CNBC Daily Open: AI is carrying the weight of the U.S. market
1. Amazon signs $38 billion deal with OpenAI for cloud services. 2. OpenAI diversifies away from Microsoft as cloud provider. 3. Amazon shares hit record high following the announcement. 4. Nvidia benefits from U.S. license for chip exports to UAE. 5. Wider market caution as S&P 500 shows mixed performance.