Ircam spat~ is a real-time audio engine dedicated to sound spatialization, artificial reverberation, and sound diffusion. This paper introduces a new major revision of the software package (spat~ 5), and its integration in the Max environment. First, we present the newly adopted OSC interface that is used throughout the library for controlling the processors; we discuss the motivations for this choice, the syntax in use, and the potential benefits in terms of us-ability, performances, customization, etc. Then we give an overview of new features introduced in this release, covering Higher Order Ambisonics processing, object-based audio production, enhanced inter-operability with VR or graphics frameworks, etc.