> ## 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.

# Dynamic Model Router

> Configure an OpenRouter agent with an ordered fallback model list so a request failing on rate limits, timeouts, or overload retries on the next model.

Use dynamic model router with OpenRouter.

```python dynamic_model_router.py theme={null}
"""
This example demonstrates how to use dynamic model router with OpenRouter.

Dynamic models provide automatic failover when the primary model encounters:
- Rate limits
- Timeouts
- Unavailability
- Model overload

OpenRouter will automatically try the models defined in order until one succeeds.
"""

from agno.agent import Agent
from agno.models.openrouter import OpenRouter

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

# Create an agent with dynamic models
# If the primary model fails, OpenRouter will automatically try the models defined in order
agent = Agent(
    model=OpenRouter(
        id="anthropic/claude-sonnet-4",  # Primary model
        models=[
            "deepseek/deepseek-r1",  # First fallback model
            "openai/gpt-5.6-luna",  # Second fallback model
        ],
    ),
    markdown=True,
)

# Run the agent - it will use the primary model if available,
# or automatically fall back to alternative models if needed
agent.print_response("Write a short poem about resilience and backup plans")

# You can also check which model was actually used in the response
# by examining the response metadata (if available from OpenRouter)

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    pass
```

## Run the Example

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

**1. Install dependencies**

```bash theme={null}
uv pip install -U agno openai
```

**2. Export your OpenRouter API key**

```bash Mac/Linux theme={null}
export OPENROUTER_API_KEY="your_openrouter_api_key_here"
```

```bash Windows theme={null}
$Env:OPENROUTER_API_KEY="your_openrouter_api_key_here"
```

**3. Run the example**

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

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

Full source: [cookbook/90\_models/openrouter/chat/dynamic\_model\_router.py](https://github.com/agno-agi/agno/blob/v3.0.4/cookbook/90_models/openrouter/chat/dynamic_model_router.py)


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