---
license: apache-2.0
base_model: Qwen/Qwen2.5-1.5B
datasets: [openai/gsm8k]
pipeline_tag: text-generation
tags: [grpo, reinforcement-learning, nemo-rl, math]
---

# Qwen2.5-1.5B GRPO GSM8K

Qwen2.5-1.5B trained with GRPO using NVIDIA NeMo RL v0.7.0.

## Results

| Model | GSM8K test (pass@1) | Correct |
|---|---|---|
| Qwen/Qwen2.5-1.5B (base) | 35.03% | 462 / 1319 |
| This model | 73.84% | 974 / 1319 |

+38.8 points, 2.1x relative. Both models evaluated identically on the full
1319-problem GSM8K test split, greedy decoding, same prompt template.

## Training

- GRPO, 130 steps, 16 prompts x 8 generations (2,080 samples)
- Reward: binary exact-match on the answer inside boxed tags
- DTensor v2 trainer + vLLM generation, colocated
- 1x H100 80GB, ~3 hours
- lr 1e-6 AdamW, KL penalty 0.01, clip 0.2/0.2, seq len 1024

No human-written solutions. The model learned from a programmatic grader.

## Prompt format

Trained with this template and expects it at inference. A bare question without
the wrapper degrades results substantially.

    Think step-by-step to solve the following problem. Output your answer inside of \boxed{} tags.:
    {question}

    Let's think step-by-step