Honda Motor and Nissan Motor are closing in on a potential agreement to jointly develop a shared operating system and onboard computer for next-generation vehicles, Nikkei reported Saturday. The system could enter new models as early as 2029, helping the automakers divide the high cost of software-defined vehicles while retaining differentiated designs and features. Honda said no deal had been decided and described the talks as potential collaboration with Nissan and Mitsubishi Motors under their existing strategic partnership. The discussions have continued for about two years and follow the collapse of Honda-Nissan merger talks over a proposed $60 billion automotive group. Nissan is also working with Wayve and Nvidia on driver-assistance and vehicle-computing technologies, while Honda has used Nvidia industrial design tools.