Bullet

Bullet is a desktop and CLI coding agent built for speed. Instead of watching your AI assistant churn through slow tool calls, Bullet strips away the overhead. It routes straightforward coding tasks to lightweight models and only escalates complex problems to heavier reasoning engines — so you're not waiting around when all you needed was a quick file edit or a simple refactor. The result is an agent that keeps up with your actual workflow, not one that forces you to work at its pace.

What makes Bullet different is how it handles code. Instead of embedding your entire repository (which is slow and wasteful), it uses targeted search and file reads to find exactly the relevant code sections. Independent tool calls — like searching, reading, and verifying — execute in parallel, and the system catches duplicate calls or stuck loops before they eat up time. Bullet scored 95.8% on SWE-Bench Verified, a benchmark for real-world coding tasks, which backs up its speed claims. You can install the macOS or Linux desktop app, or run it entirely from the command line with a single npm command. Both are free during the private beta, no API key required.

Bullet is for developers who spend hours inside AI-assisted coding loops and want to cut that time down. It's especially useful when working with large codebases where every second of context-loading adds up. Whether you're refactoring, debugging, or writing new features, Bullet aims to be the agent that gets out of your way — not one that slows you down. Y Combinator backs the project, and the team built it out of their own frustration with existing agent tools.