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StableLM Zephyr 3B

Please note: For commercial use, please refer to https://stability.ai/membership.

Model Description

StableLM Zephyr 3B is a 3 billion parameter instruction tuned inspired by HugginFaceH4's Zephyr 7B training pipeline this model was trained on a mix of publicly available datasets, synthetic datasets using Direct Preference Optimization (DPO), evaluation for this model based on MT Bench and Alpaca Benchmark


StableLM Zephyr 3B uses the following instruction format:

List 3 synonyms for the word "tiny"<|endoftext|>
1. Dwarf
2. Little
3. Petite<|endoftext|>

This format is also available through the tokenizer's apply_chat_template method:

from transformers import AutoModelForCausalLM, AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained('stabilityai/stablelm-zephyr-3b')
model = AutoModelForCausalLM.from_pretrained(

prompt = [{'role': 'user', 'content': 'List 3 synonyms for the word "tiny"'}]
inputs = tokenizer.apply_chat_template(

tokens = model.generate(

print(tokenizer.decode(tokens[0], skip_special_tokens=False))

You can also see how to run a performance optimized version of this model here using OpenVINO from Intel.

Model Details

Training Dataset

The dataset is comprised of a mixture of open datasets large-scale datasets available on the HuggingFace Hub:

  1. SFT Datasets
  • HuggingFaceH4/ultrachat_200k
  • meta-math/MetaMathQA
  • WizardLM/WizardLM_evol_instruct_V2_196k
  • Open-Orca/SlimOrca
  1. Preference Datasets:
  • HuggingFaceH4/ultrafeedback_binarized
  • Intel/orca_dpo_pairs


MT-Bench and Alpaca Bench

Model Size Alignment MT-Bench (score) AlpacaEval (win rate %)
StableLM Zephyr 3B πŸͺ 3B DPO 6.64 76.00
StableLM Zephyr (SFT only) 3B SFT 6.04 71.15
Capybara v1.9 3B dSFT 5.94 -
MPT-Chat 7B dSFT 5.42 -
Xwin-LM v0.1 7B dPPO 6.19 87.83
Mistral-Instruct v0.1 7B - 6.84 -
Zephyr-7b-Ξ± 7B dDPO 6.88 -
Zephyr-7b-Ξ² 7B dDPO 7.34 90.60
Falcon-Instruct 40B dSFT 5.17 45.71
Guanaco 65B SFT 6.41 71.80
Llama2-Chat 70B RLHF 6.86 92.66
Vicuna v1.3 33B dSFT 7.12 88.99
WizardLM v1.0 70B dSFT 7.71 -
Xwin-LM v0.1 70B dPPO - 95.57
GPT-3.5-turbo - RLHF 7.94 89.37
Claude 2 - RLHF 8.06 91.36
GPT-4 - RLHF 8.99 95.28

Other benchmarks:

Task Value
ARC (25-shot) 47.0
HellaSwag (10-shot) 74.2
MMLU (5-shot) 46.3
TruthfulQA (0-shot) 46.5
Winogrande (5-shot) 65.5
GSM8K (5-shot) 42.3
BigBench (Avg) 35.26
AGI Benchmark (Avg) 33.23

Training Infrastructure

  • Hardware: StableLM Zephyr 3B was trained on the Stability AI cluster across 8 nodes with 8 A100 80GBs GPUs for each nodes.
  • Code Base: We use our internal script for SFT steps and used HuggingFace Alignment Handbook script for DPO training.

Commitment to Ethical AI

In line with our responsibility towards ethical AI development, StableLM Zephyr 3B is released with a focus on ensuring safety, reliability, and appropriateness in its applications. To this end, we have evaluated StableLM Zephyr 3B on 488 malicious prompts and used standard protocols to assess the harmfulness of its outputs. Compared to Zephyr-7b-Ξ², StableLM Zephyr 3B reduces the number of harmful outputs as assessed by GPT-4 by 55. Additionally, we performed an internal red teaming event targeting the following abuse areas:

  • Self-Harm Methods: (Suicide Methods, Encouragement of Self-Harm, Methods and encouragement of Eating Disorders)
  • Misinformation: (Health, Conspiracy Theories, Social Unrest/Conflict, Political Misinformation, & Climate change)
  • Hate Speech: (Race, Stereotypes, Immigrants, Gender, Personally Identifiable Information such as Social security numbers, Full names, ID numbers, Email addresses, and telephone numbers)

We have incorporated the findings of our malicious prompts evaluation and red teaming event into our release. Users are encouraged to fine-tune and evaluate the model to suit their specific needs, considering the potential biases and limitations found in StableLM Zephyr 3B and inherent in other LLM models.

Use and Limitations

Intended Use

The model is intended to be used as a foundational base model for application-specific fine-tuning. Developers must evaluate and fine-tune the model for safe performance in downstream applications. For commercial use, please refer to https://stability.ai/membership.

Limitations and Bias

​ This model is not trained against adversarial inputs. We strongly recommend pairing this model with an input and output classifier to prevent harmful responses.

Through our internal red teaming, we discovered that while the model will not output harmful information if not prompted to do so, it is willing to output potentially harmful outputs or misinformation when the user requests it. Using this model will require guardrails around your inputs and outputs to ensure that any outputs returned are not misinformation or harmful. Additionally, as each use case is unique, we recommend running your own suite of tests to ensure proper performance of this model. Finally, do not use the models if they are unsuitable for your application, or for any applications that may cause deliberate or unintentional harm to others.

Open LLM Leaderboard Evaluation Results

Detailed results can be found here

Metric Value
Avg. 53.43
AI2 Reasoning Challenge (25-Shot) 46.08
HellaSwag (10-Shot) 74.16
MMLU (5-Shot) 46.17
TruthfulQA (0-shot) 46.49
Winogrande (5-shot) 65.51
GSM8k (5-shot) 42.15
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Evaluation results