Implicit Actor Critic Coupling via a Supervised Learning Framework for RLVR

> By treating the outcome reward as a predictable label, we reformulate the RLVR problem into a supervised learning task over a score function parameterized by the policy model and optimized using cross-entropy loss.

Isn't this how the Decision Transformer works? I don't see it in the references, so I'll be curious to compare the papers in more depth.

https://arxiv.org/abs/2106.01345

> By conditioning an autoregressive model on the desired return (reward), past states, and actions, our Decision Transformer model can generate future actions that achieve the desired return.

Lately it has crossed my mind that I haven't seen DT brought up much lately, it seemed really interesting when it was first published but I haven't read much follow-up work.

59.76% on AIME is really appealing. Without having had time to understand it and determine whether it's useful or not, I see this number as indicating that this could be a stepping stone on something like the o1-to-DeepSeek-R1 progression for thinking, where open source models eventually figured out how o1 worked, only for the less definite 'o1' and instead what Google achieved and OpenAI may have achieved on the 2025 IMO problems.

I stumbled across this AI paper just now. It sounds intimidatingly technical, but if you read the abstract and look at Figures 1 and 2 and Equation 6, I think it's got some neat and accessible conceptual ideas.

Supervised learning is a much more mature technology than reinforcement learning, so it seems like a good thing to leverage that.

Can somebody explain "Base" model in the charts? Are they saying that the original model (e.g. before they applied either their or comparable training methods) has better or similar performance on all benchmarks vs their own result?

Is this DPO?

I think you meant to link to

Implicit Actor Critic Coupling via a Supervised Learning Framework for RLVR https://arxiv.org/abs/2509.02522

not

Winning Gold at IMO 2025 with a Model-Agnostic Verification-and-Refinement Pipeline https://arxiv.org/abs/2507.15855