Claude Code, developed by Anthropic, is a terminal-based AI coding assistant powered by the Claude 3.7 Sonnet model that allows developers to manipulate files, run commands, and execute complex coding tasks directly from their terminal. As a unique offering from a major AI provider, it integrates directly with Anthropic's API, bypassing intermediaries, and is designed for developers comfortable with command-line interfaces who work with large codebases or require quick understanding of unfamiliar code. Key features include code editing, test creation, Git operations, and codebase navigation, but it requires a research preview (beta) and can be costly, with usage fees ranging from $5-10 per developer per day for light use to over $100 per hour for intensive use. Users have reported its effectiveness in refactoring and debugging, though issues like slow response times and formatting challenges exist. Claude Code emphasizes security with a tiered permission system and direct API connection, though potential users should be aware of privacy considerations, as Anthropic may use feedback to improve their products.