Starter plan, $49/mo
Compare up to 5 models on your actual prompts. Get started in minutes.
Get startedCompare any model on your actual prompt
StarterFire your prompt at up to 5 models simultaneously. Get cost, latency, and quality score side by side in seconds. Every result saved to your history.
- All major providers: OpenAI, Anthropic, Google, Meta, xAI, Groq, and more
- Full response text for every model in the result drawer
- Heuristic quality scoring out of the box – no rubric setup required
- Cost per call shown in real time for every model in the run
See the full model registry at /models.
| Model | Quality | Cost | Latency |
|---|---|---|---|
| claude-opus-5 | 94 | $0.01821 | 3240ms |
| gpt-4o-mini | 91 | $0.00091 | 980ms |
| llama-3.3-70b | 90 | $0.00048 | 1120ms |
Test with your production system prompt
StarterSave your system prompt once and attach it to any comparison. A/B test two versions side by side and see the cost and quality difference directly. System prompts are a cost lever most teams never measure.
- Save up to 1 system prompt
- Attach to any comparison run
- A/B test two prompts on the same models to find the cheaper, better version
| Model | Quality | Cost | Latency |
|---|---|---|---|
| gpt-4o-mini | 91 | $0.00091 | 980ms |
| llama-3.3-70b | 90 | $0.00048 | 1120ms |
| Model | Quality | Cost | Latency |
|---|---|---|---|
| gpt-4o-mini | 93 | $0.00061 | 620ms |
| llama-3.3-70b | 92 | $0.00031 | 710ms |
A defensible model choice -- with data
StarterRun your actual prompts against the models you are considering. See which one delivers the quality you need at the lowest cost. The result is a number you can act on and show to a stakeholder.
Starter includes $12/mo in model credits – enough to run hundreds of comparisons on typical prompts before you need a top-up.
When you are ready to set a quality bar and track it over time, Pro adds rubric evaluation and scheduled benchmarks.
Run your actual prompts against the models you are considering. See which one delivers the quality you need at the lowest cost. The result is a number you can act on and show to a stakeholder.
Starter includes $12/mo in model credits – enough to run hundreds of comparisons on typical prompts before you need a top-up.
When you are ready to set a quality bar and track it over time, Pro adds rubric evaluation and scheduled benchmarks.
Will this work with my stack? Yes. You bring your prompt – LLM Prover handles the model calls. No API keys to manage, no SDK to install. If you can paste a prompt, you can run a comparison.
When you would move to Pro: If you need to score outputs against a rubric, track quality over time with scheduled benchmarks, or test models against your own knowledge base, Pro is the next step.
Ready to find your model?
Get started for $49/mo. Your first comparison takes less than a minute.