July 2025: simple-evals will no longer be updated for new models or benchmark results. The repo will continue to host reference implementations for HealthBench, BrowseComp, and SimpleQA.

This repository contains a lightweight library for evaluating language models. We are open sourcing it so we can be transparent about the accuracy numbers we're publishing alongside our latest models.

Evals are sensitive to prompting, and there's significant variation in the formulations used in recent publications and libraries. Some use few-shot prompts or role playing prompts ("You are an expert software programmer..."). These approaches are carryovers from evaluating base models (rather than instruction/chat-tuned models) and from models that were worse at following instructions.

For this library, we are emphasizing the zero-shot, chain-of-thought setting, with simple instructions like "Solve the following multiple choice problem". We believe that this prompting technique is a better reflection of the models' performance in realistic usage.

We will not be actively maintaining this repository and monitoring PRs and Issues. In particular, we're not accepting new evals. Here are the changes we might accept.

• Bug fixes (hopefully not needed!)
• Adding adapters for new models
• Adding new rows to the table below with eval results, given new models and new system prompts.

This repository is NOT intended as a replacement for https://github.com/openai/evals, which is designed to be a comprehensive collection of a large number of evals.

This repository currently contains the following evals:

• MMLU: Measuring Massive Multitask Language Understanding, reference: https://arxiv.org/abs/2009.03300, https://github.com/hendrycks/test, MIT License
• MATH: Measuring Mathematical Problem Solving With the MATH Dataset, reference: https://arxiv.org/abs/2103.03874, https://github.com/hendrycks/math, MIT License
• GPQA: A Graduate-Level Google-Proof Q&A Benchmark, reference: https://arxiv.org/abs/2311.12022, https://github.com/idavidrein/gpqa/, MIT License
• DROP: A Reading Comprehension Benchmark Requiring Discrete Reasoning Over Paragraphs, reference: https://arxiv.org/abs/1903.00161, https://allenai.org/data/drop, Apache License 2.0
• MGSM: Multilingual Grade School Math Benchmark (MGSM), Language Models are Multilingual Chain-of-Thought Reasoners, reference: https://arxiv.org/abs/2210.03057, https://github.com/google-research/url-nlp, Creative Commons Attribution 4.0 International Public License (CC-BY)
• HumanEval: Evaluating Large Language Models Trained on Code, reference https://arxiv.org/abs/2107.03374, https://github.com/openai/human-eval, MIT License
• SimpleQA: Measuring short-form factuality in large language models, reference: https://openai.com/index/introducing-simpleqa, MIT License
• BrowseComp: A Simple Yet Challenging Benchmark for Browsing Agents, reference: https://openai.com/index/browsecomp, MIT License
• HealthBench: Evaluating Large Language Models Towards Improved Human Health, reference: https://openai.com/index/healthbench, MIT License

We have implemented sampling interfaces for the following language model APIs:

• OpenAI: https://platform.openai.com/docs/overview
• Claude: https://www.anthropic.com/api

Make sure to set the *_API_KEY environment variables before using these APIs.

Due to the optional dependencies, we're not providing a unified setup mechanism. Instead, we're providing instructions for each eval and sampler.

For HumanEval (python programming)

git clone https://github.com/openai/human-eval
pip install -e human-eval

For the OpenAI API:

pip install openai

For the Anthropic API:

pip install anthropic

python -m simple-evals.simple_evals --list-models

This will list all the models that you can evaluate.

To run the evaluations, you can use the following command:

python -m simple-evals.simple_evals --model <model_name> --examples <num_examples>

This will launch evaluations through the OpenAI API.

By contributing to evals, you are agreeing to make your evaluation logic and data under the same MIT license as this repository. You must have adequate rights to upload any data used in an eval. OpenAI reserves the right to use this data in future service improvements to our product. Contributions to OpenAI evals will be subject to our usual Usage Policies: https://platform.openai.com/docs/usage-policies.