Claude Code Opus

Claude Code Opus is a terminal-based agentic tool that pairs Anthropic’s most intelligent model with direct filesystem access to automate complex engineering tasks.

Claude Code Opus transforms software development from manual tinkering into an industrial-scale process by combining the Claude Opus 4.6 model with a command-line interface. Unlike standard chat assistants, this agentic duo reads and writes files directly, executes terminal commands, and manages multi-step refactoring across massive codebases using a 1-million-token context window. It eliminates manual context-pasting by maintaining a local CLAUDE.md memory file and offers an effort parameter (low, medium, high) to balance deep reasoning with token efficiency. Engineers use it to find zero-day vulnerabilities, debug production environments in a loop, and delegate high-stakes planning that previously required constant human oversight.

https://www.anthropic.com/claude-code