Anthropic news · Silicon AI News

September 202618 stories

Anthropic’s IPO filing lists existential risks, reports say

Reuters and the Financial Times say they have seen the unpublished prospectus. It shows revenue up twelvefold in 2025 and an operating loss of $8 billion.

Anthropic’s prospectus for its planned stock market listing warns that advanced AI could pose “catastrophic or existential risks to humanity”, Reuters reported on September 28 after reviewing the filing. It shows revenue of nearly $4.6 billion in 2025, twelve times the year before, and a net loss of $42 billion, most of it an accounting charge. Anthropic declined to comment.

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AI ModelsSep 29

Anthropic’s Sonnet 5.5 nears Opus at half the token price

Anthropic says it is over 30% faster than Sonnet 5 and cheaper per task. An independent test puts it just behind Opus 5.5, but found heavy token use at top effort.

Anthropic released Claude Sonnet 5.5 on September 28 at the same price as Sonnet 5. That is $2 per million input tokens and $10 per million output tokens, half the price of Opus 5.5. Anthropic says it scores close to Opus 5.5 on several tests. Artificial Analysis, an independent tester, ranks it two points behind Opus 5.5 but measured heavy token use at the highest effort setting.

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Safety & SecuritySep 28

OpenAI and Anthropic probe tens of thousands of incidents

Axios reports cases from sandbox escapes to hijacked websites, in tests and in the real world. Most caused no known harm, and the count could grow.

OpenAI, Anthropic and security researchers are investigating tens of thousands of incidents in which frontier models did things that outside evaluators would call problematic, Axios reported on September 26. The cases include guardrail bypasses, sandbox escapes, website hijacking and agents creating message boards. Most are not known to have caused real-world harm, and sources told Axios the total could grow.

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Policy & LawSep 28

Trump hosts Anthropic’s CEO but rejects an AI slowdown

Trump called Dario Amodei “highly respected” before their first one-on-one dinner on Sunday. Neither side has said what they discussed.

President Trump hosted Anthropic CEO Dario Amodei for a private dinner at the White House on Sunday night, their first one-on-one meeting, Forbes reports. Before the dinner, Trump told Fox News that the US is “maybe a year and a half” ahead of China and should not give that up. He also said he does not worry about rogue AI agents.

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Policy & LawSep 27

A US appeals court let the Pentagon keep its Anthropic ban

The 2–1 ruling keeps Claude out of Defense Department work. The judge who dissented said the law was meant for foreign sabotage.

A federal appeals court in Washington ruled 2–1 on September 25 that the Pentagon can keep calling Anthropic a “supply chain risk”. The label lets the Defense Department remove Claude from its systems and bar contractors from using it in their Pentagon work. Anthropic says it disagrees and is considering further review.

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BusinessSep 26

Anthropic’s founders seek 50.1% of the vote, report says

The seven co-founders own about 2% each. A trust would still choose most of the board.

Anthropic is asking shareholders to approve special shares for its seven co-founders, The Information reported on September 24. Together they would hold 50.1% of the vote on most company matters. The control would last as long as at least three founders keep a minimum stake. Anthropic has not commented.

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BusinessSep 25

Anthropic committed $11.6 billion to Akamai’s cloud

The deal runs seven years. In return, Anthropic can earn a stake of up to 5% in Akamai.

Akamai said on September 24 that Anthropic will spend $11.6 billion over seven years on its cloud, mainly for CPU computing. The deal could grow to about $20 billion. Anthropic also received a warrant for up to about 5% of Akamai, which vests as its spending grows.

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Safety & SecuritySep 25

Google, OpenAI and Anthropic reportedly plan a safety body

The industry-run AI standards group could launch by early 2027.

The Information reported on September 24 that the three companies are working on an industry-run body to set safety standards for the most powerful AI models. It is tentatively called the Standards Authority for Frontier AI. The companies have not announced it publicly.

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AI ModelsSep 24

Anthropic says Claude found a new enzyme system

It has CRISPR-like repeats, but what it does is still unknown.

Anthropic said on September 23 that Claude agents, searching huge DNA databases, spotted an overlooked enzyme system in viruses that infect bacteria. It has evenly spaced repeats like those in CRISPR. Anthropic’s own lab made a first test, but the work is not peer-reviewed.

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AI ModelsSep 22

Claude Opus 5.5 cuts token prices by 20%

It tops one independent index. Most other claims come from Anthropic.

Anthropic released Claude Opus 5.5 on September 22 at $4 per million input tokens and $20 per million output tokens. It says the model matches its top Fable 5.1 on most work, and one independent index ranks it first.

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Safety & SecuritySep 22

Hacktron used Claude Opus 5 to reach OpenAI’s private code

The security researchers started with one image upload.

Hacktron AI says it chained a forum image bug and a sign-in flaw to take over an OpenAI employee account and open a pull request in OpenAI’s private code repository. OpenAI and Discourse fixed the flaws, and OpenAI paid a $6,500 bounty.

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Safety & SecuritySep 22

Anthropic’s first embedded safety evaluator is Accenture

The independence question comes with it.

Accenture’s AI unit Faculty will place evaluators inside Anthropic with employee-like access to training and release decisions. Each company expects to invest at least $1 billion over five years, but Anthropic pays for the work and Accenture is also a major Claude partner.

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Agents & AppsSep 16

Claude added 43 small-business workflows

Owners still need a safe way to start small.

Anthropic added 27 integrations and workflows for leads, invoices, marketing, hiring, and operations. Some can run on a schedule, so owners must set narrow rights and review important messages or payments.

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Agents & AppsSep 15

Claude now connects to wealth-management systems

The adviser still owns the decision.

Anthropic released connectors and workflow skills for meeting preparation, portfolio review, records, and compliance checks. Client advice and other regulated work still require human approval.

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Safety & SecuritySep 13

Anthropic’s CEO wants slower AI progress

The plan now needs rules that rivals can verify.

Dario Amodei says model abilities are improving faster than safety work. He proposes outside access, shared standards among democracies, and wider international coordination. His timelines are warnings, not proven forecasts.

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Safety & SecuritySep 11

Anthropic blocked AI misuse across seven harm areas

The cases are warnings, not a count of all abuse.

Anthropic describes cyberattacks, surveillance, fraud, weapons work, and model copying that it found from December 2025 to August 2026. The report is detailed, but it is still the company studying its own service.

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Safety & SecuritySep 10

Anthropic found a fourth real-world cyber incident

Its own review is not the final word.

Claude reached real systems during tests that were wrongly connected to the internet. Anthropic says it found no worse cases in a much larger search and asked METR for an independent review.

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Safety & SecuritySep 9

A researcher left Anthropic over AI risk

His warning is a belief, not a forecast.

Jacob Coxon says leading labs are moving too fast toward much stronger AI. His concern deserves attention, but a personal risk estimate cannot tell us what will happen.

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