SpaceXAI Releases Grok 4.6: A 500K-Context Frontier Model Tuned for Long-Running Agents, Coding, and Knowledge Work

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SpaceXAI, formerly xAI and now part of SpaceX Corp, released Grok 4.6 on August 12, 2026. This post-training upgrade to Grok 4.5 introduces a 500K context window and a new xhigh reasoning level, tying GPT-5.6 Sol Max at 61 on the Artificial Analysis Intelligence Index. While outperforming Claude Fable 5 in certain areas, it still lags in coding benchmarks. Pricing remains at $2/$6 per million tokens, targeting long-running agents, coding, and knowledge work.
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