PhantomEnvironments: Training LLM Agents in Fictional Worlds

Name: PhantomEnvironments: Training LLM Agents in Fictional Worlds
Uploaded: 2026-10-04T23:18:24.692815+00:00
Duration: 257 s
Description: The research shows that training LLM agents using synthetic environments generated entirely by rules—called PhantomEnvironments—is a highly effective method. These environments require no human or LLM input to create, making them cheap and verifiable. Agents trained this way show significant transfer to real-world search tasks, learning how to scale their search effort effectively.

The research shows that training LLM agents using synthetic environments generated entirely by rules—called PhantomEnvironments—is a highly effective method. These environments require no human or LLM input to create, making them cheap and verifiable. Agents trained this way show significant transfer to real-world search tasks, learning how to scale their search effort effectively.

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