Grok 4.20 (Reasoning) is the reasoning-enabled configuration of xAI's Grok 4.20, utilizing extended internal thinking to work through problems before presenting answers. Combined with the model's native multi-agent architecture and cross-agent verification, it delivers the highest accuracy in the Grok lineup on tasks requiring deep logic, mathematical reasoning, and complex multi-step problem solving. It supports the same 2M-token context window, strict prompt adherence, and the industry's lowest hallucination rate among its class.