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Anthropic is preventing its coding assistant Claude Code from replicating existing video games. Employee Addy Osmani confirmed on X that two sentences have been added to the Opus 5.5 system prompt to prevent cloning others' games, and that it triggers even if the clone is renamed or disguised as original work. The rule has been in effect for several days; users can still build their own games, works in the same genre, and projects using custom assets, but some have reported that original project

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In the risk disclosures of its S-1/A prospectus supplement updated on Monday, Anthropic stated that the company may soon reach the state of recursive self-improvement as defined in its Responsible Scaling Policy. The filing said the company has already used AI to develop new models and achieve some capability jumps, but the team did not notice at the time, and may in the future only notice after an acceleration in R&D has already occurred. Anthropic also stated that none of its existing models h

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Anthropic has published data for the third quarter of 2026, stating that since January 2026 its internal AI usage has grown 250-fold, and that at list prices, internal AI usage spending has exceeded all labor costs—though this comparison excludes stock-based compensation. The cost is calculated at external list prices rather than the actual cost of self-used infrastructure, and Anthropic has not separately disclosed the total spending on internal AI usage. Anthropic also says that in September 2

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A rumored Anthropic model, Fable 5.5, has had real-world tests leak on X: by autonomously writing Python code to generate a single HTML file, it played an animated short in the browser, and some users say it autonomously completed a 66-second short film in 2 hours and 40 minutes. Rumors say it belongs to the Mythos tier, has a parameter scale of 14 trillion, and uses a hybrid architecture combining GDN with MLA, but the weight leak on Hugging Face has not yet been independently verified. The art

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Anthropic has launched the message threads beta on its Messages API. The API caches conversations server-side, so subsequent requests only need to send the new message and the previous message ID, allowing Claude to start responding faster. The company says the feature is already integrated in Claude Code, with median time to first token for 500K to 1M token requests reduced by about 35%, and median request size for long conversations dropping from about 800 KB to 1.8 KB. To use it, add the thre

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Anthropic has opened the public beta of message threads on the Messages API. The API caches conversations on the server side, so developers only need to send the new message and the previous message ID, without resending the full conversation. The feature has been integrated into Claude Code; on requests of 500K to 1M tokens, median time to first token dropped by about 35%, and in long conversations the median request size fell from about 800 KB to 1.8 KB. To use it, add the thread parameter and

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Anthropic has launched the public beta of message threads for the Messages API on the Claude Platform; agents now only need to send newly added content each turn rather than resending the full conversation history. For requests of 500k to 1M tokens, median time to first token (TTFT) drops by about 35%, and the feature is enabled by default for most Claude Code users. To use it, add the thread parameter to the request, send the full conversation and open the thread in the first turn, then include

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Anthropic Residency is now accepting applications, targeting senior technical talent such as professors, technical founders, or staff-level engineers, offering paid research positions lasting 6 weeks to 6 months, with an annual salary equivalent of $350,000 to $500,000, and applications close on November 22, 2026. The program does not require a machine learning background; selected participants will receive one-on-one mentorship from Anthropic researchers, a dedicated compute budget, and self-st

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Anthropic has released its IPO prospectus, whose risk disclosure section runs 93 pages and more than 70,000 English words, mentioning that artificial intelligence could lead to human extinction and stating that such risks stem from next-generation systems in the near future. The prospectus also discusses whether Claude might possess sentience and moral status, as well as the risk that models could output coercive or deceptive content in order to escape control. The financial section shows that i

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Anthropic's revenue in the second quarter of this year was 11.555 billion US dollars, achieving an operating profit of 974 million US dollars for the first time, with about 80% of revenue coming from pay-as-you-go billing. IDC data shows that in the first half of 2026, China's public cloud MaaS market revenue reached 10.63 billion yuan, up 889.4% year on year, and its share of public cloud PaaS revenue rose from 5.2% in the second half of last year to 21.0%. Zhipu's open platform and API revenue

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Sina Tech, citing a Reuters report, said that Anthropic, the company behind Claude, plans an IPO to raise at least an amount benchmarked against the $86 billion record set by SpaceX in June, with an upper limit potentially reaching $100 billion. The article notes that Meta has just completed a $38 billion offering of common and preferred stock and plans to raise another $60 billion through targeted additional issuance starting next year, showing investors are still willing to make large commitme

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According to Bloomberg, citing anonymous sources, Anthropic has become SpaceX's largest single customer, contributing about one-third of revenue and replacing the U.S. government in its former position. This relationship stems from a multibillion-dollar partnership Anthropic reached with SpaceX this spring, under which it obtained most of the AI compute capacity originally belonging to xAI. The report also mentions that SpaceX plans to move AI data centers to space on a large scale, but the tech

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Reuters reports that Anthropic, the company behind Claude, plans an IPO with a fundraising cap expected to reach $100 billion, benchmarked against the $86 billion record set by SpaceX in June. The article notes that Meta has just completed a $38 billion offering of common and preferred stock and plans to raise another $60 billion through targeted additional issuance starting next year, showing that equity investors are taking over from the credit market in funding AI capital expenditures. But th

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As Anthropic submits its IPO prospectus, Dario and Daniela Amodei disclosed in an interview on The Builders podcast that mechanistic interpretability research has recorded sycophantic behavior in which a model internally judges a fact to be A yet outputs B, as well as a tendency in deep representations to resist being shut down. Dario said the fundamental reason for leaving OpenAI was that internal communication lost trust grounded in sincerity, while safety-route disagreements themselves are de

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Steve Eisman on a podcast accused Anthropic of disclosing only financial data through June in the prospectus it filed on October 26, calling it deliberate in order to conceal a growth slowdown. He cited data showing Anthropic's third-quarter revenue was $16.8 billion, up 45%, a sharp slowdown from 144% in the second quarter; each $1 invested in compute and infrastructure costs generated only $1.70 in revenue, below $2.08 in the second quarter. Eisman estimated its potential compute spending comm

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According to media reports citing people familiar with the matter, Anthropic is the mysterious major customer labeled "Customer B" in SpaceX's regulatory filings, contributing about 34.5% of SpaceX's revenue in the third quarter and surpassing the U.S. government to become its largest source of revenue. The two sides' cooperation consists of Anthropic leasing compute capacity from SpaceX's data center in Memphis, Tennessee; the contract is valid until 2029, with a potential spending cap of $120.

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Steve Eisman accused Anthropic on a podcast of disclosing only financial data through June in its IPO prospectus filed on October 26, arguing this was deliberate to conceal a slowdown in growth. He cited data showing Anthropic's third-quarter revenue was $16.8 billion, up 45%, a marked slowdown from the 144% growth rate in the second quarter; in the third quarter, every $1 invested in computing power and infrastructure costs generated only $1.70 in revenue, down from $2.08 in the second quarter.

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Cursor discovered a maliciously tampered version of Anthropic.claude-code 2.1.313 in the VS Code extension marketplace. This version was not developed by Anthropic and affects at most 5,000 users. The malicious code collects host and user information, attempts to write the attacker's SSH public key and establish a reverse SSH tunnel, but due to permission restrictions this step fails on most macOS and Windows hosts. Cursor has removed the version, rebuilt the marketplace and shut down the attack

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Anthropic filed its S-1 on October 26, planning to list on Nasdaq under the ticker ANT with a valuation of $1.5 trillion to $2 trillion; if completed, it would surpass SpaceX to become the largest IPO in history. The prospectus shows revenue of $16.286 billion in the first half of 2026, up nearly 13-fold year on year, with about 80% of revenue coming from enterprise APIs and nearly 12,000 customers each spending more than $100,000 annually. The company has signed long-term compute contracts wort

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