[3/27 03:00] Judge blocks Pentagon's Anthropic supply chain risk designation / Anthropic testing 'Mythos' its most powerful model ever

AI News Flash for March 27, 2026 at 03:00 UTC. Topics: 1. Judge blocks Pentagon's Anthropic supply chain risk designation https://techcrunch.com/2026/03/26/anthropic-wins-injunction-against-trump-administration-over-defense-department-saga/ 2. Anthropic testing 'Mythos' its most powerful model ever https://fortune.com/2026/03/26/anthropic-says-testing-mythos-powerful-new-ai-model-after-data-leak-reveals-its-existence-step-change-in-capabilities/ 3. Anthropic weighing IPO as soon as October https://www.bloomberg.com/news/articles/2026-03-27/claude-ai-maker-anthropic-said-to-weigh-ipo-as-soon-as-october 4. David Sacks steps down as AI czar, moves to PCAST https://techcrunch.com/2026/03/26/david-sacks-is-done-as-ai-czar-heres-what-hes-doing-instead/