Amazon Q plugin for IntelliJ IDEA: Model unavailable

This is a known issue affecting Amazon Q Developer with Claude 4 model in IntelliJ IDEA. Many users are experiencing the "Model Unavailable" message with Claude 4, indicating that the model is experiencing high load. This appears to be related to service capacity challenges that AWS is currently facing.

The issue is likely due to high demand following recent launches, which has strained the service capacity. AWS is aware of these issues and is working on stabilizing the service and provisioning additional capacity, though there's no specific timeline for when these issues will be fully resolved.

In the meantime, you can try these workarounds:

1. Switch to Claude 3.7 as a fallback model (though some users report interruptions with this model as well)
2. Run the q doctor command to diagnose common issues with your Amazon Q installation
3. Ensure you're properly authenticated by running q login if needed
4. Break down your prompts into smaller, less complex inputs
5. Check for any network connectivity issues, particularly with port 8443 which Amazon Q uses

If you're using JetBrains 2023.2.0 specifically, note that Amazon Q Developer has known compatibility issues with that exact version. In that case, upgrading to JetBrains 2023.2.1 or newer would be recommended.
Sources
Seeking Help: Claude 4 Unavailable & Claude 3.7 Frequent Interruptions on Amazon Q Developer | AWS re:Post
Troubleshooting the AWS Toolkit for JetBrains - AWS Toolkit for JetBrains
Amazon Q is having trouble responding right now: | AWS re:Post