Usually, you create a new conda environment with specific Python version.

Alternatively, you can activate the base and run conda install python=<your_python_version> to change the base's Python version.

If you just want to know the default Python version that comes with a specific version of Anaconda, you can go to the Anaconda release notes (https://www.anaconda.com/docs/getting-started/anaconda/release/2025.x ), the Python version is just next to the anaconda's version.