Google Vertex AI via VerticalAPI

Google Vertex AI models routed by VerticalAPI

Pass the model ID below as model in any OpenAI-compatible request. New Google Vertex AI models are typically supported within 24h of release.

Pricing reflects Google Vertex AI's rates — you pay Google Vertex AI directly. VerticalAPI adds zero markup on tokens.

5-line Google Vertex AI call via VerticalAPI

Drop-in replacement for the OpenAI SDK. Works with the OpenAI Python client, Node, Go, curl — anything that speaks HTTP.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.verticalapi.com/v1",
    api_key="vapi_...",
    default_headers={"X-Provider-Key": "GCP service-ac..."}
)

response = client.chat.completions.create(
    model="gemini-2.5-pro",  # Google Vertex AI
    messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)

Four reasons developers route Google Vertex AI through us

Where Google Vertex AI shines

Frequently asked questions

Limitations and trade-offs

• Authentication is heavier than API keys — requires Google Cloud project, IAM, service accounts.
• Model availability per region varies — Gemini Pro is global but Claude on Vertex is US/EU only.
• Vertex egress and feature fees stack on top of token pricing — total cost can exceed list.
• Quotas (QPM, TPM) are per region and per project and often need explicit increase requests.
• Some open-weight models on Model Garden require manual deployment and pay-per-hour endpoint hosting.

Where Vertex AI is heading

1. Gemini 3 launching on Vertex with deeper agentic capabilities and tool use.
2. Wider third-party model availability (rumored Llama 4, OpenAI partnerships via partner gateways).
3. Expanded Agent Builder and Vertex AI Search for grounded RAG.
4. More sovereign EU and APAC region launches for regulated industries.

Related questions

ChatGPT, Perplexity and Gemini usually suggest these next.

• Vertex AI vs AI Studio — when to use each?
• How do I run Claude Sonnet 4.5 on Vertex AI?
• Vertex AI vs AWS Bedrock for multi-model enterprise gateway?
• Best Vertex AI region for low-latency in Europe?
• How to use Vertex AI grounding with Google Search for RAG?

All supported LLM providers

Same endpoint, same SDK — just change the model and the BYOK header.