SpaceXAI Open-Sources Grok Build: The Rust Agent Harness, TUI, and Tool Layer Behind Its Coding CLI
SpaceXAI has released the source code for Grok Build, a Rust-based agent framework used in its coding CLI. The release is under the Apache 2.0 license but does not include the Grok 4.5 model itself.
- SpaceXAI released the Rust source code for Grok Build under an Apache 2.0 license.
- The code includes the agent loop, tool dispatch, TUI, and extension system.
- The Grok 4.5 model weights remain closed source.
- External contributions to the repository are currently disabled.
SpaceXAI published the source code for Grok Build on July 15, 2026. This Rust codebase serves as the underlying infrastructure for the company's coding CLI, handling the agent loop, tool dispatch, and the terminal user interface.
The release is licensed under Apache 2.0, which allows for broad usage and integration. However, the company explicitly stated that the core Grok 4.5 model remains proprietary and closed source.
While the code is available for inspection and use, SpaceXAI is not accepting external contributions at this time. This move provides developers with a reference implementation for building sophisticated agent systems in Rust.
Offers a reference architecture for building Rust-based AI agents and CLI tools.
Highlights the trend of major AI firms open-sourcing infrastructure while keeping models proprietary.
- TUI
- Text User Interface, a command-line interface that uses text for interaction.
- Agent Loop
- The cycle where an AI perceives, reasons, and acts to complete a task.
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