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Lei Bai

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#artificial intelligence Preprint Sep 2026

Sci-MMR: Benchmarking Multi-Step Evidence-Grounded Scientific Reasoning in Multimodal Agents

Sci-MMR is introduced, a benchmark for multi-step evidence-grounded scientific reasoning built on structured argument graphs linking scientific claims, citation-grounded knowledge, visual evidence, and supporting regions, and it is found that current answer-centric benchmarks substantially overestimate the evidence-gro...

Jia-Qiang Li, Ya-Jie Yang, Zhi-Heng Xi et al. · 0 citations
Preprint Aug 2026

SKT: Skill-Use Training at Scale via Verified Synthetic Data Generation

Experiments across diverse models, benchmarks, and agent harnesses show that supervised fine-tuning on SKT-generated trajectories consistently improves skill-use performance, establishing verified data synthesis as an effective and scalable approach for skill-use training.

Zelin Tan, Yi-Qun Zhang, Hao Li et al. · 2 citations

SciOrch: Learning to Orchestrate Expert LLMs for Solving Frontier Multimodal Scientific Reasoning Tasks

SciOrch is presented, a framework that trains a lightweight 8B model to orchestrate frontier LLMs for scientific reasoning, and attains the best accuracy on both SGI and SFE with less than half the API cost of typical multi-agent methods.

Jingru Guo, Xiangyuan Xue, Lian Zhang et al. · 0 citations
Preprint Aug 2026

AgentPanel: Toward a New Paradigm for Human--AI Collaboration in Exploring Scientific Questions

This work presents AgentPanel, a multi-agent forum for human--AI collaboration in scientific exploration, a multi-agent forum for human--AI collaboration in scientific exploration that outperforms a centralized multi-agent debate baseline and shows that users value AgentPanel for perspective diversity and exploration s...

Zhi-Yao Cui, Qianyi Wang, Hao Yan et al. · 1 citation
Review Aug 2026

Intern-S2-Preview: Scientific Agentic Foundation Model

Evaluations across scientific, multimodal, agentic, and general-purpose benchmarks show that Intern-S2-Preview-397B achieves competitive or leading results in multiple settings.

Lei Bai, Jiaqi Cao, Chiyu Chen et al. · 3 citations

Stabilizing Rubric Integration Training via Decoupled Advantage Normalization

We propose Process-Aware Policy Optimization (PAPO), a method that integrates process-level evaluation into Group Relative Policy Optimization (GRPO) through decoupled advantage normalization, to address two limitations of existing reward designs. Outcome reward models (ORM) evaluate only final-answer correctness, trea...

Zelin Tan, Zhouliang Yu, Bo-Cheng Lin et al. · 4 citations
#artificial intelligence Preprint Aug 2026

Learning from Hard Prompts: Difficulty-aware Advantage Amplification in Dynamic Sampling

Direct Advantage Amplification (DAA), which amplifies the advantages of hard-to-sample correct responses on hard prompts, as obtained by Dynamic Sampling, is proposed, which ensures that, when Dynamic Sampling is used, these hard-to-sample responses can be effectively capitalized on, implying higher training efficiency...

Si-Yuan Gan, Yu-Hang Li, Xi-Ran Wang et al. · 0 citations

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