TensorZero works with the OpenAI SDK out of the box:

```

from openai import OpenAI

# Point the client to the TensorZero Gateway

client = OpenAI(base_url="http://localhost:3000/openai/v1", api_key="not-used")

response = client.chat.completions.create(

    # Call any model provider (or TensorZero function)

    model="tensorzero::model_name::anthropic::claude-sonnet-4-6",

    messages=[

        {

            "role": "user",

            "content": "Share a fun fact about TensorZero.",

        }

    ],

)

```

You can layer additional features only as needed (fallbacks, templates, A/B testing, etc).