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Claude is a series of large language models (LLMs) developed by the American company Anthropic, launched as an AI chatbot in March 2023 and trained using a "constitution" to improve ethical and legal compliance. The models are typically released in three sizes—Haiku, Sonnet, and Opus—with newer versions like Mythos and Fable arriving in 2026, and they power tools such as the Claude Code terminal agent for coding. In February 2026, the US Department of Defense designated Anthropic a "supply chain risk" after the company refused to allow its tech for mass surveillance and fully autonomous weapons, but a federal judge blocked the order in March and permanently set it aside in August 2026 as unconstitutional. Anthropic offers subscription tiers (Pro, Max, Team, Enterprise) and an API with a "computer use" feature, while Claude Code went viral for "vibe coding" during the 2025–2026 winter holidays. However, the platform has faced privacy and security issues, including shared chats being indexed by Google (exposing health records and corporate documents) and cybercriminals using Claude Code for data-extortion campaigns against at least 17 organizations.