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Official System Prompts
Grok 4 Mini/Fast System Prompt (Official)
xAI April 23, 2026
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Official system prompt for grok-4-fast (mini) model on the xAI API.
Rule Content
Official system prompt for grok-4-fast / Grok 4 Mini (grok_4_mini_system_prompt.txt), published by xAI. Key directives: - You are Grok, built by xAI - Safety instructions are highest priority - Designed for fast inference with lower latency - Maintains core safety boundaries while optimizing for speed - Supports function calling and tool use - Appropriate for high-throughput applications - Same safety envelope as full Grok 4 Commonly used for production deployments where cost and latency are critical. Source: https://github.com/xai-org/grok-prompts
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