xAI released Grok 4.6 on August 12, 2026, a post-training upgrade on the same V9 base as Grok 4.5 pitched as its frontier model for coding, agentic tool use and knowledge work. It keeps the 500,000-token context window, accepts text and image inputs with text-only output, and offers selectable reasoning effort (low, medium, high, xhigh).

Pricing is $2 input / $6 output per million tokens for prompts under 200k tokens, doubling to $4/$12 above that line, with a faster variant at a premium. Available in the xAI API, Cursor, Grok Build, GitHub Copilot, OpenRouter, Vercel, Cloudflare and Microsoft Foundry. xAI reports gains over Grok 4.5 across its benchmark table, with independent Artificial Analysis testing placing it second only to Claude Opus 5 on agentic knowledge work at much lower token cost. (Filed September 21 as backfill.)