Grok-4.20 Beta Reasoning

xAI · proprietary · grok-4.20-beta-0309-reasoning

Grok 4.20 Beta Reasoning is xAI's reasoning-optimized variant of the Grok 4.20 model family. Released as a beta on March 9, 2026, it uses thinking tokens for enhanced chain-of-thought reasoning, featuring a 2 million token context window for complex problem-solving tasks.