MYSTERIOUS New Claude Model, Grok 4.6 TODAY, Muse Glimmer 30B, New OpenAI Model, & More! AI News

AI news roundup covering Anthropic's claim that an unreleased Claude model advanced a Riemann-hypothesis-adjacent bound, plus Claude watermarking, Meta's Muse Glimmer, Grok 4.6, and more — for AI-new…