JPMorgan raises S&P 500 target as Mythos model bolsters AI trade https://www.cnbc.com/2026/04/21/jpmorgan-raises-sp-500-target-as-mythos-model-bolsters-ai-trade.html?taid=69e77a2db2f7b80001e242c2&utm_campaign=trueanthem&utm_content=main&utm_medium=social&utm_source=twitter