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20242026
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cs.SE2026

Doc2Harness: Benchmarking LLMs on Long-Horizon Harness Engineering of Coding Agents

Yuyao Ge, Shenghua Liu, Peizhong Gao +8

Agents driven by large language models are increasingly deployed on long-horizon tasks, where they use tools and modify real workspaces. How well they perform depends as much on th…

math.OC2026

Optimal High-Order Methods for Solving Monotone Variational Inequalities

Xinliang Zhang, Lesi Chen, Linxuan Pan +3

We study second- and higher-order methods for solving smooth monotone variational inequalities (MVI). Monteiro and Svaiter (SIAM J. Optim., 2012) showed that a second-order method,…

math.OC2026

Halpern Iteration Achieves th-Order Oracle Complexity for Monotone Variational Inequalities

Lesi Chen, Xinliang Zhang, Hengyu Wang +3

We study second- and higher-order methods for solving smooth monotone variational inequalities (MVI). Monteiro and Svaiter (SIAM J. Optim., 2012) showed that a second-order method,…

math.OC2026

Optimal Convex Optimization with Inexact Second-Order Oracles

Lesi Chen, Chengchang Liu, Luo Luo +2

In this paper, we present a novel second-order method called Accelerated Inexact Newton Extragradient (AINE) for convex optimization using -inexact Hessians. We show that AINE c…

math.OC2026

Second-Order Bilevel Optimization with Accelerated Convergence Rates

Sheng Yang, Chengchang Liu, Lesi Chen +1

This paper studies second-order methods for nonconvex-strongly-convex bilevel optimization. We propose a novel fully second-order bilevel approximation method (FSBA) that achieves…

math.OC2026

Solving Convex-Concave Problems with th-Order Oracle Complexity

Lesi Chen, Xinliang Zhang, Chengchang Liu +3

When the objective has Lipschitz continuous th-order derivatives, it is known that convex-concave minimax problems can be solved with th-order ora…