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We are at a unique time to study giant exoplanets. With more than 5000 exoplanets found and facilities like the James Webb Space Telescope that provide unprecedented data on their atmospheres, we moved from an era of discovery to an era of exoplanet characterisation. At the same time, precise measurements from missions like Juno and Cassini to Jupiter and Saturn, lead to a different way of looking at giant planet interior structures, that challenge traditional exoplanetary models. This is an exceptional time to combine the detailed information on the solar system's giant planets with the large amount of data from exoplanets to get a better understanding of planetary physics and a better comprehension of planet formation and evolution. In this talk, I will explore how integrating data from our solar system's giants with the growing wealth of exoplanet observations leads to the derivation of more realistic interior structures, opening the door to a new generation of interior models for giant exoplanets and transforming our understanding of planetary physics, formation, and evolution.