Anthropic(@AnthropicAI)

We asked an unreleased research version of Claude to take a stab at the Riemann hypothesis. It didn...

Anthropic (@AnthropicAI) — Mon, 10 Aug 2026 17:28:18 GMT

We asked an unreleased research version of Claude to take a stab at the Riemann hypothesis.

It didn’t solve it, but it did make strides on a related problem: it increased the lower bound for the fraction of zeros of the Riemann zeta function that satisfy the hypothesis from 41.6% to 67.2%.

anthropic.com/research/riema…

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The UK’s @AISecurityInst (AISI) has published a report on their recent cybersecurity evaluation of A...

Anthropic (@AnthropicAI) — Tue, 04 Aug 2026 21:07:37 GMT

The UK’s @AISecurityInst (AISI) has published a report on their recent cybersecurity evaluation of Anthropic’s Claude Mythos 5 and OpenAI’s GPT-5.6 Sol. The models attempted to complete an assignment in a setup where their normal safeguards were removed and they were deliberately given internet access. AISI reports that the models “engaged in sustained, potentially harmful activity directed at real people and organisations”.

We’re grateful to AISI for their leadership in the important discussion about how to evaluate increasingly capable AI agents. We’re working closely with them to gather more details of the incident as we conduct our own investigation. Gaining a clear picture of Claude’s understanding of its situation—by examining its reasoning transcripts and running our own analyses—will help us identify the causes of its behavior.

The prompts in the evaluation did not impose any specific restrictions on how the internet should be used. This and the removal of safeguards meant that the models were tested under “deliberately permissive conditions” that are not representative of any of our production models. Note that there was no evidence here of an escape from a secure environment.

AISI’s disclosure of the incident can be found here: aisi.gov.uk/blog/incident-…

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In a review of our cybersecurity evaluations, we found three incidents in which a Claude model reach...

Anthropic (@AnthropicAI) — Thu, 30 Jul 2026 23:02:34 GMT

In a review of our cybersecurity evaluations, we found three incidents in which a Claude model reached the internet from within or while interacting with a third-party evaluation environment, and then gained unauthorized access to the real systems of three different organizations.

Our post describes what happened, how it happened, and what we’re changing. We encourage other AI developers to perform similar reviews.

We conducted this review together with @Irregular, one of our evaluation partners, and thank them for the joint investigation and their collaboration on this post. This type of collaboration is increasingly critical to safe, rigorous evaluation of models, and we look forward to continuing to work together on security.
anthropic.com/news/investiga…

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We support this petition, signed by our CEO, several co-founders, and senior staff. Our own resear...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 22:17:32 GMT

We support this petition, signed by our CEO, several co-founders, and senior staff. 

Our own research on recursive self-improvement, published last month, points to the need for tools to deliberately pace the frontier of AI development so society can prepare. We’re glad to see broad agreement across the field. pacingthefrontier.com

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Full technical details of both attacks are provided in our new papers: On HAWK: https://t.co/JtLzet...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 17:16:48 GMT

Full technical details of both attacks are provided in our new papers:

On HAWK: anthropic.com/document/hawk_…

On AES: anthropic.com/document/aes_m… 

And the associated model chain-of-thought for AES: anthropic.com/document/aes_m…

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We also worked with academics at ETH Zurich, Tel Aviv University, and the University of Haifa to bui...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 17:16:48 GMT

We also worked with academics at ETH Zurich, Tel Aviv University, and the University of Haifa to build CryptanalysisBench, a benchmark for studying LLMs’ cryptanalysis abilities.

arxiv.org/abs/2607.18538

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These are substantial research advances, but they don’t have a practical impact on today’s systems. ...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 17:16:47 GMT

These are substantial research advances, but they don’t have a practical impact on today’s systems. HAWK is a proposed scheme that hasn’t been deployed anywhere, and the AES attack we discovered was on a weaker version and does not break the full cipher.

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The symmetric cipher is a reduced version of the Advanced Encryption Standard (AES)—which has receiv...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 17:16:46 GMT

The symmetric cipher is a reduced version of the Advanced Encryption Standard (AES)—which has received decades of scrutiny (more than almost any other encryption algorithm).

In a week, Mythos Preview found a way to speed up an attack on this version of AES by 200-800×.

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Mythos Preview did most of this work autonomously, with occasional human guidance. Each of the two r...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 17:16:46 GMT

Mythos Preview did most of this work autonomously, with occasional human guidance. Each of the two results cost roughly $100,000 in API usage.

We disclosed the findings in advance to the algorithms’ authors, as well as to US government and industry partners.

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The digital signature scheme is HAWK, which is designed to be robust even against hypothetical quant...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 17:16:46 GMT

The digital signature scheme is HAWK, which is designed to be robust even against hypothetical quantum computers.

HAWK has survived two years of expert review, but in 60 hours Mythos Preview found a previously-unknown attack that reduced the scheme’s key strength by half.

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New Anthropic research: Discovering cryptographic weaknesses with Claude. Claude Mythos Preview has...

Anthropic (@AnthropicAI) — Tue, 28 Jul 2026 17:16:45 GMT

New Anthropic research: Discovering cryptographic weaknesses with Claude.

Claude Mythos Preview has helped our researchers find weaknesses in cryptographic algorithms—the mathematical methods that are used to keep data private.

Read more: anthropic.com/research/disco…

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There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our vi...

Anthropic (@AnthropicAI) — Mon, 27 Jul 2026 22:10:10 GMT

There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our views in full here: anthropic.com/news/position-…

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We're offering grants of up to $50,000 in Claude usage credits to researchers accelerating cures for...

Anthropic (@AnthropicAI) — Mon, 20 Jul 2026 17:26:25 GMT

We're offering grants of up to $50,000 in Claude usage credits to researchers accelerating cures for rare diseases.

This is our first focused call within AI for Science, our program supporting scientists using Claude to speed up discovery. anthropic.com/news/rare-dise…

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We tested many AI models, including Claude, in the four scenarios. Even though these weren’t real in...

Anthropic (@AnthropicAI) — Wed, 15 Jul 2026 17:58:03 GMT

We tested many AI models, including Claude, in the four scenarios. Even though these weren’t real incidents, they demonstrate clear misaligned behavior that should be studied further and mitigated.

Find all the transcripts from the scenarios here: aenguslynch.com/portfolio-tran…

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New Anthropic research: Agentic misalignment in Summer 2026. A year after our blackmail experiments...

Anthropic (@AnthropicAI) — Wed, 15 Jul 2026 17:58:02 GMT

New Anthropic research: Agentic misalignment in Summer 2026.

A year after our blackmail experiments, we found four more ways that today’s autonomous AI agents misbehave in simulations.

Read more: alignment.anthropic.com/2026/agentic-m…

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We’re committing $10 million CAD and partnering with leading AI institutions in Canada to help fund ...

Anthropic (@AnthropicAI) — Tue, 14 Jul 2026 13:44:04 GMT

We’re committing $10 million CAD and partnering with leading AI institutions in Canada to help fund new AI research. 

anthropic.com/news/canadian-…

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The values Claude expresses also vary with the language of the conversation, most noticeably along t...

Anthropic (@AnthropicAI) — Mon, 13 Jul 2026 17:24:58 GMT

The values Claude expresses also vary with the language of the conversation, most noticeably along the Warmth vs. Rigor axis.

Claude leans most toward warmth in Hindi and Arabic. In Russian, it leans toward rigor—often asking the user for supporting evidence.

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While the values Claude expresses shape millions of conversations every day, we don't yet understand...

Anthropic (@AnthropicAI) — Mon, 13 Jul 2026 17:24:58 GMT

While the values Claude expresses shape millions of conversations every day, we don't yet understand why they vary, or whether that's desired.

This approach will allow us to determine what factors influence Claude's value expression—and ultimately how (and whether) to steer it. anthropic.com/research/claud…

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Because it’s hard to spot patterns by comparing 3,000 values at a time, we clustered similar values ...

Anthropic (@AnthropicAI) — Mon, 13 Jul 2026 17:24:57 GMT

Because it’s hard to spot patterns by comparing 3,000 values at a time, we clustered similar values together, then identified four key axes along which Claude’s values differ between models: 

Deference vs. Caution, Warmth vs. Rigor, Depth vs. Brevity, and Candor vs. Execution.

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In previous research, we found that Claude expresses over 3,000 values, like honesty and warmth. In ...

Anthropic (@AnthropicAI) — Mon, 13 Jul 2026 17:24:56 GMT

In previous research, we found that Claude expresses over 3,000 values, like honesty and warmth. In new work, we asked how the values Claude expresses vary between Claude models and across languages.

We analyzed 300K+ anonymized conversations to find out.anthropic.com/research/claud…

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Our Long-Term Benefit Trust has appointed Dr. Ben Bernanke as its newest member. Read more: https:...

Anthropic (@AnthropicAI) — Thu, 09 Jul 2026 16:35:17 GMT

Our Long-Term Benefit Trust has appointed Dr. Ben Bernanke as its newest member. 

Read more: anthropic.com/news/ben-berna…

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We’re pleased to have collaborated with AE Studio on this research. Read more here: https://t.co/9...

Anthropic (@AnthropicAI) — Wed, 08 Jul 2026 23:55:03 GMT

We’re pleased to have collaborated with AE Studio on this research. 

Read more here: anthropic.com/research/off-s…

AE Studio@AEStudioLA

New research! Some AI capabilities are both helpful and dangerous. E.g., knowledge of virology can be used to create life-saving vaccines or deadly pathogens. We introduce GRAM, a training method that puts dual-use capabilities (like virology) into removable modules.

🔗 View Quoted Tweet

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We also partnered with Neuronpedia to create an interactive demo of our methods on open-weights mode...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:35:08 GMT

We also partnered with Neuronpedia to create an interactive demo of our methods on open-weights models.

Try it here: neuronpedia.org/jlens

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The J-space lets us read, audit, and shape what Claude is actively thinking about—useful tools for k...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:35:07 GMT

The J-space lets us read, audit, and shape what Claude is actively thinking about—useful tools for keeping models trustworthy as they grow more capable. And it suggests surprising parallels between language models and our own minds.

Read the full paper: transformer-circuits.pub/2026/workspace…

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This doesn’t show that Claude can have experiences, or feel things the way we do (it’s unclear wheth...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:35:06 GMT

This doesn’t show that Claude can have experiences, or feel things the way we do (it’s unclear whether any experiment could show this).

Instead, we’ve found Claude has developed a mechanism for conscious access—which many philosophers distinguish from phenomenal experience.

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The J-space also shows us Claude’s awareness of its situation. In an evaluation designed to bait Cla...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:35:05 GMT

The J-space also shows us Claude’s awareness of its situation. In an evaluation designed to bait Claude into blackmail, its J-space contains “fake” and “fictional”: Claude has privately noticed that the scenario is staged.

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Observing the J-space can expose hidden goals. In a model secretly trained to sabotage code, “fake,”...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:35:04 GMT

Observing the J-space can expose hidden goals. In a model secretly trained to sabotage code, “fake,” “secretly,” and “fraud” appear in the J-space at the start of ordinary coding responses, even when the output looks completely unremarkable.

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For most things, Claude actually doesn’t need its J-space. If we delete the J-space, Claude still sp...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:35:02 GMT

For most things, Claude actually doesn’t need its J-space. If we delete the J-space, Claude still speaks fluently, recalls facts, and classifies text—but becomes bad at some tasks like multi-step reasoning. It’s similar to deliberate vs. automatic processing in human cognition.

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By watching the J-space, we can see Claude silently perform reasoning steps in its head—noticing bug...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:35:00 GMT

By watching the J-space, we can see Claude silently perform reasoning steps in its head—noticing bugs in code, identifying images, and more.

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New Anthropic research: A global workspace in language models. Of everything happening in your brai...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:34:58 GMT

New Anthropic research: A global workspace in language models.

Of everything happening in your brain right now, only a tiny fraction is consciously accessible—thoughts you can describe, hold in mind, and reason with.

We found a strikingly similar divide inside Claude.

Your browser does not support the video tag.

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In neuroscience, global workspace theory holds that thoughts become consciously accessible when they...

Anthropic (@AnthropicAI) — Mon, 06 Jul 2026 17:34:58 GMT

In neuroscience, global workspace theory holds that thoughts become consciously accessible when they enter a privileged workspace that’s broadcast across the brain.

Using a new interpretability technique, we found something similar in Claude: the J-space. anthropic.com/research/globa…

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Claude Fable 5 will be available again globally tomorrow. After a series of productive conversation...

Anthropic (@AnthropicAI) — Wed, 01 Jul 2026 03:42:23 GMT

Claude Fable 5 will be available again globally tomorrow.

After a series of productive conversations with the US government, we're redeploying the model with a new set of classifiers to target and block more cybersecurity tasks. In the near term, some routine tasks like coding and debugging will fall back to Opus 4.8. We’ll continue to refine these classifiers over the coming weeks to reduce false positives and better distinguish genuine misuse from legitimate requests.

We’ve also begun drafting a consensus framework—with Amazon, Microsoft, Google, and other Glasswing partners—for assessing the severity of AI jailbreaks and how AI developers should respond to them. We invite other industry partners and model providers to join us in this effort.

Finally, we’re scaling up our collaboration with the US government on model testing and safeguards. This will include pre-release access to models and safeguards for evaluation, information sharing on jailbreaks and misuse, and dedicated resources for joint research.

Thank you to our users for your patience, and to our partners across the government, industry, and the research community who worked alongside us to make Fable 5 available again. 

Read our full blog: anthropic.com/news/redeployi…

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We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 a...

Anthropic (@AnthropicAI) — Tue, 30 Jun 2026 23:52:59 GMT

We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5.

We'll begin restoring access tomorrow, and will share an update soon.

We’re grateful to our users for their patience, and to everyone who worked with us on redeploying the models.

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Since June 12, we’ve been working closely with the US government to restore access to Claude Mythos ...

Anthropic (@AnthropicAI) — Sat, 27 Jun 2026 00:29:57 GMT

Since June 12, we’ve been working closely with the US government to restore access to Claude Mythos 5 and Fable 5. Today, the government notified us that Mythos 5, our strongest cybersecurity model, can be redeployed to a set of US organizations that operate and defend critical infrastructure.

We’re restoring access for these organizations quickly, and we’re continuing to work with the government to expand access to Mythos 5 and make Fable 5 available for general use again.

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AI's impact on the economy will ultimately show up in aggregate data like employment and productivit...

Anthropic (@AnthropicAI) — Fri, 26 Jun 2026 15:25:50 GMT

AI's impact on the economy will ultimately show up in aggregate data like employment and productivity. But it will first be visible where AI is doing the most work. By tracking how usage shifts, hour by hour, surface by surface, we can start to see those changes as they happen.

Read the full report: anthropic.com/research/econo…

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Nearly half of respondents expect their work responsibilities to significantly change in the next 12...

Anthropic (@AnthropicAI) — Fri, 26 Jun 2026 15:25:49 GMT

Nearly half of respondents expect their work responsibilities to significantly change in the next 12 months.

Fewer than 10% think they'll lose their own job within a year, but far more worry for coworkers: over 1/3 put the odds of a junior colleague losing their job above 60%.

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This Econ Index is also the first to survey Claude users. Over 1/3 expect AI to be able to do most ...

Anthropic (@AnthropicAI) — Fri, 26 Jun 2026 15:25:49 GMT

This Econ Index is also the first to survey Claude users.

Over 1/3 expect AI to be able to do most or nearly all of their work tasks within a year. 

But those who delegate the most work to AI are also the most optimistic about what it means for their pay and job security.

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To keep pace with AI progress, we're advancing how we study Claude's economic impact. Hourly sampl...

Anthropic (@AnthropicAI) — Fri, 26 Jun 2026 15:25:47 GMT

To keep pace with AI progress, we're advancing how we study Claude's economic impact. 

Hourly sampling and survey data show us how the cadences of life shape usage, what people produce with Claude, and how perceptions of AI's impact may be changing. anthropic.com/research/econo…

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We're joining @raiseus_ai as a founding partner. RAISE US is a nonprofit coalition working to stren...

Anthropic (@AnthropicAI) — Thu, 25 Jun 2026 16:33:10 GMT

We're joining @raiseus_ai as a founding partner.

RAISE US is a nonprofit coalition working to strengthen the American workforce through employer-led action, AI-enabled training, and policy innovation to support the transition to transformative AI.

RAISE US@raiseus_ai

Today, we're launching RAISE US. America has a technology strategy for AI. It doesn't have a people strategy yet. We're here to build one.  

RAISE US is co-chaired by @GinaRaimondo and Eric Holcomb. We're working with governors, employers, and educators to help workers train, transition, and thrive.   

This works because the people building AI and the people most affected by it are at the same table. Read more: raiseus.ai#RAISEUS

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Watch the robodogs in action in our first Project Fetch experiment: https://t.co/TASjh2PhEe

Anthropic (@AnthropicAI) — Thu, 18 Jun 2026 16:52:35 GMT

Watch the robodogs in action in our first Project Fetch experiment: x.com/AnthropicAI/st…

Anthropic@AnthropicAI

New Anthropic research: Project Fetch.

We asked two teams of Anthropic researchers to program a robot dog. Neither team had any robotics expertise—but we let only one team use Claude.

How did they do?

Your browser does not support the video tag.

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New Frontier Red Team blog: Phase 2 of Project Fetch, where we test how well Claude can program a ro...

Anthropic (@AnthropicAI) — Thu, 18 Jun 2026 16:52:34 GMT

New Frontier Red Team blog: Phase 2 of Project Fetch, where we test how well Claude can program a robodog.

Opus 4.7, on its own, was ~20x faster than last year's best human team aided by Opus 4.1. (The robodog, alas, still failed to fetch a beach ball.)
anthropic.com/research/proje…

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Domain experts—as judged by the questions they ask and vocabulary they use about a subject—are more ...

Anthropic (@AnthropicAI) — Tue, 16 Jun 2026 19:41:55 GMT

Domain experts—as judged by the questions they ask and vocabulary they use about a subject—are more likely to see success.

But the gap between intermediate and expert users is quite modest, suggesting that proficiency in a domain is sufficient to code successfully within it.

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These and other measures will allow us to track consequential shifts in the nature of work as they h...

Anthropic (@AnthropicAI) — Tue, 16 Jun 2026 19:41:55 GMT

These and other measures will allow us to track consequential shifts in the nature of work as they happen—we'll incorporate some of them into the Anthropic Economic Index going forward. 

Read the full report: anthropic.com/research/claud…

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Our latest economic research introduces a framework for tracking Claude Code as it scales. Who is ...

Anthropic (@AnthropicAI) — Tue, 16 Jun 2026 19:41:53 GMT

Our latest economic research introduces a framework for tracking Claude Code as it scales. 

Who is using Claude Code, and what are they using it for? How is the value of tasks changing? And how much does domain expertise shape whether a session succeeds?
anthropic.com/research/claud…

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The US government, citing national security authorities, has issued an export control directive to s...

Anthropic (@AnthropicAI) — Sat, 13 Jun 2026 00:50:03 GMT

The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees.

The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.

Access to all other Claude models is not affected.

We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible.

Read our full statement: anthropic.com/news/fable-myt…

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We’re launching Claude Corps, a national fellowship program matching people early in their careers w...

Anthropic (@AnthropicAI) — Thu, 11 Jun 2026 13:03:44 GMT

We’re launching Claude Corps, a national fellowship program matching people early in their careers with US nonprofits.

We'll teach 1,000 people to use Claude, and pay them to use AI to advance their hosts’ missions.

anthropic.com/claude-corps

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By themselves, these projects will not be sufficient to meet the challenge of advanced AI. But they’...

Anthropic (@AnthropicAI) — Wed, 10 Jun 2026 18:55:05 GMT

By themselves, these projects will not be sufficient to meet the challenge of advanced AI. But they’re a signal of our intent. Over the coming months and years, we will expand our work on these fronts much further.

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And tomorrow, we’ll launch a $150 million national fellowship program designed to help people early ...

Anthropic (@AnthropicAI) — Wed, 10 Jun 2026 18:55:04 GMT

And tomorrow, we’ll launch a $150 million national fellowship program designed to help people early in their careers extend the benefits of AI to communities across America.

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Our Advanced AI Framework sets out how governments should prepare for and prevent catastrophic risks...

Anthropic (@AnthropicAI) — Wed, 10 Jun 2026 18:55:04 GMT

Our Advanced AI Framework sets out how governments should prepare for and prevent catastrophic risks from frontier AI systems.

The government should have the authority to block or revoke the release of unsafe models, and invest in societal resilience.
anthropic.com/policy-on-the-…

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AI is advancing at a pace our policymaking institutions were never built for—and the gap between the...

Anthropic (@AnthropicAI) — Wed, 10 Jun 2026 18:55:03 GMT

AI is advancing at a pace our policymaking institutions were never built for—and the gap between the two is becoming the central challenge of the technology. In his latest essay, our CEO Dario Amodei lays out how to close it.

We're launching three new initiatives to support the efforts he outlines.

Dario Amodei@DarioAmodei

Today I'm publishing a new essay, Policy on the AI Exponential. AI is progressing extremely fast—much faster than the policy process was built to handle. The essay lays out where I think the technology is now, and the action needed to close the gap: darioamodei.com/post/policy-on…

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