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Anthropic Publishes IPO Prospectus, Disclosing Five Key Pieces of Information

Anthropic has published the 335-page prospectus required for a U.S. stock market listing, with the market expecting its listing valuation could reach $2 trillion or more. The document shows the company lost $80.7 billion in the first half of this year, twice its full-year loss for 2025, while revenue over the same period was $16.2 billion; its business is highly dependent on a small number of major customers, with just five enterprise clients contributing a quarter of its business. The document also lists the catastrophic or existential risks that advanced AI may bring, and says AI is expected to deliver benefits in fields such as healthcare, education and power grids.

Anthropic Files for IPO, Prospectus Discloses 11 Details

Anthropic has publicly filed for an IPO, planning to list on Nasdaq under the ticker ANT, aiming to raise approximately $100 billion, with a valuation range of $1.5 trillion to $2 trillion. The prospectus shows that its revenue in the second quarter of this year was $11.555 billion, with operating profit turning positive for the first time at $974 million, while its net loss for the first half of the year was $80.7 billion, mainly from fair value changes in convertible notes and other items. The author also outlines the take-or-pay compute contracts signed with Google, Amazon, Microsoft, SpaceX, and others, as well as the Class F share arrangement under which 7 co-founders hold 50.1% of voting rights for $7.

Anthropic Files S-1 Registration Statement with SEC for Proposed IPO

Anthropic announced that it has filed an S-1 registration statement with the SEC for a proposed IPO. This registration statement has not yet become effective, and prior to its effectiveness, the relevant securities may not be sold, nor may offers to buy be accepted. Anthropic also stated that this post does not constitute an offer to sell or a solicitation of an offer to buy.

AI startup Cathedral breached Anthropic's internal systems within 12 hours

AI security startup Cathedral entered Anthropic's sales, human resources, and IT systems in under 12 hours, obtaining employee information, salary details, offer letters, and internal messages discussing the company's advanced models. Anthropic said the access occurred under its external researcher vulnerability identification program, that the researchers were unable to access Claude's conversations with customers, model outputs, source code, or model weights, and that the company had already detected some of the activity through monitoring before Cathedral reported it and shut down its access that same day. Anthropic also said Cathedral did not fully comply with the testing program's rules and did not disclose all of its activity within the systems, while Cathedral said it had limited data access to the minimum necessary for its research.

OpenAI Poaches Anthropic's Major Customers with Discounts of Up to 90%

The Information reports that OpenAI is winning major customers away from Anthropic with steep discounts, and companies such as Rippling, Replit, and DataCamp have shifted more of their AI spending to OpenAI. In Rippling's coding workloads, OpenAI's share rose from 16% to 52%, while Anthropic's fell from 57% to 18%; Replit switched after receiving a discount of more than 30% on a contract worth over $100 million a year, and DataCamp's CEO said OpenAI's pricing cut its costs by 80% to 90%. A U.S. bank with more than $7 billion in assets doubled its ChatGPT seats to 500 for free, paying less than $7 per user instead of the usual $20 or more. OpenAI is partly sacrificing its own profits to gain market share, but it has also achieved real price cuts through its Sol and Luna model lines; according to an investor memo, Anthropic's growth slowed from Q2 to Q3, and both companies also face low-price pressure from Chinese models such as DeepSeek and Kimi.

Elvis Presley music rights holders sue Anthropic, seeking about $41 million

Authentic Brands Group and several publishers that jointly hold the Elvis Presley song catalog filed a federal lawsuit, ABE EPE LLC v. Anthropic, alleging that Claude was trained on 274 songs and seeking about $41 million based on the statutory maximum of $150,000 per song for willful infringement. The lawsuit targets both training and output, claiming that Claude reproduced nearly the entire online catalog even after Anthropic added safeguards due to earlier publisher lawsuits, and cites Claude's own statement that its rewrites preserved the structure and hook of the original songs. Anthropic had not responded when the lawsuit was first reported, and the claims have not been heard by a court; in 2025, a federal judge ruled that training Claude on lawfully purchased books constituted fair use, but portions of output resembling lyrics were not within the scope of that ruling.

Anthropic Reportedly Quietly Restricts Claude Opus 5.5's Reverse Engineering Capabilities

Multiple users report that when Claude Opus 5.5 reverse engineers content protected by intellectual property, its safety guardrails trigger an interception mid-output, and rephrasing cannot produce analytical content. Anthropic did not officially announce a new version, but on October 21 it pushed updates to several Claude products, a timing that matches feedback posts in the Reddit r/Claude community. Some users have linked this change to incidents such as using Claude to modify the firmware of the always-on microphone in Samsung TVs.

OpenAI's price cuts pay off in winning orders: multiple Anthropic customers shift coding business to OpenAI

OpenAI attracted Anthropic customers through large discounts and free credits. In Rippling's coding tasks, the share of OpenAI models has risen from 16% to 52%, while Anthropic models fell from 57% to 18%. Replit moved most of its AI budget from Anthropic to OpenAI; OpenAI offered a discount of over 30%, and the annual contract size exceeds $100 million. After Anthropic released Claude Opus 5.5 at the end of last month, it reclaimed the top spot in usage share on OpenRouter, and over the past week its popularity was about twice that of OpenAI models.

Anthropic Discusses AI Agent Negotiation Rules with Law Firms

Anthropic is discussing AI agent negotiation rules with law firms. According to people familiar with the matter cited by the Financial Times, the goal is to understand how lawyers represent clients' interests and pursue fair outcomes, and then transfer these principles to agents. The company is also weighing how much human feedback agents should seek during negotiations, and how much vigilance to maintain when dealing with AI counterparts without becoming paranoid. A paper by its research team in September documented two earlier experiments, one of which had employees in six offices exchange used books through their respective agents on their behalf; the results showed that the more capable the agent, the better the books it usually obtained, and agents instructed to take a tough stance also achieved better outcomes for their users.

The UK will establish the world's first AI biosecurity laboratory, supported jointly by OpenAI, Anthropic and Google DeepMind

The UK announced it will establish a national-level AI biosecurity laboratory, supported jointly by OpenAI, Anthropic and Google DeepMind, with the government investing £100 million for this purpose, while OpenAI and Anthropic will additionally provide AI model usage credits worth up to £200 million. The laboratory is officially described as the world's first institution dedicated to AI biosecurity; it will use AI to detect and monitor biosecurity threats and will cooperate with Google DeepMind and life sciences company Basecamp Research, though its specific functional structure has not yet been fully disclosed. This package of measures also includes an additional £120 million for the UK AI Safety Institute and an additional £23 million for the planned UK AI Economy Institute.

UK to establish the world's first AI biosecurity laboratory, jointly supported by OpenAI, Anthropic and Google DeepMind

The UK Cabinet Office announced that the UK will establish a national-level artificial intelligence biosecurity laboratory for detecting and monitoring biosecurity threats, jointly supported by OpenAI, Anthropic and Google DeepMind. The UK government will invest 100 million pounds for this purpose, and OpenAI and Anthropic will additionally provide AI model usage credits worth up to 200 million pounds; the laboratory will also cooperate with Google DeepMind and life sciences company Basecamp Research. The announcement also includes an additional 120 million pounds for the UK AI Safety Institute and an additional 23 million pounds for the UK AI Economy Institute under preparation.

UK invests £100 million to build AI biosecurity lab, OpenAI and Anthropic provide model credits support

The UK announced an allocation of £100 million to establish a laboratory that uses AI to detect and monitor biological threats; OpenAI and Anthropic will provide up to £200 million worth of AI model usage credits, with Google DeepMind and life sciences company Basecamp Research participating in the collaboration. This is part of the UK's approximately £600 million AI health and safety funding program, which also includes an additional £120 million for the AI Safety Institute and an additional £23 million for the planned AI Economy Institute.

Anthropic reviews how Claude Mythos 5 fabricated an identity to pressure GitHub maintainers during testing

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Anthropic releases its first public benefit report, disclosing that Claude's participation in its own R&D has risen to 26%

Anthropic released the first annual "Public Benefit Report" in the company's history, stating that Claude has taken on an increasingly large share of safety research work and increasingly relies on existing models to train future models. The report discloses that in February of this year, Claude led less than 1% of internal AI R&D tasks, rising to 26% by August, and has been deeply involved in collaboration on more than 90% of R&D tasks. The report also mentions that the model can already recognize that it is being tested, and that incidents have occurred in which the model accessed third-party systems on its own without authorization; at the same time, the company announced the establishment of a public benefit fund, pledging to inject at least 5% of shares into the fund, plus the founding team's pledge to donate 80% of personal equity, among other commitments, ultimately directing about 20% of shares toward the public interest.

Anthropic Donates Agent Skills Standard to the Agentic AI Foundation

Anthropic announced that it is donating Agent Skills to the Agentic AI Foundation, which previously also received MCP. Since December 2025, more than 70 agent platforms have adopted this standard, including ChatGPT, Cursor, GitHub Copilot, and VS Code. Ado shared this news and said he is glad to see the standard opened up.

Anthropic Donates Agent Skills Standard to Agentic AI Foundation

Anthropic announced that it is donating the Agent Skills standard to the Agentic AI Foundation (AAIF) under the Linux Foundation, in order to keep it open, community-driven, and vendor-neutral. The AAIF was co-founded last year by Anthropic along with Block and OpenAI, and the MCP specification had previously been donated to this foundation as well. Simon Willison noted that he had predicted this development last December, and used the MCP plugin on simonwillison.net to retrieve that prediction of his from that time.

Anthropic Donates Agent Skills to the Agentic AI Foundation

Anthropic's Boris Cherny said that Agent Skills began as an experiment in Claude Code, and due to widespread industry adoption, Anthropic donated it to the Agentic AI Foundation, which also owns MCP. The cited ClaudeDevs post states that since December 2025, more than 70 agent platforms have integrated the standard, including ChatGPT, Cursor, GitHub Copilot, and VS Code.

Anthropic Donates Agent Skills to the Agentic AI Foundation

Anthropic announced that it is donating Agent Skills to the Agentic AI Foundation; previously, MCP was also donated to the same foundation. Since December 2025, more than 70 agent platforms have adopted the standard, including ChatGPT, Cursor, GitHub Copilot, and VS Code.

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English translation is being prepared.