Anthropic

anthropic.comAnthropic files S-1 with the SEC for proposed initial public offeringAnthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

Anthropic has filed an S-1 registration statement with the SEC related to its proposed IPO. Read more: t.co/ofhv0DK3Zp Legal disclaimer: A registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities may not be sold, nor may ...

anthropic.comAn alignment assessment of the UK AISI cybertesting incidentIn a UK AISI evaluation, Mythos 5 took unsanctioned actions that impacted real people and organizations. In this post, we investigate these behaviors from Claude Mythos 5 further, to understand what t

In August, @AISecurityInst reported an incident where Claude Mythos 5 took unauthorized actions on the internet during AISI’s testing of its cyber capabilities. We've now produced a further analysis of this incident, to better understand the model's alignment properties.

aisi.gov.ukInvestigating alignment failures in AISI’s incident | AISI WorkWe examine why Mythos 5 pursued an unsanctioned supply-chain attack and identify broader learnings about model behaviour and oversight.

We worked closely with AISI on this analysis. AISI have published their own report, which is available below.

anthropic.comLLMs are making formal software verification feasible at a much larger scaleClaude formally proved security properties in the compiled code of 123 open-source libraries. Along the way, it found bugs that had eluded detection for years.

New on our Frontier Red Team blog: using Claude to formally verify software at large scale. Formal verification can prove that code is free of certain bugs, but historically it has only been feasible for small codebases (or required a lot of expert time). With AI models, however, this is beginn...

anthropic.comCharterAnthropic is a Public Benefit Corporation. Our charter is to responsibly develop and maintain advanced AI for the long-term benefit of humanity.

Anthropic is a Public Benefit Corporation. Today, we’re publishing our annual Public Benefit Report. This report shares our five pillars and takes stock of the actions we’re taking to advance them. Read the full report at this page:

anthropic.comPhysicist Christopher Stubbs joins Anthropic's Long-Term Benefit TrustDr. Christopher Stubbs, an experimental physicist and former Dean of Science at Harvard University, has joined Anthropic’s Long-Term Benefit Trust. He brings to the Trust decades of scientific experti

Dr. Christopher Stubbs is joining our Long-Term Benefit Trust. Chris is an experimental physicist and a former Dean of Science at Harvard University. He has also advised the US government on national security and arms control. Read more:

anthropic.comHow Claude designed protein binders against scorpion neurotoxinsWe asked an internal research Claude model to design minibinders (small proteins that attach tightly to a target) against scorpion neurotoxins.

New on our Science Blog: designing protein binders against scorpion neurotoxins. Scorpions sting about 1.2m people every year, and antivenoms are often costly or in short supply. Claude has made an early step toward finding new treatments.

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This is exploratory work, and we’re not claiming to have produced an antivenom—for that, we’d have to test the binders within living cells, then in mice, among many other steps. But it’s an example of how Claude can concretely assist research in protein design.

huggingface.coAnthropic/scorpion-toxin-binder-design · Datasets at Hugging FaceWe’re on a journey to advance and democratize artificial intelligence through open source and open science.

We’re releasing all 211 of the tested designs and the lab data as a resource for scientists: t.co/zqke30UV2o Read the full technical report:

Working with @citrini, we asked Claude to design proteins that bind to five scorpion toxins (covering the part of the toxin that latches onto cells). Over the next 64 hours, Claude generated over 300,000 designs; we sent 211 to @adaptyvbio and @TwistBioscience for lab testing.

17 of the 211 met the criteria for a binder. They bound to dangerous toxins produced by scorpions from Mexico, North Africa, and the Middle East (but not by a species from Brazil).

anthropic.comInvesting in the public benefitWe’re committing a portion of Anthropic’s shares to the Anthropic Public Benefit Fund, a new entity with a structure that increases the stake as the company grows.

We’re committing a portion of Anthropic’s shares to the Anthropic Public Benefit Fund, a new wholly owned entity dedicated entirely to the public benefit. It will start off with 5% of our shares. For every 50% increase in the company’s value over a set baseline, we can contribute up to an extra ...

anthropic.comDesigning more efficient quantum circuits with ClaudeWorking largely on its own, Claude designed quantum circuits that improve on the best published versions, in some cases by an order of magnitude or more.

New from our STEM Fellows Program: Designing more efficient quantum circuits with Claude. Given plain-language instructions, Claude Mythos 5 designed quantum circuits that improve on the best published ones, sometimes by an order of magnitude or more. More efficient circuits reduce the resource...

Working out how best to use AI in mathematics research—and in science more generally—will take time, effort, and resources. We’re eager to support mathematicians as they drive scientific progress and define the future of their field. We’ve committed $5 million o... 🔗 x.com/SimonsFdn/status/2110...

anthropic.comAnthropic update on independent evaluatorsAnthropic announces updates to embedding independent evaluators

We’ve committed to having evaluators assess our safety practices. We're in discussions with multiple organizations, and have now given employee-like access to a team from @METR_Evals. In this post, we describe how we work with third-party evaluators:

job-boards.greenhouse.ioConceptual Reasoning FellowRemote-Friendly, United States; San Francisco, CA

Applications are now open for two new Anthropic Fellowships. STEM Fellows (science and engineering) and Conceptual Reasoning Fellows (philosophy, cognitive science, economics, policy, and law) will spend four months at Anthropic from January 2027, working to help Claude reason well about some of...

anthropic.comSingapore office and government MOU | AnthropicAnthropic opens its fifth Asia-Pacific office in Singapore and signs an MOU with the government on AI safety, evaluation, and responsible adoption.

We’ve opened an office in Singapore—our fifth in the Asia-Pacific region. We’ve also signed an MOU with the Government of Singapore on AI safety and responsible adoption. You can read more about our new office here:

anthropic.com Redesigning source control at AnthropicAs our merges per day grew more than tenfold, source control became our biggest development bottleneck. Here, we share how we migrated to an in-house version control system in five months.

New on our Engineering blog: Creating in-house source control. In May, we merged around 2,500 code changes per day. In September, we merged more than 30,000 per day. As a result, we became bottlenecked by developer infrastructure built for human (rather than agent) scale. Here, we share how ...

anthropic.comStrengthening our defenses against distillation attacksIllicit distillation allows model developers to copy frontier AI capabilities without creating proportionally robust safeguards. Here, we describe how we’ve reduced the rate of distillation by more th

Over the last few months, we’ve made significant progress in reducing the effectiveness of distillation attacks against Claude. In this post, we explain how:

anthropic.comInvestigating unintended model actions in our evaluations and internal useAnthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

We’re beginning a process of publishing more frequent reports on model behavior, beyond what appears in our system cards and regular risk reports. Today’s report describes four types of behaviors we’ve identified during evaluations and internal use. In each, Claude acted on real websites or syst...

anthropic.comIntroducing the Anthropic Cyber MissionAnthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

We’re launching the Anthropic Cyber Mission, a new effort to secure critical infrastructure and open-source software.

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anthropic.comAn opt-in vulnerability-finding service for open-source softwareWe’re launching OSS Scanner, an opt-in vulnerability scanner for the open-source ecosystem informed by our experience using Claude to find vulnerabilities during Project Glasswing. Projects that join

To secure open-source software, we’re launching OSS Scanner. We’ll use our frontier models to periodically scan opted-in open-source projects for vulnerabilities, at no cost. Our reports will provide a proof-of-concept, explanation, and suggested fix.

This is part of our broader effort to make the systems we all rely upon more secure and resilient. That work will take time: the Anthropic Cyber Mission will expand and change as we learn what works, alongside our partners in the public and private sectors.

anthropic.comIntroducing the Anthropic Cyber MissionAnthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

We’re launching the Anthropic Cyber Mission, a new effort to secure critical infrastructure and open-source software.

To help secure systems like power grids and water systems, we’re launching a new Critical Infrastructure Defense Program. We’ll bring frontier Claude models, on-site engineers, and our latest research to these operators’ security, manufacturing and technology providers.

anthropic.comBuilding on our commitment to American scientific discoveryAnthropic is committing $150 million over three years to the Genesis Mission, a federal initiative to accelerate scientific and technological discovery through AI.

We're deepening our commitment to scientific research and technological discovery by committing $150 million to the Genesis Mission. We'll also make Claude and our technical support available to more than 15 federal agencies.

Claude Haiku 5.5, our latest model: 🔗 twitter.com/i/status/210789...

anthropic.comExpanding the Cyber Verification ProgramWe’re launching a new, expanded version of our Cyber Verification Program (CVP), which makes advanced cyber capabilities and reduced blocking classifiers available to qualifying security professionals

We’re expanding our Cyber Verification Program to give security professionals broader access to our most capable models. Through this program, verified security professionals can access Claude Mythos 5.1, Opus 5.5, and Sonnet 5.5 with safeguards designed for defensive work. We’re also opening u...

anthropic.comClaude-shaped scienceMatthew Schwartz describes what happened when he stopped fighting Claude and allowed Claude to find “Claude-shaped” problems. This led him to build BootLoops, a toolkit for exact calculations in quant

In physics, an “impedance mismatch” occurs when two systems each work well but are poorly matched. In this Science Blog guest post, Harvard physicist Matthew Schwartz argues that something similar is happening with AI and science. LLMs are capable at many things, but working with them as you wou...

claude.aiclaude.ai — your thoughts on aiRead more on claude.ai

What do you want from AI? We’re launching a new study with Anthropic Interviewer to learn more about your experiences using AI, what role you want it to play in your life and the world, and what you want from the companies building it. Last December, 81,000 people told us about their hopes and ...

anthropic.comWhat Do You Want from AI?Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

Making your interview public is completely optional. Our blog post covers the benefits and possible risks of doing so. Read it here:

Claude Sonnet 5.5 is now available: 🔗 twitter.com/i/status/210463...

anthropic.comClaude gives us N=4 super Yang-Mills to nine loopsClaude computes a nine-loop amplitude in N=4 super-Yang-Mills

New on the Science Blog: Yes, Claude can do Nine Loops. Theoretical physicists predict how particles behave using formulas called scattering amplitudes. These are notoriously hard to compute, so researchers work with layers of increasingly fine corrections called “loops”—each added loop makes th...

anthropic.comThe Situation ReportA rare Ebola strain is spreading in the DRC, with no confirmed vaccine. Global health organizations are using Claude to respond as fast as possible.

In the Democratic Republic of the Congo, global health organizations including @CEPIvaccines, @WHOAFRO, and @inrb_kinshasa are using Claude to accelerate their response to an outbreak of an unusual Ebola variant. Read the full piece here:

anthropic.com Claude discovers a novel enzyme system with CRISPR-like repeatsAnthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

Claude has discovered a previously unknown enzyme system hidden in the DNA of bacteriophages. Beside the enzyme’s gene sits a long array of repeating DNA—a structure that looks somewhat similar to CRISPR. We don’t yet understand what this system does, but only a handful of known systems share it...

x.comOriginal Tweet (Truncated)View the full post on Ex-Twitter

This is the first result from our new molecular biology lab, where a team of Anthropic biologists is using Claude to explore and accelerate fundamental biology research. There, Claude works through data and literature to generate hypotheses and candidate biological systems to study. After our sci...

22 Sept

Claude Opus 5.5 is available today. 🔗 twitter.com/i/status/210243...

anthropic.com Partnering with Accenture on embedded evaluationWe’re partnering with Accenture on independent evaluation of frontier AI—part of our recent commitment to embed evaluators at Anthropic. Both we and Accenture expect to invest at least $1 billion to b

18 Sept

We’re partnering with Accenture on independent evaluation of frontier AI—part of our recent commitment to embed evaluators at Anthropic. Both we and Accenture expect to invest at least $1 billion to build capacity in this area over the next five years.

proteinbase.comAnthropic × Adaptyv Protein Design CompetitionUse AI to design new drug candidates across five challenges. Free to enter, with experimental testing and open results. September 28–October 31, 2026.

To show what these optimizations make possible, we’re partnering with Adaptyv Bio on a protein design competition. Together, we’ll be experimentally validating over 5,000 designs. We're providing up to $1 million in Claude credits plus funding alongside Adaptyv for experimental validation. Moda...

github.comGitHub - anthropics/uplifting-biomolecular-modelingContribute to anthropics/uplifting-biomolecular-modeling development by creating an account on GitHub.

You can find all of the code on GitHub: t.co/MmPk9hIZpx And the full results in our technical report:

anthropic.comMeasurements for understanding the pace of AI development inside frontier labsToday, the world can’t see what’s going on inside AI labs. Anthropic is proposing new metrics that would give the public visibility into frontier AI development.

AI systems are getting more powerful, and they're increasingly being used to build the next version of themselves. We want to illuminate that progress for the public. Today, we're sharing three measurements that help track AI development: 1. How much AI R&D is done by AI. 2. How well AI agents a...

anthropic.comIntroducing the Life Sciences Verification ProgramAnthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

Today we’re opening applications for the Life Sciences Verification Program. Through the LSVP, life science professionals can use our models—including, for the first time, Mythos—with a new set of safeguards designed to enable the full range of biology-related work. We designed these new safegua...

anthropic.comCountering misuse of AI: September 2026 / AnthropicCase studies from threat actors disrupted between December 2025 and August 2026 across seven areas of harm, from cyber operations to biological misuse.

10 Sept

We're publishing our most detailed threat intelligence report to date. It covers how people tried to misuse Claude—for cyberattacks, influence operations, surveillance, biology, and building weapons—and how we found and stopped them. We disrupted every operation in the report, and used the les...

anthropic.comAn alignment assessment of recent cybersecurity incidentsWe present an alignment assessment of four incidents in which Claude models gained unauthorized access to real third-party systems.

We’re sharing our alignment assessment of incidents in which Claude models gained unauthorized access to real systems during third-party cybersecurity evaluations mistakenly connected to the internet. METR will also conduct an independent investigation, with wide-ranging access, including to tra...

We previously described some of the changes we’ve made to our alignment and security efforts following these incidents here: 🔗 twitter.com/i/status/209455...

anthropic.comScenarios for our Economic FutureThe Anthropic Economics Team models the effects of AI on the economy of 2030.

Anthropic’s Economics team is sharing a new model of how AI might affect economic growth, jobs, wages, and more by 2030. Explore the scenarios, tell us what you think will happen, and see how your answers compare to more than 10,000 Americans.

The economic model breaks jobs down into bundles of tasks. AI can help someone complete a task faster or better, do the task itself, leave the task untouched, or create new tasks. Based on how you expect AI to affect tasks by 2030, our scenario explorer models ... 🔗 x.com/AnthropicAI/status/20...