> ## Documentation Index
> Fetch the complete documentation index at: https://agno-v2.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Vertex AI Basic

> Run Claude Sonnet 4 on Vertex AI with sync, streaming, and async calls.

```python basic.py theme={null}
"""
Vertexai Basic
==============

Cookbook example for `vertexai/claude/basic.py`.
"""

from agno.agent import Agent, RunOutput  # noqa
from agno.models.vertexai.claude import Claude
import asyncio

# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------

agent = Agent(model=Claude(id="claude-sonnet-4@20250514"), markdown=True)

# Get the response in a variable
# run: RunOutput = agent.run("Share a 2 sentence horror story")
# print(run.content)

# Print the response in the terminal

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    # --- Sync ---
    agent.print_response("Share a 2 sentence horror story")

    # --- Sync + Streaming ---
    agent.print_response("Share a 2 sentence horror story", stream=True)

    # --- Async ---
    asyncio.run(agent.aprint_response("Share a 2 sentence horror story"))

    # --- Async + Streaming ---
    asyncio.run(agent.aprint_response("Share a 2 sentence horror story", stream=True))
```

## Run the Example

<Snippet file="create-venv-step.mdx" />

**1. Install dependencies**

```bash theme={null}
uv pip install -U agno "anthropic[vertex]"
```

**2. Export environment variables**

```bash Mac/Linux theme={null}
export ANTHROPIC_VERTEX_PROJECT_ID="your_anthropic_vertex_project_id_here"
export CLOUD_ML_REGION="your_cloud_ml_region_here"
```

```bash Windows theme={null}
$Env:ANTHROPIC_VERTEX_PROJECT_ID="your_anthropic_vertex_project_id_here"
$Env:CLOUD_ML_REGION="your_cloud_ml_region_here"
```

**3. Authenticate with Google Cloud**

Sign in with Application Default Credentials:

```bash theme={null}
gcloud auth application-default login
```

**4. Run the example**

Save the code above as `basic.py`, then run:

```bash theme={null}
python basic.py
```

Full source: [cookbook/90\_models/vertexai/claude/basic.py](https://github.com/agno-agi/agno/blob/v3.0.4/cookbook/90_models/vertexai/claude/basic.py)


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