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What Does Multi-Turn Reinforcement Learning Really Improve in LLM Agents?

Multi-turn agentic reinforcement learning (RL) improves long-horizon task performance, but those gains are highly sensitive to interaction constraints, according to an evaluation using Pass@(K,T) across sampling breadth K and interaction depth T. The evaluation shows trajectory-level RL advantages depend on sufficient interaction depth, indicating that reported gains for LLM agents hinge on how many turns and samples the agent is allowed.

read1 min views3 publishedNov 5, 2026

While multi-turn agentic reinforcement learning (RL) excels on long-horizon tasks, its performance gains remain highly sensitive to interaction constraints. Evaluating across sampling breadth K and interaction depth T via Pass@(K,T), we show that trajectory-level RL advantages depend on sufficient t

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