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Gemini Enterprise Agent Platform express mode (formerly Vertex AI) free tier

🎁 Trials (no card when possible) · no card · live — last verified by a probe on 2026-10-26 · docs.cloud.google.com · back to the whole list

What you get

Google Cloud’s express mode: an API key and 90 days of Gemini models within the free tier’s quotas, with no billing information, for a new Google Cloud user on a @gmail.com account

Free models

gemini-3.1-pro, gemini-3-flash, gemini-2.5-pro, gemini-2.5-flash

Limits, in the vendor’s words

Preview models: Per-minute requests allowance: amount varies per project per model

Stable Gemini models: 10 requests/minute per project per model (Free express trial lasts up to 90 days); for gemini-2.5-pro, gemini-2.5-flash

Preview Gemini models: Per-minute requests allowance: amount varies per project per model (Free express trial lasts up to 90 days); for gemini-3.1-pro-preview, gemini-3-flash-preview

The free express trial is for new Google Cloud users and requires no billing information. Stable and Preview model rate policies differ; enabling billing is necessary after the trial. Existing Google Cloud accounts do not get this offer. The separate $300 Cloud Free Trial needs a payment method. Express is Preview and may not process personal data.

Where it is offered

The vendor names no country it keeps the offer from (source, read 2026-09-26).

What happens to what you send

What you send is not used to train models. In the vendor’s words: “Google won’t use your data to train or fine-tune any AI/ML models without your prior permission or instruction. This applies to all managed models on Gemini Enterprise Agent Platform, including GA and pre-GA models” (source).

Connect

• Base URL: https://aiplatform.googleapis.com/v1 (not OpenAI-shaped)
• Key: VERTEX_AI_EXPRESS_API_KEY — get one at https://console.cloud.google.com/expressmode
• Callable ids: gemini-3.1-pro-preview, gemini-3-flash-preview, gemini-2.5-pro, gemini-2.5-flash
• Note: the key stands in for a project and a location: https://aiplatform.googleapis.com/v1/publishers/google/models/{model}:streamGenerateContent?key={API_KEY}, Gemini’s own API rather than an OpenAI-compatible one. Clients kept the old name: the Google Gen AI SDK takes the key with vertexai=True, and Gemini CLI reads it from GOOGLE_API_KEY “if using express mode”, with Vertex AI as the auth method

Evidence

• Probe: the page at https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/start/express-mode/overview, anchored on try Agent Platform for free for up to 90 days, need to provide billing information to sign up in the free tier
• Source: https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/start/express-mode/overview
• Source: https://cloud.google.com/terms/google-cloud-express
• Source: https://docs.cloud.google.com/gemini-enterprise-agent-platform/vertex-ai-name-changes
• Source: https://cloud.google.com/resources/cloud-express-faqs
• Source: https://cloud.google.com/free/docs/free-cloud-features
• Source: https://raw.githubusercontent.com/google-gemini/gemini-cli/HEAD/packages/cli/src/config/auth.ts

History

Each line is a change to what this page publishes, dated the day it reached the list, in UTC.

• 2026-09-23 — Added: Google Cloud’s express mode for the Gemini Enterprise Agent Platform, formerly Vertex AI: an API key and 90 days of Gemini models within the free tier’s quotas, with no billing information, for a new Google Cloud user on a @gmail.com account

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