Grok 4.8 has begun a limited soft rollout to Bot users, according to the official Grok account. The account posted the update on November 13, 2026, at 14:19 UTC, following Elon Musk’s November 10 statement that pretraining was complete and reinforcement learning was underway.
The announcement is narrower than a public model launch. It identifies Bot users as the rollout group, but gives no access instructions, eligibility rules or date for general availability. Neither post announces a Grok 4.8 API release.
Musk also described a substantial engineering change: xAI had replaced its reinforcement-learning and inference stack with a new C/C++ implementation. That is a significant claim about the infrastructure behind the model. Its practical benefits, including any improvements in speed, reliability or answer quality, still need published evidence.
What the Grok Account Actually Confirmed
The November 13 update appeared as a reply on X, not as a detailed release announcement. The official account stated:
“Soft rollout of Grok 4.8 to Bot users is underway this week after the full C/C++ stack rewrite.”
The key shift from Musk’s earlier update is the rollout’s status. On November 10, limited access was a plan for later that week. By November 13, the Grok account described it as underway.
“Bot users” is the audience named in both posts. Neither explains who qualifies, whether every eligible user receives access immediately, or whether users can select Grok 4.8 themselves. Readers should avoid mapping that wording onto a particular subscription, application or developer account without an explicit explanation from xAI.
A soft rollout generally means introducing a change to a restricted audience before expanding it. Here, the exact rollout controls remain unspecified. Calling this a limited deployment is supported; describing a particular testing process, participant count or access mechanism would go beyond the announcement.
I’d treat the post as an availability milestone for the named group. It gives other Grok users no actionable upgrade path yet.
Musk’s Update Separates Pretraining From Ongoing Work
Musk’s November 10 post supplied the technical context. He said xAI had dropped JAX/SGLang and:
