Logo16x Eval

Effortlessly evaluate prompts and models

Iterate on prompts. Test different models. Find the best combo for your tasks.

Join AI builders and power users in running your own evaluations

Your personal workspace for prompt engineering

Manage your prompts, contexts, and models in one place, locally on your machine. Test out different combinations and use cases with a few clicks.

Prompt Evaluation

Model Evaluation

Evaluation Function

Human Rating

Experiment Management

Context Library

BYOK API Integrations

Custom Models

16x Eval screenshot

16x Eval Video Demo

Learn how 16x Eval works in this video demo.

16x Eval demo video
16x Evaluation screenshot

Run Evaluations across Multiple Models

Create new evaluations by specifying prompt, context and models. Multiple contexts will be combined together and added to the final prompt.

You can select multiple models to evaluate the same prompt and context in parallel.

Adjust advanced settings like prompt structure and temperature for more control over your evaluations.

View and Compare Evaluation Results

Analyze your evaluation results with comprehensive metrics. Add personal notes to annotate your results.

Compare results from different prompt variations and models in a friendly table format. Easily identify which combinations perform best for your specific use cases.

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16x Eval side-by-side comparison screenshot

Side-by-Side Results Comparison

Compare different results side-by-side with the details on the prompt, context and model. Evaluate responses and metrics to understand how different models handle your specific use cases.

Perfect for A/B testing prompts, comparing model performance, and making informed decisions about which model works best for your evaluation tasks.

Customizable Columns for Metrics

Tailor your evaluation table to your specific needs with customizable columns. Show or hide columns based on which metrics is most important to you.

For example, you can track input and output token statistics, prompt structure, evaluation function scores, price, cost, and throughput.

Organize and view your eval data in ways that make sense for your evaluation workflow.

16x Eval customizable columns for metrics
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Custom Evaluation Functions

Create custom evaluation criteria to automatically score AI model responses based on your specific requirements.

Define target strings that should be included and penalty strings that should be avoided. Responses are automatically scored based on your criteria.

All Prompts and Contexts in One Place

Import and manage both text and image contexts for your evaluations. Use the drag and drop interface to easily add new prompts and contexts or import them from files.

Organize your prompts and contexts into categories to make them easier to find, or archive them to keep them out of the way.

16x Eval screenshot
16x Eval screenshot

Organize Evaluations into Experiments

Group evaluations into experiments to organize and categorize your testing for different use cases (coding, writing, question answering, etc).

Experiments support categories, archiving, and linking with evaluation functions to automatically enable the right functions for your specific use case.

Compare Models with Benchmark Page

View and compare model performance at a glance across different categories of tasks with the benchmark page.


Select models and categories to create your own local benchmark for your own use cases.

16x Eval table view screenshot
16x Eval screenshot

Built-in Models and Custom Models

16x Eval has built-in support for top models from various providers like OpenAI, Anthropic, Google, DeepSeek, Azure OpenAI, and OpenRouter.

We also support any other providers that offers OpenAI API compatibility, such as locally running Ollama or Fireworks.

16x Eval is a BYOK (Bring Your Own Key) application. You'll need to provide your own API keys these providers to use the application.

16x Eval Use Cases

See how 16x Eval fits into your different use cases.

Coding Task Evaluation

Coding experiment with prompt to add a feature to a TODO app

Coding experiment with prompt to add a feature to a TODO app

Evaluate and compare AI models for coding tasks. Perfect for developers who want to assess the quality and accuracy of AI-generated code.

  • Compare multiple models
  • Test different prompts
  • Custom evaluation functions
  • Response rating system
  • Add notes to each response
  • Various token statistics

Writing Task Evaluation

Watch a video demo of writing task evaluation

16x Eval demo video
Writing experiment with prompt to write an AI timeline

Writing experiment with prompt to write an AI timeline

Compare AI models for writing tasks. Ideal for content creators, writers, and AI builders using AI-assisted workflows for writing.

  • Compare multiple models
  • Test different prompts
  • Highlight target text and penalty text
  • Writing statistics (words per sentence and paragraph)
  • Custom evaluation functions
  • Add notes to each response

Image Analysis Task Evaluation

Watch a video demo of image analysis task evaluation

16x Eval demo video
Image analysis experiment with prompt "Explain what happened in the image."

Image analysis experiment with prompt "Explain what happened in the image."

Evaluate AI models for image analysis tasks. Great for AI builders and researchers assessing how different AI models interpret and analyze visual content.

  • Visual content analysis
  • Multiple model comparison
  • Custom evaluation criteria
  • Response rating system

Download 16x Eval

Join AI builders and power users in running your own evaluations