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xAI releases Grok 4 and a SuperGrok Heavy tier for Grok 4 Heavy

See how this story connects

Source: xAI

xAI released Grok 4 with native tool use and real-time search for SuperGrok and Premium+ subscribers and through its API, plus a Grok 4 Heavy version on a new SuperGrok Heavy tier. xAI said it ran reinforcement learning at pretraining scale on Colossus, its 200,000-GPU cluster.

Why it matters

xAI said it used Colossus, its 200,000-GPU cluster, to run reinforcement learning for Grok 4 at pretraining scale, and added a new top-priced subscription tier.

When
9 Jul 2025
ID
WTA-N-2025-0186
Who
xAI

Summary by wheresthe.ai, from xAI. Checked against the source on 9 Oct 2026.

Read the original at xAI

Source copy: download the page as saved on 18 Oct 2026 (PDF). Also held by the Internet Archive.

Next stop on this Storyline: What happened nextxAI releases Grok 4.7 on a larger base model at Grok 4.6 prices

Cite this story

WTA-N-2025-0186: “xAI releases Grok 4 and a SuperGrok Heavy tier for Grok 4 Heavy.” wheresthe.ai, 9 Jul 2025. https://wheresthe.ai/d/xai-grok-4-release-2025-07/ (source: xAI).

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