MetaX Weekly AI Trend Report Week 30 2025 -- AI Models That Dominated Math Olympiad: Technical Leap, US-China AI Hegemony Conflict Escalating Due to Illegal Chip Smuggling and Regulatory Refusal: OpenAI latest experimental reasoning model solved 5 out of 6 problems at the 2025 International Mathematical Olympiad, achieving 35 out of 42 points and a gold medal. Google also announced its model solved 5 of 6 IMO problems and officially received gold medal certification from the tournament coordinator. Polish programmer Psyho narrowly beat an advanced OpenAI model 1.8 trillion to 1.65 trillion points in a 10-hour AtCoder World Tour Finals competition -- this close result emphasized human competitiveness in high-stakes coding and received praise from Sam Altman. Anthropic researchers discovered that extending AI model reasoning time can paradoxically degrade performance -- challenging the assumption that more processing improves results; longer reasoning chains are not always beneficial and sometimes hurt performance in large models. US-China AI hegemony: AI chip smuggling through third countries (UAE, Malaysia, Singapore) is becoming a significant enforcement challenge for US export controls; NVIDIA chips continue to reach China through indirect channels despite legal restrictions; the geopolitical tension is accelerating both US enforcement tightening and China domestic chip development urgency.