Grok 4.6: same $2/$6 API price as 4.5, AA Intelligence Index 61

xAI launched Grok 4.6 on 12 Aug 2026 at the Grok 4.5 list price ($2 input / $6 output per 1M tokens under 200k prompt). Official evals: AA Intelligence Index 61 (tied GPT-5.6 Sol Max), Terminal-Bench v3 26%. Migrate off 4.5 with a model-name swap. Not on our LiveBench snapshot yet.