Grok 4: launch capabilities and the 2025 release timeline
Scope and release timeline
This report describes the original Grok 4 launch and a later 2025 release. xAI announced Grok 4 on July 9, 2025, then announced Grok 4.1 on November 17, 2025. Grok 4 should therefore be read here as a historical release, not described as the latest model.[1][2]
What xAI announced at launch
xAI presented Grok 4 as a reasoning model with native tool use, including a code interpreter and searches of the web and X. Its announcement emphasized reinforcement learning and the model’s ability to use tools while working through tasks. These are the developer’s descriptions of the launch capabilities.[1]
Grok 4 and Grok 4 Heavy
The launch included Grok 4 Heavy, described by xAI as using parallel computation to explore multiple approaches to a problem. The announcement offered access through consumer subscriptions and the API. Those details describe the launch; they do not establish today’s pricing, limits or product availability.[1]
How to interpret performance claims
xAI’s announcement reported benchmark results and positioned Grok 4 strongly against competitors. A vendor announcement alone cannot establish that a model is best for every task. A useful evaluation should match the intended work, check outputs against evidence and compare the available products on the same tasks.[1]
The subsequent Grok 4.1 announcement
In November 2025, xAI announced Grok 4.1, emphasizing creative, emotional and collaborative interactions and improvements assessed in its own evaluations. That later announcement is a separate milestone. The original release report should not present planned 2025 developments as still upcoming.[2]
Reading this report today
Use the linked announcements to understand the 2025 release history. For a present-day adoption decision, check the current model documentation and available service rather than relying on historical launch pricing, unsupported architecture claims or an undated “latest” label.
Archived illustrations
The original report included these third-party images. They are retained as historical illustrations; the text above is grounded in xAI’s dated announcements. A third-party service’s price chart is not a statement of xAI’s current pricing.
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