Symbiotic Cooperation for Web Agents: Harnessing Complementary Strengths of Large and Small LLMs. - Ruichen Zhang; Mufan Qiu; Zhen Tan 001; Mohan Zhang; Vincent Lu; Jie Peng 002; Kaidi Xu; Leandro Z. Agudelo; Peter Qian; Tianlong Chen 001 (CoRR, 2025)