Grok 4.6 matches GPT-5.6 Sol's intelligence at 60% lower cost and half the turns

On August 12, 2026, SpaceXAI shipped Grok 4.6, which scores 61 on the Artificial Analysis Intelligence Index — level with GPT-5.6 Sol — at $2/$6 per million tokens, and finishes long-horizon agentic tasks in half the turns of Claude Opus 5. For anyone building agents, the deciding variable is no longer the benchmark, it is the cost and token count burned per task.