Grok-Code-Fast-1: xAI’s agile and economical AI model specialized in programming

xAI has announced the launch of grok-code-fast-1, an artificial intelligence model developed specifically to optimize agile programming workflows and address the speed limitations faced by developers with current systems.

The new model was built from scratch with a completely new architecture, using a pre-training corpus rich in programming-related content. During post-training, the company employed high-quality datasets reflecting real-world pull requests and coding tasks.

A key feature of grok-code-fast-1 is its processing speed. According to xAI, the model can execute dozens of tools before the user finishes reading the first paragraph of the reasoning process. This speed results from innovative techniques developed by the company’s inference and supercomputing teams, along with caching optimizations that achieve hit rates above 90% when used with launch partners.

The model is versatile across the full software development stack, with particular proficiency in TypeScript, Python, Java, Rust, C++, and Go. It can complete common programming tasks with minimal supervision, from building projects from scratch to performing precise bug fixes and answering codebase queries.

In terms of performance, grok-code-fast-1 scored 70.8% on the full SWE-Bench-Verified set using xAI’s internal evaluation system. The company complements these metrics with routine human assessments conducted by experienced developers to measure end-to-end performance in everyday tasks.

The model is available with economical pricing: $0.20 per million input tokens, $1.50 per million output tokens, and $0.02 per million cached input tokens. For a limited time, xAI provides free access through launch partners including GitHub Copilot, Cursor, Cline, Roo Code, Kilo Code, opencode, and Windsurf.

xAI designed grok-code-fast-1 to be widely accessible, balancing performance and cost in a compact format effective for handling common programming tasks quickly and efficiently.

Key points

• xAI launches grok-code-fast-1, its AI model specialized in agile programming and software development.
• Processes multiple tools simultaneously, delivering very fast responses in coding tasks.
• Built from scratch with a new architecture and trained with a programming-focused corpus.
• Excels in TypeScript, Python, Java, Rust, C++, and Go, covering the full development stack.
• Achieved 70.8% on SWE-Bench-Verified according to xAI internal assessments.
• Available for free for a limited time on GitHub Copilot, Cursor, Cline, Roo Code, Kilo Code, opencode, and Windsurf.
• Economical pricing: $0.20 per million input tokens, $1.50 per million output tokens, $0.02 per million cached tokens.
• Caching optimizations achieve hit rates above 90% with launch partners.
• Capable of completing tasks from building projects from scratch to precise bug fixes with minimal supervision.
• Designed to balance performance and cost in a compact format, optimized for common programming tasks.