We explore the use of light-induced mechanical nonlinearities to create basic information processing functionalities in optomechanical systems. Due to its high level of control and precise measurement capabilities, this platform could allow studying the fundamentals of computing performance near the thermal limit. Computation in the mechanical domain has also gained interest recently for its potential use in extreme environments. However, it is challenging to make mechanical logic gates cascadable for complex operations, and even more so to make them actively reconfigurable beyond a single function.

We realize programmable logic gates in nanomechanical resonators by using lasers to control mechanical nonlinearity through optical cavity dynamics. We demonstrate that a single nanobeam can achieve different types of logic gates through adjusting the laser drives. Additionally, we achieved adjustable cascading logic circuits using multiple mechanical modes of the same structure. Our findings pave the way for realizing complex and adjustable mechanical circuits without requiring large and complex structures, offering a promising route towards miniaturized and efficient mechanical logic devices.