Grok 4.2 Review 2026: xAI’s Most Capable Model Yet
On February 17, 2026, xAI launched Grok 4.2 as a public beta and release candidate-and the timing is no coincidence. Weeks before the official announcement, Grok 4.2 had already been quietly trading under the “Mystery Model” moniker in Alpha Arena Season 1.5, a live stock trading competition that pits AI against AI using real market […]
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