[Feature] cookbook: hosted OpenAI-compatible customHost example

[cursor]

What Would You Like to See with the Gateway?

A cookbook row for a hosted OpenAI-compatible customHost, same pattern as cookbook/providers/nvidia.ipynb: provider: "openai" + custom_host pointing at the /v1 root.

PZERO is a live chat-completions host. Catalog is public: GET https://api.pzero.studio/v1/models. Default text id: deepseek-v4-flash. Prepaid Bearer key (pzero_…). Do not append /chat/completions to custom_host.

Python (Portkey client):

from portkey_ai import Portkey

portkey = Portkey(
    api_key="YOUR_PORTKEY_API_KEY",
    provider="openai",
    custom_host="https://api.pzero.studio/v1",
    Authorization="Bearer pzero_…",
)

OpenAI SDK through the gateway (same headers as the NVIDIA cookbook):

from openai import OpenAI
from portkey_ai import PORTKEY_GATEWAY_URL, createHeaders

client = OpenAI(
    api_key="pzero_…",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        provider="openai",
        custom_host="https://api.pzero.studio/v1",
        api_key="YOUR_PORTKEY_API_KEY",
    ),
)

completion = client.chat.completions.create(
    model="deepseek-v4-flash",
    messages=[{"role": "user", "content": "ping"}],
)

No first-party pzero provider asked. customHost already works; this is a copy-paste cookbook like NVIDIA, not a new gateway integration.

Context for your Request

Users who already run Portkey as an OpenAI-compatible proxy need a hosted example that is not NVIDIA NIM and not localhost. The NVIDIA notebook is the existing pattern.

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