xAI LLM Big Closed weights

Grok 4

491 days since xAI announced it · 9 Jul 2025

Grok 4 is a closed-weights LLM from xAI, announced 9 Jul 2025. Its context window is 256K tokens.

Input: —; per 1M tokens
Cache write: —; per 1M tokens
Cache read: —; per 1M tokens
Output: —; per 1M tokens
Context window: 256K; tokens
Parameters: —; not disclosed

No price on the lab’s own pages.

Announcement: x.ai/news/grok-4

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We haven’t written about Grok 4 yet.

xAI · Big

closed weights

A new one every ~40 days — due now.

Grok 4.7 +40d 21 Sep 2026
Grok 4.6 +27d 12 Aug 2026
Grok 4.5 +241d 16 Jul 2026
Grok 4.1 +131d 17 Nov 2025
Grok 4 9 Jul 2025

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Facts last updated 1 Nov 2026, from xAI’s own pages.