xAI: grok-4.20-reasoning

Grok-4.20-beta-0309-reasoning is the elite, high-intelligence tier of the Grok-4.20 family. It is built on a revolutionary "Society of Mind" multi-agent architecture, where four specialized agents (Captain, Research, Logic, and Critic) work in parallel to debate and verify findings before delivering the final response. Trained on the Colossus 200k GPU cluster using advanced Reinforcement Learning (RL), this model is specifically optimized for Expert-level tasks in medicine, legal analysis, and complex software architecture. It features "Chain-of-Thought" (CoT) reasoning that is 6x more compute-efficient than previous versions, allowing it to solve "Humanity's Last Exam" (HLE) level problems with unprecedented accuracy.