[4/28 21:00] Oracle and CoreWeave drop on OpenAI growth worries / Meta rolls out Muse Spark Contemplating mode

AI News Flash for April 28, 2026 at 21:00 UTC. Topics: 1. Oracle and CoreWeave drop on OpenAI growth worries https://www.reuters.com/business/media-telecom/oracle-coreweave-shares-drop-after-report-flags-openai-growth-worries-2026-04-28/ 2. Meta rolls out Muse Spark Contemplating mode https://about.fb.com/news/2026/04/introducing-muse-spark-meta-superintelligence-labs/ 3. South Africa withdraws AI policy over AI-generated fake citations https://english.news.cn/africa/20260427/d98920d8c2cb456cb4e85535d2fcb7b3/c.html 4. AMD positions Ryzen AI Max for the Agent Computer era https://www.amd.com/en/blogs/2026/enabling-agent-computers-with-amd-ryzen-ai-max.html