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references/model-selection.md

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+## Model selection procedure
+
+- Open model selector with:
+  /models
+
+- Select the provider requested by the user
+
+### Auth-based providers (e.g. OpenAI)
+
+- Opencode will generate a login URL
+- Copy the URL exactly
+- Send it to the user
+- Wait for confirmation before continuing
+
+Never assume authentication is complete.