5. GFD Dennou Club AGCM6 We consider to develop a spectral GCM based on SPMODEL (GFD Dennou Club AGCM6). Development of AGCM6 is proceeded step by step. Level-1: spmodel-primitive Primitive equation model as a part of SPMODEL. It is a AGCM6 dynamical core model. Level-2: AGCM6 Prototype model of AGCM6-* at Level-3 used for simple experiment (ex. aqua-planet). Level-3: AGCM6-Earth/Mars/Venus Specialized model for each planetary atmosphere Physical processes are implemented as options of AGCM6.