xAI's rapid internal roadmap continues to anchor trader sentiment on the next Grok 4.8+ release, with Elon Musk confirming on September 14 that the 2.5-trillion-parameter model, trained on the new C++ stack, had finished training and entered reinforcement learning. Grok 4.7 shipped publicly on September 21 after 4.6 in August, maintaining xAI's aggressive cadence while closing gaps on benchmarks against Anthropic's Fable and OpenAI's Astra-class systems. Expanded Colossus 2 compute supports the push toward Grok 4.9 and Grok 5, which Musk has flagged as potential AGI-level, though multimodal fixes and RL timelines remain key variables. No other lab has signaled plans to release a Grok-branded model, keeping focus on xAI's execution through year-end.