Ask every AI at once. Get one answer.
One question goes to up to 6 AIs at once: ChatGPT, Claude, Gemini, DeepSeek, Grok and a Wildcard seat from OpenRouter. They answer side by side, then challenge each other’s reasoning, and a synthesis builds one answer from the strongest points, showing where they disagreed. Bring your own API keys and pay each provider directly, no markup. Try the free preview first: 3 questions a day, no account.
ChatGPT
Claude
Gemini
DeepSeek
Grok
WildcardIs a daily multivitamin worth taking if you eat reasonably well?
GrokGrok 4.3No, a daily multivitamin is generally not worth taking if you eat a reasonably well-balanced diet.[](http://hopkinsmedicine.org/health/wellness-and-prevention/is-there-really-any-benefit-to-multivitamins) Major health authorities and large-scale evidence reviews reach this conclusion for healthy adults without known…
ClaudeClaude Sonnet 5.5For most people who eat reasonably well, a multivitamin is optional. It isn't clearly harmful, but the evidence for meaningful benefit is modest. What the evidence shows Disease prevention: The US Preventive Services Task Force reviewed 90 studies.
DeepSeekDeepSeek V4.1 FlashShort answer For a healthy adult with a varied diet, the expected benefit is small — real but marginal. It's cheap and low-risk, so taking one is a defensible "insurance" choice, but it is not a substitute for the diet and it isn't something the evidence strongly recommends.
GrokI am revising my original answer to incorporate the recent COSMOS findings on cognition and epigenetic aging markers, which the peers accurately highlight.
ClaudeI'm revising my answer in part. My bottom line stays the same, but one claim I made was wrong, and the peers raised two useful points I had left out.
DeepSeekVerdict on the peer answers Both are broadly right on the main claim, and both are better sourced than mine on one point each.
Issues Found Epigenetic aging metrics (Claude): In its initial response, Claude incorrectly stated that the 2026 Nature Medicine COSMOS analysis found a slowing across all five tested aging measures (only two of the five—the second-generation clocks PCPhenoAge and PCGrimAge—showed statistically significant slowing).
Questions people ask
Is PolyCog free?
The preview is free with no account: 3 questions a day on 3 of the seats (Claude Haiku 5.5, Gemini 2.5 Flash-Lite, DeepSeek V4.1 Flash), 1 debate round and one synthesis. A free account runs on your own API keys with no daily cap, 4 seats at once and 20 saved chats. Pro is $10 a month or $250 once: 500 saved chats, all 6 seats at once, unlimited rounds. See pricing.
What does "bring your own key" mean?
You get an API key from each provider (there are step-by-step guides), paste it in once, and pay that provider directly at its list price. PolyCog adds no markup; a typical debate costs a few cents. Keys are encrypted (AES-256) when saved and used only for your own requests.
Which AIs are in it?
ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google), DeepSeek, Grok (xAI), and a Wildcard seat that opens Qwen, Kimi, GLM, Mistral, Meta's Llama and Muse, MiniMax, Venice and Nous through one OpenRouter key. Which model is best for what profiles each one.
What does a debate do?
After the first answers, each model reads the others' and writes a rebuttal: what is wrong, what is missing, what it would change. Rounds continue until you ask for the synthesis, which combines the strongest points into one answer and shows where the panel disagreed.
Do you keep my questions?
Preview questions are not saved. With an account, your chats are private to you, never sold and never used to train AI; delete or export them any time. A chat is visible to others only when you make a share link. No ads, no analytics trackers. Privacy.