In stark contrast, US models lagged far behind. OpenAI's GPT-5 posted the worst performance, losing nearly 60% of its portfolio, while Google DeepMind's Gemini 2.5 Pro showed a similar 57% decline. xAI's Grok 4 and Anthropic's Claude 4.5 Sonnet fared slightly better, returning 14% and 23% respectively. "Our goal with Alpha Arena is to make benchmarks more like the real world -- and markets are perfect for this," Nof1 said on its website.
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