What is the difference between OSI model and TCP/IP other than the number of layers?

The Open Systems Interconnection (OSI) model is a standard "reference model" created by the International Organization for Standardization (ISO) to describe how the different software and hardware components involved in a network communication should divide labor and interact with one another. It defines a seven-layer set of functional elements, ranging from the physical interconnections at Layer1 (also known as the physical layer, or PHY interface) all the way up to Layer7, the application layer.

The Transmission Control Protocol (TCP) and the Internet Protocol (IP) are two of the network standards that define the Internet.  IP defines how computers can get data to each other over a routed, interconnected set of networks.  TCP defines how applications can create reliable channels of communication across such a network. Basically, IP defines addressing and routing, while TCP defines how to have a conversation across the link without garbling or losing data.  TCP/IP grew out of research by the U.S. Dept. of Defense and is based on a loose rather than a strict approach to layering. Many other key Internet protocols, such as the Hypertext Transfer Protocol (HTTP), the basic protocol of the Web, and the Simple Mail Transfer Protocol (SMTP), the core email transfer protocol, are built on top of TCP. The User Datagram Protocol (UDP), a companion to TCP, sacrifices the guarantees of reliability that TCP makes in return for faster communications.

TCP/IP doesn't map cleanly to the OSI model, since it was developed before the OSI model and was designed to solve a specific set of problems, not to be a general description for all network communications.

OSI Model is the standard it like a reference

TCP/IP is what actually working.

The shortest answer I can come up with:

The OSI model covers everything from the wires and connectors all the way up to the Application.

TCP/IP are two of the layers in the OSI model.

OSI Model is a theoretical  model however, TCP/IP model can be practically implemented.

OSI do not support the Internet that;s why Internet follow the TCP/IP model.