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@@ -51,6 +51,20 @@ The Gemini API provides a free tier with [100 requests per day](https://ai.googl 3. (Optionally) Upgrade your Gemini API project to a paid plan on the API key page (will automatically unlock [Tier 1 rate limits](https://ai.google.dev/gemini-api/docs/rate-limits#tier-1)) +### Use a Vertex AI API key: + +The Vertex AI provides [free tier](https://cloud.google.com/vertex-ai/generative-ai/docs/start/express-mode/overview) using express mode for Gemini 2.5 Pro, control over which model you use, and access to higher rate limits with a billing account: + +1. Generate a key from [Google Cloud](https://cloud.google.com/vertex-ai/generative-ai/docs/start/api-keys). +2. Set it as an environment variable in your terminal. Replace `YOUR_API_KEY` with your generated key and set GOOGLE_GENAI_USE_VERTEXAI to true + + ```bash + export GOOGLE_API_KEY="YOUR_API_KEY" + export GOOGLE_GENAI_USE_VERTEXAI=true + ``` + +3. (Optionally) Add a billing account on your project to get access to [higher usage limits](https://cloud.google.com/vertex-ai/generative-ai/docs/quotas) + For other authentication methods, including Google Workspace accounts, see the [authentication](./docs/cli/authentication.md) guide. ## Examples |