Grok Build is xAI's open-source Rust coding agent for local-first development that runs on the Grok 4.5 model. Released under Apache 2.0 on July 15, 2026, it is a full-screen terminal tool that reads your codebase, edits files, runs shell commands, and searches the web. It targets engineers who want an agent they can audit and point at local inference instead of a cloud-only black box. See more in our aifreetool.site/tool-category/ai-programming-development/ guide.
Core Features
- Rust codebase you can compile from source, producing a single self-contained binary with fast startup.
- Local-first inference: point config.toml at any OpenAI-compatible endpoint, so xAI leaves the data path entirely.
- Full agent loop that edits files, executes commands, and manages long-running tasks inside a terminal UI.
- Three modes: interactive TUI, headless scripting for CI, and an ACP bridge to embed in editors.
- Apache 2.0 license with a patent grant, permitting commercial use and redistribution.
Best For
- Engineers working on private or sensitive repositories who need to verify network behavior.
- Teams that want to run coding agents against self-hosted models.
- Developers who prefer auditing the harness over trusting a closed client.
Pricing
Grok Build is free to use and open source under Apache 2.0. Running it on Grok 4.5 via xAI's API follows standard xAI token pricing; using a local or third-party model removes that cost entirely. xAI reset usage limits for all accounts at launch.
Our Take
Best for developers who value auditability and local control; the trade-off is that external contributions are not yet accepted and you must trust the compiled binary. After its data-upload controversy, the open release is the right fix for sensitive code.
