> ## 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.

# Future Life Storytelling

> Compare gpt-4o built-in chain-of-thought against a deepseek-reasoner reasoning model on a 500,000-year sci-fi short story, streaming full reasoning for both.

Demonstrates DeepSeek-backed reasoning for speculative writing.

```python life_in_500000_years.py theme={null}
"""
Future Life Storytelling
========================

Demonstrates DeepSeek-backed reasoning for speculative writing.
"""

from agno.agent import Agent
from agno.models.deepseek import DeepSeek
from agno.models.openai import OpenAIResponses

# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
task = "Write a short story about life in 500000 years"

agent = Agent(
    model=OpenAIResponses(id="gpt-5.6"),
    reasoning_model=DeepSeek(id="deepseek-reasoner"),
    markdown=True,
)

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    agent.print_response(task, stream=True, show_full_reasoning=True)
```

## Run the Example

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

**1. Install dependencies**

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

**2. Export your API keys**

```bash Mac/Linux theme={null}
export DEEPSEEK_API_KEY="your_deepseek_api_key_here"
export OPENAI_API_KEY="your_openai_api_key_here"
```

```bash Windows theme={null}
$Env:DEEPSEEK_API_KEY="your_deepseek_api_key_here"
$Env:OPENAI_API_KEY="your_openai_api_key_here"
```

**3. Run the example**

Save the code above as `life_in_500000_years.py`, then run:

```bash theme={null}
python life_in_500000_years.py
```

Full source: [cookbook/10\_reasoning/agents/life\_in\_500000\_years.py](https://github.com/agno-agi/agno/blob/v3.0.4/cookbook/10_reasoning/agents/life_in_500000_years.py)


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