> ## 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.

# Agent Flex Tier

> Run o4-mini on the flex service tier with the OpenAIResponses model.

## Code

```python agent_flex_tier.py theme={null}
from agno.agent import Agent
from agno.models.openai import OpenAIResponses

agent = Agent(
    model=OpenAIResponses(id="o4-mini", service_tier="flex"),
    markdown=True,
)

agent.print_response("Share a 2 sentence horror story")
```

## Usage

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

**1. Set your API key**

```bash theme={null}
export OPENAI_API_KEY=xxx
```

**2. Install dependencies**

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

**3. Run Agent**

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

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


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.