Agent Arena review: Gemini 4 Argon and MiMo-V2.6 rise in complex tasks

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Arena's Agent Arena review observes that Google DeepMind and Xiaomi's MiMo are the biggest winners as tasks become more complex. In simpler tasks, OpenAI and Anthropic hold 10 of the 11 top spots in the frontier leaderboard. However, in the most expensive 5% of sessions, they only occupy 7 seats, leaving room for Gemini 4 Argon and MiMo-V2.6 Flash/Pro.

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