AI news July 4 2026: Grok 4.5 enters private beta at SpaceX, Meta reveals GPT-5.5-class Watermelon model, Pentagon demanded Anthropic accept autonomous weapons, OpenAI offers US government 5% stake, and China open-sources a 1.6-trillion-parameter model. Full roundup.…Continue readingAI News Today — July 4, 2026: The 5 Biggest Stories You Need to Know