An object-oriented application programming interface (API) derived from nextstep and proposed as an open standard by next in 1994.

OpenStep is the specification of the object kits of NEXTSTEP. OPENSTEP/Mach was an implementation of this specification. The original, OPENSTEP version 4.0, and really was NEXTSTEP 4. rhapsody was the codename for apple's mac os x Server, which is really NEXTSTEP 5 (it calls itself "kernel 5.3" at boot time).

OpenStep was designed to be implemented independently of the computer's operating system, hardware, and user interface. The api for rhapsody will be a superset of openstep's.

When the OpenStep api is implemented for a specific platform and made into a product, it is written in uppercase, e.g. OPENSTEP Developer 4.2 for Mach, or OPENSTEP Enterprise for windows nt and windows 95. Versions of OPENSTEP exist for Windows 95/NT, Solaris, HP/UX, and Mach.