Last refreshed 2026-05-11. Next refresh: weekly.
Why use Gemini 3.1 Pro Preview on GCP Vertex AI?
GCP Vertex AI offers Gemini 3.1 Pro Preview with pay-as-you-go pricing at $2.00/1M input tokens. Vertex AI is Google Cloud's managed AI platform, offering access to Gemini models and hundreds of partner models alongside tools for fine-tuning, grounding, vector search, and end-to-end MLOps pipelines.
Compare Gemini 3.1 Pro Preview across 4 providers to find the best fit for your use caseSetup recipe
Python + curlpip install google-cloud-aiplatformexport GOOGLE_CLOUD_PROJECT=...import os
import vertexai
from vertexai.generative_models import GenerativeModel
vertexai.init(project=os.environ["GOOGLE_CLOUD_PROJECT"], location="us-central1")gemini-3.1-pro-previewRequest example
import os
import vertexai
from vertexai.generative_models import GenerativeModel
# Reads GOOGLE_CLOUD_PROJECT from env; authenticates via Application Default Credentials
vertexai.init(project=os.environ["GOOGLE_CLOUD_PROJECT"], location="us-central1")
model = GenerativeModel("gemini-3.1-pro-preview")
response = model.generate_content("Hello")
print(response.text)Gotchas
- For Google-published models use the model name directly, e.g. "gemini-2.0-flash-001". For third-party publishers (Anthropic, Meta, etc.) use the full publisher path, e.g. "publishers/anthropic/models/claude-3-5-sonnet-v2@20241022".
- The examples expect GOOGLE_CLOUD_PROJECT; rename it only if your application config maps the new variable.
Compare Gemini 3.1 Pro Preview Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Google AI Studio | $2.00 | $12.00 |
| GCP Vertex AI | $2.00 | $12.00 |
| OpenRouter | $2.00 | $12.00 |
| Replicate API | $2.00 | $12.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $2.00 |
| Output tokens | $12.00 |
Capabilities
About Gemini 3.1 Pro Preview
Google: Gemini 3.1 Pro Preview available via OpenRouter. Pricing: $2/1M input, $12/1M output.
FAQ
What does Gemini 3.1 Pro Preview cost on GCP Vertex AI?
On GCP Vertex AI, Gemini 3.1 Pro Preview costs $2.00 per 1M input tokens and $12.00 per 1M output tokens.
What is the context window for Gemini 3.1 Pro Preview on GCP Vertex AI?
Gemini 3.1 Pro Preview supports a 1,000,000 token context window on GCP Vertex AI.
How does GCP Vertex AI compare to other Gemini 3.1 Pro Preview providers?
Gemini 3.1 Pro Preview is available from 4 providers. The cheapest input pricing is $2.00/1M tokens from Google AI Studio.
Who created Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview was created by Google DeepMind as part of the Gemini 3.1 model family.
Is Gemini 3.1 Pro Preview open source?
Gemini 3.1 Pro Preview's open source status is unknown in the seed data.