Recently, after LLMs have evaluated as AI Chat-Bots, software engineers adapted to use AI generated software codes within their projects. For sustainable codes clean coding is one of the accepted approaches. The practices encourage readable, maintainable codes aiming improving code quality. In our work, we tested well-known chatbots and analyzed engineered software codes against clean coding principles. The work is not only examining current state but also includes prior versions of Chat-Bots, tend to forecast their future inclination for sustainable software codes. We put forward that chatbots are evolving as more efficient result producers, but the sustainability of the software codes they offer should be questioned in terms of maintenance. The study exposed that, between former versions, the steps taken are not desirable in the route of sustainability.