Training
You Only RL Once
2025ResearchUpdated: 22 September 2026Published
Key
innovation
Concentrating RL cost and effort into a single pass instead of many iterations.
Category
Training
Abstraction level
Pattern
Operation level
Post-trainingTraining
Use cases
LLM post-trainingReasoning trainingRL cost reduction
How it works
The entire RL budget is spent in one carefully designed policy-training pass rather than spread across many iterations.
Problem solved
Multiple RL rounds for LLMs are computationally expensive and unstable (policy drift, entropy collapse).