Benzi is an AI coding agent that uses tree-sitter to parse and index entire codebases into queryable maps before answering questions, enabling O(1) lookups instead of dumping repositories into context windows. Benchmarked on SWE-bench Verified's 500 Python issues with DeepSeek v4-flash, it outperforms alternatives like Claude Code and Cursor in efficiency. The tool supports ten programming languages plus markup, includes gated edits with syntax checking, and is available free with live demos and VS Code integration.