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Claude Code terminal with an AI coding agent

What Is Claude Code? The 2026 Guide for Founders and Senior Devs

Claude Code is Anthropic's coding agent: it reads your codebase and opens review-ready PRs from the terminal, VS Code, JetBrains, the desktop app, or the web. Features, release date, Opus 5.5 and Sonnet 5 models, plans from $17/month, Claude Console, and how it compares with Cursor, Copilot, and Codex.