For inference you can use either prediction methods from full packages:

• Python package: several variants of predict* methods of CatBoost* classes.
• R package: catboost.predict
• CatBoost for Apache Spark: transform methods of CatBoost*Model classes
• CLI: calc mode

Or use dedicated inference-only CatBoost libraries for

• C
• C++
• JVM
• Rust
• .NET
• Node.js

Or export to one of the following model formats:

• CoreML
• ONNX
• PMML

Or export models as code in:

• C++
• Python

See the documentation.