Pingpong is a web review app. You ask one question. It runs through five models in sequence. The models run as Grok then Perplexity then ChatGPT then Gemini then Claude.
Each later model sees the original question and every earlier answer. It can challenge the premise. It can push back on a prior answer. You get a final answer. You can open each earlier pass.
What you put in
Start with one question you can check afterward. Add the context the models need. State the decision or output you want. Label assumptions and missing facts.
For the steps inside the app see running your first review.
What you get back
You see a final answer. You can inspect earlier passes for corrections or disagreements. Open cited sources. Check the facts. Check the units. Check the calculations yourself.
A completed run does not prove every claim is true. Models can agree on a wrong point. Keep the source documents nearby when the answer matters.
When a review helps
Use it when a second look can catch a weak claim before you act. Board packs. Strategy choices. Draft replies. Decision writeups. See when a review may help and how to frame a decision.
Limits
A model can miss the same mistake as the first pass. Agreement is not proof. Verify anything that affects money safety or a hard deadline against the original source.