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About this paper
Zilin Wang, Yinhong Liu, Chao Chen, Qun Liu, Zhijiang Guo
SpecAgent lets a Weak model draft grounded agent steps while a Strong model reviews segments, accepts the longest semantically valid prefix, and replaces a rejected state-changing action before it runs. On 50 τ²-Bench Airline tasks, it matches Strong-only at 86.0% Pass@1; estimated HBM-read falls to 43–45% and wall time to 41%, but FLOPs rise 30%, so the result does not prove equivalence.
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