Hey, thanks for the detailed report. This isn’t a bug, it’s expected behavior. Right now on the Free plan without your own API key, the model picker is locked to Composer 2.5 Fast with a lock icon. That’s why Auto shows for a second when you open it, then switches back to Composer 2.5 Fast. That’s by design.
Main thing, the lock doesn’t disable AI. Composer 2.5 Fast is our own fast model, and it fully works on Free. On your account, requests are going through and usage is being counted normally, so AI features are available, just through this model.
The lock icon only means you can’t change the model to Auto or others unless you upgrade to Pro. If you need model selection, that’s on Pro.
Let me know if Composer 2.5 Fast actually stops responding or errors out. If it does, please send the Request ID right upper corner of the chat context menu > Copy Request ID and we’ll take a look.