OpenAI and Anthropic are selling the same next step for AI agents: more of them. Claude Code now forks subagents by default, and Sol Ultra fans a problem across up to 64. Google Research ran the controlled test, and the answer is a split: more agents help work that breaks into independent pieces and hurt work that runs as one dependent chain, by up to 70%. Which one your task is decides whether the swarm is an upgrade or a tax.

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