A closed-weight AI model is operated without distributing the parameter files required for independent local execution. Customers usually interact through an application programming interface or hosted product controlled by the provider.
The provider may offer strong reliability, support and managed infrastructure, but customers depend on its pricing, availability and data practices. Comparing closed and open models therefore involves governance and control as well as raw performance.
ELI5
A closed-weight AI model is used through a provider's service without receiving the model's learned parameter files. The provider runs the infrastructure and decides which versions and capabilities customers can access.
For example, an enterprise may use a highly capable hosted model for difficult analysis. It should still prepare for price, policy, or access changes because it cannot operate that exact model independently.
