Cesar Garcia 94055741d4 docs: clarify Gemini vs Vertex AI model prefix behavior (#19443) ...

Add documentation explaining the difference between model formats:
- `gemini/model` → Gemini API (simple API key)
- `vertex_ai/model` → Vertex AI (GCP credentials)
- `model` (no prefix) → defaults to Vertex AI

This addresses user confusion when models without prefix require
GCP authentication instead of simple API key auth.

Ref #8424

2026-01-20 15:22:52 -08:00

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docs: clarify Gemini vs Vertex AI model prefix behavior (#19443)

2026-01-20 15:22:52 -08:00