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Grok 4.8 will debut with at least a 1440 score on the Arena.AI text overall no-style-control leaderboard by June 30, 2027, and SpaceXAI will force a reordering of contenders. Elon Musk publicly announced Grok 4.8 on September 13, 2026, as a 2.5-trillion-parameter model, and Musk had said pre-traini…