Vibes LLM - can these be selected and if so how?

In Agentforce Vibes, the model is generally chosen from within the chat panel of the IDE rather than in an org-wide setup page. Look near the prompt box for a model selector or dropdown, and pick from the models listed there. The choices depend on what Salesforce has enabled for your org and release, so the list can differ between orgs and may change over time. If you don't see a selector, check that the extension is up to date, that Agentforce Vibes is enabled, and that your admin has granted the relevant access to your user. Bring-your-own-model options, where offered, are typically configured by an admin, so ask them if the default is all you see. The release notes list current model availability.