Grok-4.20

Multi-agent system with 4 specialized agents: Grok (coordinator), Harper (research), Benjamin (math/code), and Lucas (creative). ~3T MoE backbone. 2M token context. 250.9 tok/s output speed (#1 ranking).

Current xAI flagship. Also released as Multi-Agent Beta (March 2026). AA Intelligence Index: 48 (reasoning enabled). Proprietary.