Anthropic's family of large language models and the assistant product built on top of them. Positioned as the "thoughtful" alternative to GPT-2-lineage models and Google's Gemini — emphasizing reasoning, long context, and safety research. For Karthik's work, Claude is a core building block for SupportWire's agentic support flows and a daily tool for drafting, research, and product thinking. See also Claude Code for the CLI variant.