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Mechanical properties of organic/inorganic thin‐films prepared from bridged silicon precursors have been investigated. The Young's modulus follows a linear decay when porosity is introduced, a unique observation as compared to traditional organosilicates. Remarkably, in the dense state, fracture energies of 15–17 Jm–2 were measured, values that are larger than those for dense SiO 2 (10 Jm–2), dispelling the common belief that all organosilicates are fragile and prone to fracture.