CatChat is capable of replacing your Claude Models with its own, ensuring even when you are using the Claude Desktop application you are able to still run on MSUs models.

 

Application Setup

  1. Ensure that you have the Claude desktop application on the device you want to use.
  2. Navigate to your application bar and find the "Help" tab, and select "Troubleshooting", then "Enable Developer Mode..." Enabling this will allow you to add our gateway. Your claude app will need to restart after this.
    Select Help > Troubleshooting > Enable Developer Mode
  3. Once Developer Mode is enabled. You will see it as an option in your application bar. If you click on Developer, you will see an option to "Configure Third-Party Inference..." Click on that, and it will open up a new window.
    Developer > Configure Third-Party Inference...
  4. When the window opens you will see several configuration options, and we only need to set a few. First you will set the "Credential Kind" to 'Static API Key'. Then you will set "Gateway base URL" to 'https://catchat-api.msu.montana.edu/'.
    Claude App config with Named fields filled in
  5. After that you need to go to CatChat Access where you will Login with your MSU Account, navigate to API Keys and click "+ Free Key" to generate a key. You will go back to your Claude app, and put that key into the "Gateway API key" field. When that is populated, you can click the "Test Connection" button in the top right hand corner, and make sure that your configuration is working.
    Claude App config with Named fields filled in
  6. After your connection has been established, scroll down to the "Models" section, Where you will turn on "Use 1M wherever its available" After that click "Apply Changes" this will have your claude application restart to pick up the changes, and after that you will be chatting with the CatChat Models. The model aliases are shown in the table below as well.
    Showing use 1M wherever its available turned on with a glowing Apply Changes Button

 

Model Alias Chart

Claude Model CatChat Model
claude-opus-4 qwen3.8-27b
claude-haiku-4.5 gemma4-31b
claude-haiku-3.5 gpt-oss:120b