AdvertisementSKIP ADVERTISEMENTYou have a preview view of this article while we are checking your access. When we have confirmed access, the full article content will load.The SHIFTA new A.I. model, released by a scrappy Chinese upstart, has rocked Silicon Valley and upended several fundamental assumptions about A.I. progress.Markets panicked after DeepSeek’s breakthrough on cost challenged the “bigger is better” narrative that has driven the A.I. arms race in recent years.Credit...Bryan R. Smit...