Grok 4.6 runs on the exact same 1.5 trillion parameters as Grok 4.5. xAI got a 5-point intelligence jump by retraining weights it already had. Every gain in this launch came from post-training. Better supervised fine-tuning, heavier reinforcement learning, identical foundation underneath. That is also why the price held at $2 in, $6 out per million tokens. Same weights cost the same to serve, so the improvement ships free. The agentic scores show where the RL went. APEX-Agents up 10 points.…