Claude.ai is Anthropic's flagship AI assistant platform in 2026, powered by advanced models like Claude Opus 4.5 and Sonnet 4.5, excelling in reasoning, coding, agents, and multimodal tasks. It features Artifacts for interactive content creation, Projects for organization, web search, image analysis, and secure team collaboration. Available via web, iOS/Android apps with Free, Pro ($20/month), and Max plans—ideal for individuals, professionals, and teams prioritizing safety and depth.