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xAI Grok 4.20 has native 4-agent council (Grok = Coordinator/Synthesizer, Harper = Research/Facts/X-grounding, Benjamin = Logic/Math/Code, Lucas = Creative/Balance). They run in parallel on shared weights + KV cache. Internal structured debate rounds + RL-optimized orchestration. It has large gains in reasoning depth, fact-checking, blind-spot detection, and open-ended engineering without exploding costs (effective ~1.5–2.5× single-pass … Read more