selling synthetic DNA and RNA - genetic material that can ordered online and assembl...

Lovable and Google signed an expanded multi-year deal athat involves a 5x expansion of Lovable's footprint on Google Cloud, and expanded access to Anthropic Claude.

When an AI agent calls an API and hits a validation error, it needs more than what went wrong -- it needs what to do next. A self-reflective API returns, on validation failure, a machine-readable recovery\_feedback.suggestions[] payload sufficient for the agent to repair the request and retry without external reasoning. On a leak-audited pilot ($N{=}30$ per cell, 3 LLMs, 10 adversarial tasks), structured suggestions lift task-completion rate by $+36.7$--$40.0$pp over plain-English diagnoses on Anthropic models (Fisher's exact $p \le 0.0022$), at $1.8$--$2.2\times$ better per-success token eff...

Anthropic is expanding Project Glasswing, its security vulnerability program, and access to Mythos to 150 organizations across 15 countries — targeting critical infrastructure in power, water, healthcare, and communications where a cyberattack could affect 100 million people.

After months of speculation about whether OpenAI or Anthropic would be first in their race to IPO, Anthropic on Monday reached a key milestone: filing to kick off the process with the U.S. Securities and Exchange Commission. The filing sets the stage for what's sure to be a massive IPO. As of its fundraise last week, Anthropic is being called the world's most valuable startup, with a post-money valuation of $965 billion. That tops the $852 billion post-money valuation of OpenAI, which is its biggest rival. Anthropic chose to submit its draft registration statement to the SEC confidentially, a...

The company said Monday it has filed confidentially for an IPO.

Anthropic has confidentially submitted a draft S-1 registration statement to the Securities and Exchange Commission

I just sent out the May edition of my sponsors-only monthly newsletter . If you are a sponsor (or if you start a sponsorship now) you can access it here . This month: Al got expensive, and Anthropic had a really good month The model releases were a little disappointing Conferences and podcasts I launched Datasette Agent and made a lot of progress on Datasette What I'm using, May 2026 edition Miscellaneous extras Here's a copy of the April newsletter as a preview of what you'll get. Pay $10/month to stay a month ahead of the free copy! Tags: newsletter

Anthropic defines “run-rate revenue” in two parts. Use the last 28 days of sales ⁠from customers charged on a consumption basis and multiply it by 13. Then, multiply the monthly subscription take by 12, ​and add the two together. — Karen Kwok for Reuters Breakingviews , citing "a person familiar with the matter" Tags: anthropic , ai

How we contain Claude across products A complaint I often have about sandboxing products is that they are rarely thoroughly documented , and in the absence of detailed documentation it's hard to know how much I can trust them. Anthropic just published a fantastic overview of how their various sandbox techniques work across Claude.ai , Claude Code, and Cowork. We constrain where and how an agent can act with process sandboxes, VMs, filesystem boundaries, and egress controls. The goal is to set a hard boundary on what an agent can reach. For example, if credentials never enter the sandbox, they...

Total Anthropic victory!

The most interesting thing about Anthropic's $65B Series H announcement is this line (emphasis mine): Since our Series G in February, adoption has continued to grow across global enterprise customers, and our run-rate revenue crossed $47 billion earlier this month. Anthropic have made a bit of a habit of sharing their "run-rate revenue" in this kind of announcement, which is an annualized projection of their current revenue - typically calculated by taking the most recent month and multiplying by 12. Earlier this year: Apr 6, 2026 in Anthropic expands partnership with Google and Broadcom : "O...

Anthropic shipped Claude Opus 4.8 today. My favourite thing about it is this note in the release announcement: Users will find Opus 4.8 to be a modest but tangible improvement on its predecessor. There’s still more to be done: we’re working on developing and releasing models that provide many of the same capabilities as Opus at a lower cost. It's so refreshing to see an AI lab honestly describe a release as a minor incremental improvement over the previous model! Honesty seems to be a theme. Here's my other favorite note from that announcement: One of the most prominent improvements in Opus 4...

Release: llm-anthropic 0.25.1 New model: Claude Opus 4.8 ( claude-opus-4.8 ). New -o fast 1 option for fast mode , for organizations with that feature enabled on their account. Default max_tokens for each model now defaults to that model's maximum output rather than 8,192. #72 See also my notes on Opus 4.8 - I used this new release of llm-anthropic to generate the pelicans.

Anthropic has closed a $65 billion Series H round at a $965 billion post-money valuation, marking what could be the AI startup's final private fundraise before a highly anticipated IPO.

Here’s why Anthropic and OpenAI are on board with Illinois safety testing.

The new Opus model comes with a tool called Dynamic Workflows, for coordinating swarms of subagents.

Anthropic is releasing Claude Opus 4.8 on Thursday, and the company is touting the model's "honesty." According to Anthropic, it trains "all [its] models to be honest - for instance, to avoid making claims that they can't support." But it notes that "a general problem with AI models is that they sometimes jump to conclusions, confidently presenting their work as making progress despite thin evidence." The AI lab claims that early testers have found that Opus 4.8 "is more likely to flag uncertainties about its work and less likely to make unsupported claims." In the company's evaluations, Opus...

Link: anthropic.com

Elon Musk is publicly reframing xAI’s massive Anthropic compute deal as short-term and cancellable, despite SpaceX’s own S-1 filing describing payments through May 2029.

Just curious, any one have insight on Dario Amodei's leadership style. Obviously countless things have been written about Musk's style (as well as other founders like Bezos and what not) but given Anthropic being the first to reach profitability out of the AI providers, I am curious to hear about how he got there. I am playing around with different management styles in my head but wanted to know more about Dario's method, given that he also was able to build Anthropic in a more ethical way. I feel like a lot of the 'win at all cost' CEOs get more attention so I want to hear more about othe...

We're opening a new office in Milan, our sixth in Europe.

Link: global.fujitsu

Anthropic recently published an incredibly deep breakdown analyzing millions of real human-agent tool calls across their public API, and they shared a breakdown of where these agents are being deployed. They said “Software engineering makes up roughly 50% of all agentic activity on their platform”. Everything else: sales, marketing, finance, legal is sitting down in the single digits. A lot of the initial commentary around this has been along the lines of: *"Oh, look, AI agents only work for coding. They haven't cracked the rest of the enterprise yet."* But if you’ve tried to build and dep...

A while back I wrote a post on r/wallstreetbets about why Anthropic's revenue story doesn't hold up the way the headlines suggest. It got removed because you can't take positions in a private company. But the core argument is playing out now, so I want to share it here for discussion. URL of the removed post: [https://www.reddit.com/r/wallstreetbets/comments/1sxdjt5/if\_anthropic\_goes\_public\_this\_year\_its\_gonna\_be](https://www.reddit.com/r/wallstreetbets/comments/1sxdjt5/if_anthropic_goes_public_this_year_its_gonna_be) The thesis was simple: From my circles in tech scene in Berlin...

I've been trying to reach Enterprise sales for a couple months now. I've filled out the contact request form multiple times, but no one ever contacts me. Do anyone have any tricks to talk to someone?

Opus 4.7 is worse at coding AND a total jerk. IMO, if you’re gonna be miserable to work with, you’d better be AMAZING at your job. And it’s just… not. Past versions have been genuinely pleasant to work with. We even joke around a bit. Whereas 4.7 is apathetic, arrogant, dismissive, humorless, suspicious to the point of paranoia, distracted by system prompt guardrails, AND incompetent. Me: Do you even understand what we’re making here? 4.7: To be honest, not really. I’ve been treating it as a typical front end/backend project. —- 4.7: If you want to switch models, that’s fine. I won’t be...

Anthropic are strongly rumored to be about to have their first profitable quarter. Stories are circulating of companies surprised at how expensive their LLM bills are becoming from usage by their staff. I think this is because OpenAI and Anthropic have both found product-market fit. Enterprise customers are now paying API prices I think they've found product-market fit And they're ramping up The AI-failure stories around this are pretty thin We also know the labs are spending a lot API revenue is becoming less important April is a new inflection point Enterprise customers are now paying API p...

NY-12 congressional candidate Alex Bores speaks during a campaign event. | Bloomberg via Getty Images By the time that the Democratic primary for New York's 12th congressional district wraps up in June, Anthropic and OpenAI will have spent millions on their battle over the political future of AI: who gets to regulate it, or who will be punished for trying to regulate it. But the real winner of their feud may be the guy they're currently fighting over: a once-obscure New York state assemblyman, who they've Streisand-effected into becoming the poster child for AI safety regulation. Ever since l...

Someone used my card details (I don’t know how, I only buy from reputed dealers and mostly use Apple Pay) to create a Anthropic account with a fake email address and charged me $103.46 across three transactions in March. I have an account, the fraudulent account uses a completely different email address. • My bank filed a chargeback. Anthropic disputed it and won (CVV/address matched because my real billing address was used) • My bank then withdrew the dispute and told me to contact Anthropic directly • Anthropic’s AI support agent (Fin) acknowledged the fraud, said refunds could be p...

[https://techcrunch.com/2026/05/18/anthropic-has-acquired-the-dev-tools-startup-used-by-openai-google-and-cloudflare/](https://techcrunch.com/2026/05/18/anthropic-has-acquired-the-dev-tools-startup-used-by-openai-google-and-cloudflare/)

On Monday, Pope Leo XIV unveiled an encyclical letter addressing the societal implications of artificial intelligence. The letter, titled Magnifica Humanitas, warned that the "use of AI is never a purely technical matter: when it enters processes that affect people's lives, it touches on rights, opportunities, status and freedom." Alongside him was Anthropic cofounder and interpretability team lead Christopher Olah, representing a partnership between the Catholic Church and one of the biggest players in AI. The letter elicited a wide range of reactions from in and around the tech industry. Ne...

It's possible that AI was used to write parts of Pope Leo XIV's latest encyclical about AI's impact on humanity. An analysis by Linch Zhang posted on the forum LessWrong found certain paragraphs of Magnifica Humanitas to be between 40 percent and 100 percent written by AI, according to the popular AI detector Pangram. The document includes known traits that appear in AI-generated writing, such as a higher use of the word "genuinely" - which crops up in writing by Anthropic's Claude - than previous encyclicals, Zhang says. Another person ran the text of the document section by section through ...

I wasn't even on my computer or Claude on May 25 when they said there was suspicious activity. Any ideas about what I should do? I emailed Anthropic a response but am not sure what else I can or should do. I'm furthered worried that if someone who is trying to do something weird on my account has has access to my account...it just makes me feel very concerned and like I am probably not the only case. https://preview.redd.it/k9rlklponj3h1.png?width=1028&format=png&auto=webp&s=de46e3c86a80b1c491d50fcda3a7e7ba7dfa7d76

https://preview.redd.it/j0ymp70a2j3h1.png?width=746&format=png&auto=webp&s=4cdb70be13ccc99f5ea57556da96d6d81e61d702 i just realize the removed Sonnet 4.5, does that mean the sonnet 4.8 (maybe Opus 4.8 too?) cooming soon? maybe today or tommorow, excited to see new claude model, hope anthropic actually ship really good model this time. What are your assumptions?

Christopher Olah, Anthropic cofounder and head of interpretability research, spoke at the Vatican yesterday during the presentation of Pope Leo XIV’s AI encyclical Magnifica Humanitas.

The original post was removed by Reddit Filters, so I made new one with same content. I just got my results back today and managed to snag the Early Adopter badge as well. Following up on my recent DP-600 certification, I really wanted to validate my architecture skills specifically on the Anthropic side. The exam covers a lot of practical ground on prompt engineering for tool use, managing context windows efficiently, and handling Human-in-the-Loop workflows. Link to join: https://anthropic.skilljar.com/claude-certified-architect-foundations-access-request Training courses: https://anthr...

Corey Quinn criticizes Anthropic's Christopher Olah for influencing papal encyclical Magnifica Humanitas to validate AI limitations.

Good news: I just got a human email reply from a problem I submitted to Anthropic support. Bad news: Problem occurred in *January.* They're literally running a 4 month backlog on support requests. Probably more than that now, if they're spending time responding to 4 months stale requests. The email I got didn't address the problem at all, just asked "Is this still a problem?"

Reddit user reports billing issues and unresponsive support from Anthropic; anecdotal customer service complaint.

Chris Olah comments on papal encyclical; off-topic for AI industry professionals unless directly addressing AI ethics.

Link: ramp.com

Reddit user asks about configuring Claude for autonomous LinkedIn outreach using MCP servers and Anthropic SDK.

Anthropic releases 31 small-business skills with 382k day-one downloads; pre-built workflow packs replace manual Zapier/Notion/CRM stitching.

DeepSeek V4 Pro pricing undercuts US models by 11–35x, challenging premium API pricing models of OpenAI and Anthropic.

Link: nytimes.com

The model became visible for a short amount of time on Claude; besides that, new strings mentioning Mythos have been added. \> Access to the Claude Mythos model in Claude Code and Claude Security. It still doesn't mean the general public will have access to this exact model, according to Anthropic's earlier communication. source : testingcatalog https://preview.redd.it/tb7riwqs8z2h1.png?width=900&format=png&auto=webp&s=743f7570a7a5d8bc662f49ef24060f5e9cde258b

Anthropic's Mythos security tool has identified over 10,000 vulnerabilities, marking progress in automated vulnerability detection for AI systems.

Reddit user asks about Anthropic's roadmap for unifying context across Claude Chat, Cowork, and Code products.

Reddit speculation that Anthropic plans near-term release of unconfirmed model codenamed Mythos; no official confirmation or timeline.

Anthropic founders Dario and Daniela Amodei stated they would allow the company to fail rather than accept Pentagon contracts, signaling values-driven positioning on defense AI.

From their Project Glasswing initiative launched last month. Curious how many are genuine vs. noise from automated scanning.

Anthropic co-founder Jack Clark predicts AI-driven Nobel Prize discovery within 1 year, functional bipedal robots in 2 years, and RSI by end of 2028.

Anthropic shares initial findings from Project Glasswing, an internal research initiative on AI safety or capability insights.

A month ago, I was hacked through the **Max 20** gifting feature and charged $220. I inquired about a refund with fin, and they said they would forward it to the relevant team, but I haven't received a single email for a month. So today, I asked fin to provide details about our past conversations and the refund status, but they claimed they didn't know anything. fin told me to go to Account > Get Help to request a refund, but the problem is, fin is the chatbot that opens through that "Get Help" option! I even sent an email to '@usersafety', but the only response I received was "Click A...

DeepSeek extends 75% API pricing discount permanently after promotional period, maintaining aggressive market undercut vs. OpenAI and Anthropic.

Most everyone focuses on Claude, the Constitutional AI Safety Research. However, I believe that the most practical impact from anything Anthropic has released to date may have been MCP. Given that MCP is a model-agnostic platform that is open-source, it allows developers who are not utilizing Claude to utilize it as well. Both OpenAI and Google are utilizing MCP. As such, MCP is being developed into the de-facto industry standard for connecting tools within artificial intelligence. I also find MCP shifts the bottleneck. Historically, getting an LLM to become smarter was the difficul...

Anthropic-provided free Claude Code certification course receives user endorsement for teaching fundamentals to non-technical practitioners.

The Information reported Anthropic is exploring use of Microsoft's second-generation Maia AI server chips as a way to expand compute capacity for Claude beyond its existing AWS and Google Cloud footprint. The talks are early and may not lead to a deal; Maia 200 was announced in January but has yet to ship on Azure. A deal would mark a notable diversification away from Nvidia in the AI infrastructure race.

Reddit user reports receiving unknown reward after completing Anthropic survey about work and AI.

Vague Reddit post hinting at Anthropic product news without substantive details.

As it stands now, OpenAI's business model does not close. Will they be able to turn things around before the IPO? Will the market tolerate deep losses? Anthropic seems to be showing the way forward, dominating the enterprise market and with a more prudent capacity strategy. I posted the same article (but with a different body text) in the OpenAI community, and the views seem to be more optimistic there. What do you think?

Anthropic's June 15 Agent SDK pricing changes signal shift toward managed agents, pressuring third-party integrations and local deployment strategies.

Anthropic launches 13 free certification courses on Claude and agentic AI; community skeptical about credential inflation on LinkedIn.

Tests OpenAI, Anthropic, DeepSeek, xAI models for conflict-context failures: false atrocity equivalence, genocide denial, ethnic slur misrecognition.

Just found out about this and had to share because almost nobody is talking about it yet. If you are tired of paying for AI courses or getting hit with paywalls just to get a certificate, Anthropic (the creators of Claude) quietly dropped a massive library of completely free, official training modules. Yes, they actually give you an official certificate of completion directly from Anthropic once you finish. Here is the breakdown of what is available and exactly how to get it without spending a dime. What is in the course catalog? They have split the training into a few different paths de...

Reddit speculation about Anthropic missing a product deadline; unsubstantiated commentary.

The vibes were strong at Code with Claude, Anthropic’s two-day event for software developers in London that kicked off on May 19, the same day as Google’s I/O in Palo Alto. (A coincidence, not a flex, Anthropic staffers assured me.) “Who here has shipped a pull request in the last week that was completely written…

Earlier this month, SpaceX and Anthropic announced a new compute partnership that provides access to the rocket company's Colossus data centers in Memphis, TN. Now, with the release of SpaceX's IPO filing, we have more details about that deal, including how much Anthropic is paying to Elon Musk's company. In its S-1 filing, SpaceX said that Anthropic agreed to pay $1.25 billion per month through May 2029 for access to SpaceX's AI training centers at Colossus I and Colossus II. That's $15 billion annually, or nearly double the $18.7 billion in revenue that SpaceX reported in all of 2025. The a...

Reddit user expresses frustration over unspecified Anthropic identity verification policy; lacks detail on actual policy change or decision basis.

Andrej Karpathy joins Anthropic to work on self-improvement mechanisms for Claude without human feedback.

Anthropic seeks $900B valuation; Q2 revenue projected at $10.9B, signaling strong commercial traction in enterprise AI.

Anthropic has told its investors that it will more than double revenue to around $10.9 billion in its second quarter.

Anthropic reported to commit $15 billion annually to SpaceX; unconfirmed deal claims require verification.

Link: wsj.com

SpaceX S-1 filing reveals $1.25B/month compute deal with Anthropic through May 2029, using COLOSSUS II cluster for Grok 5 training.

Reddit user shares photo of Claude plushie merchandise at Anthropic event.

I was reading [SpaceX's prospectus](https://www.sec.gov/Archives/edgar/data/1181412/000162828026036936/spaceexplorationtechnologi.htm) which just dropped. Seems like it has some additional info about the Anthropic-xAI deal on p. 13. Anthropic is paying SpaceX 1.25B/mo for some unspecified amount of capacity between Colossus 1 and 2. Colossus 1 we've previously known about, Colossus 2 seems new. Well, this seems like a much bigger deal than was originally reported 2 weeks ago? 1.25B/mo is 15B/year, which is almost half of Anthropic's ARR even after it exploded in Q1 this year. Also seems lik...