Has the AI race shifted from U.S. vs China to open vs closed?

Chinese AI labs are releasing competitive, low-cost open-source models like DeepSeek V4 Flash that challenge U.S. closed systems, driven by U.S. export controls that forced innovation in algorithm optimization. The article argues the global AI race is shifting from a U.S.-China rivalry to an open-source versus closed-model competition, with open-source models achieving capability parity at lower costs.