PromptPerf
PromptPerf · Coding
PromptPerf is an AI prompt testing platform that runs your real prompts across 100+ models like GPT, Claude and Gemini, then shows which one answers best for your task.
About PromptPerf
What Is PromptPerf
PromptPerf is a web tool for anyone who uses AI models for work and wants to stop picking one by reputation. You write an example prompt, describe what a good answer looks like, and PromptPerf runs that prompt on several models at once. Each response gets a match score against your expected answer, so you see a ranked winner instead of a guess.
The core idea is that generic benchmarks don't tell you much about your own use case. A model that tops a public leaderboard might trail a cheaper option on your specific task, and this prompt evaluation platform measures that difference directly on your prompts. It also tracks cost, so you can weigh a small accuracy gap against the price of each model.
The main limitation is scope. PromptPerf is a testing and comparison layer, not a place to build or ship an AI app. It works with hosted models that it connects to, and the deeper features like team tools and advanced analytics sit on the higher tiers.
Getting Started
- Open the evaluator at promptperf.dev and add at least one example: your prompt plus the answer you'd expect from a good model.
- Add more examples or bulk upload a set so the test covers different inputs, not just one happy path.
- Pick two to four models to compare, or let the tool suggest a shortlist, and adjust creativity and pass score if you want stricter or looser matching.
- Run the test and read the results, which rank each model by match score and show the relative cost of each option.
- Save the test and re-run it later to catch when a provider update changes how a model handles your prompts.
Product Information
A quick look at PromptPerf's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Solo developers and small teams without a data scientist
- Product and support leads choosing a model for a live feature
- Cost-conscious builders watching their AI bill
Tasks
- Picking a model before building on it
- Checking whether a prompt still works after a model update
- Comparing free and paid options
Scenarios
- Choosing between ChatGPT, Claude and Gemini for one job
- Early prototyping where requirements shift quickly
- Budget reviews before scaling an AI feature
Key features
Multi Model Prompt Testing
This LLM comparison tool lets you compare two to four models in a single run, including GPT, Claude, Gemini and free options from DeepSeek and Meta. Each model answers the same examples, so the comparison holds the input constant, which keeps prompt performance testing fair across options.
Match Score Against Your Expected Answer
Instead of judging output by feel, you describe what a good answer looks like and PromptPerf scores each response against it. A pass score threshold lets you set how strict that matching should be.
Cost Visibility Next to Accuracy
Results show the relative price of each model alongside its score. This makes the accuracy versus cost trade explicit, which matters when a small gap between two models maps to a large difference in spend.
Saved Tests and Re-runs
You can store a test and run it again whenever you want. This turns a one-off comparison into a repeatable check that catches regressions after a provider updates a model.
Bulk Example Upload
Rather than testing a single prompt, you can load a batch of examples so a test covers many inputs. The free plan allows up to five examples per test, and paid plans remove that cap.
No Code and No API Setup
PromptPerf includes the API keys needed to reach the models it supports, so you don't wire up your own accounts or write scripts. You paste a prompt, pick models and read the results.
Pros and cons
Pros
- Tests your own prompts rather than relying on generic public benchmarks.
- Surfaces cost data next to accuracy, so cheaper models get a fair look.
- Takes the guesswork out of finding the best AI model for your task, since scores come from your own examples.
- Free tier is usable without a signup for quick comparisons, and a free account lifts limits.
- Saved tests make it easy to re-check prompts after a model update.
- No coding or API setup, which lowers the barrier for non engineers.
Cons
- It's a comparison and AI prompt testing tool only, so you can't build or deploy an app inside it.
- Scoring depends on the expected answer you write, so weak examples produce weak signals.
- Team features and advanced analytics aren't available on the cheapest tiers.
Frequently asked questions
PromptPerf runs your prompts across 100+ AI models and scores how well each response matches the answer you expected. It then ranks the models so you can pick the one that performs best for your specific task.
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