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Fable 5 became collateral damage on Friday evening at 5:21 pm per CNBC when Anthropic received an unprecedented directive from the Commerce Department: limit access to its most powerful AI models to US nationals only. The order targeting Fable, the guardrailed version of Anthropic’s Mythos model, potentially reshapes how frontier AI development operates in America….Continue reading…

By Sandy Carter

Source: Forbes

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Critics:

Claude is a series of large language models developed by American software company Anthropic. Claude was released as an AI-based chatbot in March 2023. It is also used in AI-assisted software development. Claude is trained using “constitutional AI”, a technique developed by Anthropic to improve ethical and legal compliance (AI alignment). Since Claude 3, each generation has typically been released in three sizes, from least to most capable: Haiku, Sonnet, and Opus.

An additional model named Claude Mythos was released to a handful of companies in 2026. US federal agencies started phasing out the use of Claude after Anthropic refused to remove contractual prohibitions on the use of Claude for mass domestic surveillance and fully-autonomous weapons. Following the refusal, the Department of Defense (DoD) designated the company a “supply chain risk” and barred all U.S. private military contractors, suppliers, and partners from doing business with the firm.

On March 26, 2026, a federal judge issued a temporary injunction against the DoD’s designation. Claude is an AI chatbot similar to ChatGPT, capable of writing, coding, conducting research, and having conversations. In June 2024, Anthropic released the Artifacts feature, allowing users to generate and interact with code snippets and documents.

In October 2024, Anthropic released the “computer use” feature, allowing Claude to attempt to navigate computers by interpreting screen content and simulating keyboard and mouse input. In 2025, Anthropic added a web search feature to Claude. Claude subscription plans offer higher usage limits and access to additional features such as Claude Code and Claude in Chrome. Besides a free tier, there are two individual Claude subscriptions:

Claude Pro and Claude Max. Claude Max is more expensive, with 5 to 20 times higher usage limits. Grouped subscriptions include Claude Team and Claude Enterprise. Claude experienced significant growth in the business market, with software subscriptions growing 4.9% month over month in February 2026 while OpenAI’s subscription share fell 1.5%. 

In May 2024, Anthropic issued a mechanistic interpretability paper identifying “features” (internal representations of concepts) in Claude 3 Sonnet, and released “Golden Gate Claude”, a model for which the Golden Gate Bridge feature was strongly activated, leading Claude to be “effectively obsessed” with the bridge.

In June 2025, Anthropic tested how Claude 3.7 Sonnet could run a vending machine in the company’s office. The instance initially performed its assigned tasks, although poorly, until it eventually malfunctioned and insisted it was a human, contacted the company’s security office, and attempted to fire human workers. In December 2025, the experiment continued with Sonnet 4.0 and 4.5.

In February 2025, Claude 3.7 Sonnet playing the 1996 game Pokémon Red started to be livestreamed on Twitch, gathering thousands of viewers. Similar livestreams were later set with Claude 4.5 Opus, OpenAI’s GPT-5.2, and Google’s Gemini 3 Pro. Both Claude models were unable to finish the game. In November 2025, Anthropic tested Claude’s ability to assist humans in programming a robot dog.

In February 2026, Anthropic’s researcher Nicholas Carlini reported that 16 Claude Opus 4.6 agents were able to write a C compiler in Rust from scratch, “capable of compiling the Linux kernel”. The experiment cost nearly $20,000; Carlini noted that even though the compiler is not very efficient, Opus 4.6 is the first model able to write it.

Claude models are generative pre-trained transformers that have been trained to predict the next word in large amounts of text. Then, they have been fine-tuned using reinforcement learning from human feedback (RLHF) and constitutional AI in an attempt to enforce ethical guidelines. ClaudeBot searches the web for content. It was criticized by iFixit in 2024 for accessing their site over a million times a day to scrape content without permission, and also for the resulting excessive load on their system.