xAI has launched Grok Build, a local-first coding agent designed for developers that operates through an npm CLI and features a web UI with various developer controls. Additionally, the company introduced grok-code-fast-1, a reasoning model optimized for agentic coding, which includes support for tool use and prompt caching, along with a public API at a low cost for select partners. These developments highlight xAI's focus on enhancing developer productivity through innovative coding tools.