Maltego classic is the GUI which is limited to 10,000 entities per graph.
Maltego Classic is the professional version of Maltego and provides extended functionality and capabilities when compared with community version of the tool. Maltego Classic is a commercial application and requires a valid license key to use. The tool can be used in a commercial environment while the community version of Maltego cannot. Maltego Classic has the capability of creating graphs that are far larger than the ones created in the community version of Maltego as there is no limitation on number of entities that can be returned from a single transform. Additionally Maltego Classic includes a range of different formats that your graphs can be exported to.