Claude AI is an advanced conversational AI assistant created by Anthropic. It helps users with writing, research, code, summarization, reasoning, and handling complex documents. Claude can process text, image, and file inputs (e.g., PDFs, Word, Excel), enabling it to analyze and interact with user content effectively. Its defining “Constitutional AI” framework guides Claude’s behavior using ethical principles rather than relying on human feedback, promoting transparency, helpfulness, and harmlessness. Over time, Claude has evolved through versions—from Claude 3's Haiku, Sonnet, and Opus models to the latest Claude 4 Opus and Sonnet, and most recently Claude Opus 4.1—each offering improvements in reasoning, context window size, multimodal input, and tool integration. Claude supports powerful features such as “Artifacts” (for real‑time code/document generation and preview), “Computer Use” (ability to simulate mouse/keyboard and navigate the desktop environment), web search (initially for paid users in the U.S.), and Claude Code—an agentic terminal‑based coding assistant. Claude is accessible via web, desktop, mobile apps, API, and integrations like Slack and browser extensions, making it adaptable for individuals, developers, and enterprises across various workflows.