Agentic Focus (Non-Generative Utility): Grok 4.1 Fast is explicitly marketed and architected as an "agent-optimized model" tuned for speed, tool usage, and cost-efficiency, rather than raw peak reasoning (which belongs to the "Thinking" variant).1 It is designed to run multi-step workflows (plan 2$\rightarrow$ search 3$\rightarrow$ act) using its Agent Tools API.4 This confirms the "Surgeon Frame" logic: the value is the orchestration layer (Incision Strategy), not the tool itself (Scalpel).