off-topic: anyone aware of a service where I could plugin my api keys for openai/gemini/claude and it asks the same question to all 3 and refines the answer by using one of them as the final arbiter ?

https://msty.app (cross-platform) and https://chorus.sh (Mac only) do that though they are both a desktop app rather than a service. Arguably better than putting your API key somewhere online in my opinion.