Model ID

gemini-2.5-flash-lite

Use It in Python

from openai import OpenAI

client = OpenAI(
    base_url="https://aiplatform.googleapis.com/v1/publishers/google/models/MODEL_ID:generateContent",
    api_key="YOUR_API_KEY",
)

response = client.chat.completions.create(
    model="gemini-2.5-flash-lite",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

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Free Tier Limits (Google Vertex AI express mode (Gemini Enterprise Agent Platform))

Rate Limit
Gemini 2.5 models: 10 Requests per minute; Gemini 3 models: dynamic limits
Daily Limit
Free-tier quotas (per model)