---
title: Causal GPT-RL
emoji: 🤖
colorFrom: indigo
colorTo: green
sdk: static
pinned: false
---

# Causal GPT-RL

GPT-style transformers (GPT-2, Llama) running as RL policies in continuous-control environments.

```text
action → next state → next action      (RL rollouts)
token  → next token  → next token      (LLM generation)
```

Stable under self-generated rollouts — long-horizon control without the drift that has historically kept transformers from being usable as RL agents.

## Get started

```bash
pip install "causal-gpt-rl[hub,mujoco]"
```

```python
import gymnasium as gym
from causal_gpt_rl.inference import load_runner_from_hub, run_episodes

env = gym.make("Ant-v5")
runner = load_runner_from_hub(
    repo_id="ccnets/causal-gpt-rl",
    subfolder="ant-v5",
    device="cpu",
)
stats = run_episodes(env, runner, num_episodes=5, seed=0)
```

**Available bundles:** Ant-v5, HalfCheetah-v5, Walker2d-v5, Humanoid-v5

- **Code:** [github.com/ccnets-team/causal-gpt-rl](https://github.com/ccnets-team/causal-gpt-rl)
- **Training logs (W&B, public):** [wandb.ai/junhopark/Causal GPT-RL](https://wandb.ai/junhopark/Causal%20GPT-RL?nw)
- **Website:** [ccnets.org](https://ccnets.org)

Released under PolyForm Noncommercial 1.0.0.