Simple-Evals
Evaluation tools for language models by OpenAI.
Pricing
Free tier
Flat rate
Adoption
→StableLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is Simple-Evals?
Simple-Evals provides a set of evaluation tools and utilities to assess the performance of language models. It is designed to help developers understand how well their models are performing under various conditions, ensuring reliable and accurate outputs.
Key differentiator
“Simple-Evals stands out by offering a comprehensive and flexible framework for evaluating language models, making it easier to integrate into existing development workflows without the need for extensive setup.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
API requires Python-specific patterns, TypeScript SDK is community-maintained
v0.1 to v0.2 migration required rewriting chain definitions
Detailed guides and examples are lacking, making it hard to implement complex evaluations
Evaluation processes can become slow when dealing with very large datasets or models
Fit analysis
Who is it for?
✓ Best for
Developers who need to evaluate the robustness and accuracy of their custom-trained language models.
Teams working on natural language processing projects requiring rigorous testing frameworks.
Researchers comparing different language models for specific tasks.
✕ Not a fit for
Projects that require real-time evaluation capabilities as Simple-Evals is designed for batch processing.
Use cases where a graphical user interface (GUI) is preferred over command-line or script-based evaluations.
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Works well with
Next step
Get Started with Simple-Evals
Step-by-step setup guide with code examples and common gotchas.