Grok Code Fast 1

Grok Code Fast 1 Description

Grok Code Fast 1 is xAI's specialized, fast, and economical coding assistant optimized for agentic coding workflows. It excels at handling high-volume, practical software development tasks including code generation, debugging, editing, and multi-step agentic operations. Built with speed, efficiency, and cost-effectiveness in mind, Grok Code Fast 1 is particularly proficient in TypeScript, Python, Java, Rust, C++, and Go, offering deep integration into developer pipelines with structured, traceable reasoning outputs.

Technical Specification

Performance Benchmarks

• Context Window: 256,000 tokens (max prompt + response)
• Max Output: Up to 16,000 tokens (playground capped)
• Architecture: 314B-parameter Mixture-of-Experts (MoE) for speed and capability
• Throughput: ~92 tokens per second

Performance Metrics

• Accurate across coding tasks with 93.0% coding accuracy and 75.0% instruction following accuracy
• Strong classification and knowledge performances: perfect in morality, email classification, general knowledge
• Reasoning Accuracy: 80.0%, with visible step-by-step reasoning traces for developer inspection and steering
• Competitive speed and throughput supporting real-time coding workflows

API Pricing

• $0.26 per million input tokens
• $1.95 per million output tokens

Key Capabilities

• Massive long-context handling for entire codebases or multi-file projects
• Agentic coding with native function/tool calls and multi-step operation chaining
• Traceable reasoning outputs revealing intermediate steps to boost transparency and steerability
• Multi-language support for practical software stacks including major modern programming languages
• Economical pricing designed for high-volume developer use and iterative workflows

Optimal Use Cases

• Agentic coding assistants for autonomous code writing, debugging, and system integration
• Large-scale codebase analysis and multi-file editing without coherence loss
• Coding research and evaluation demanding precise reasoning and logic transparency
• Integration into CI/CD pipelines with high throughput and cost efficiency

Code Sample

Comparison with Other Models

vs. Grok 4: Grok Code Fast 1 trades some general reasoning and tool-use sophistication for much higher speed and cost efficiency specifically in coding workflows. Grok 4 better supports complex AGI-style reasoning and tool integration beyond coding.

vs. Claude 4 Opus: Claude excels in language safety and nuanced instruction following, while Grok Code Fast 1 delivers faster, structured agentic coding with visible reasoning traces.

vs. GPT-4o: GPT-4o leads in multimodal and browsing features; Grok Code Fast 1 focuses on coding speed, throughput, and agentic tool-enabled workflows.

Limitations

• Text-only input/output; no vision, audio, or multimodal modalities
• No built-in reasoning beyond coding tasks; focused on practical tool-assisted code generation
• Only available on-demand in selected US regions, no dedicated server mode yet
• No support for streaming outputs or offline/local inference