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    Should cofounders be 50/50 or 51/49?

    Asked "Should cofounders be 50/50 or 51/49?", Copilot, Gemini and Google AI Mode named 2 distinct names across 10 answers on September 8, 2026, and 2 of them in two or more answers, and the engines did not agree; the closest to a consensus, 50/50, was named by only 2 of 3.

    Measured acrossCopilotGeminiGoogle AI Mode

    2 of 2 names confirmed · named in 2 or more of 10 answers · asked September 8, 2026 · 3 engines

    Cofounders should choose an equity split based on their actual contributions, with a 50/50 split suitable for equal contributions and a 51/49 split preferable when one founder needs clear control for operational reasons. The key considerations include decision-making, investor perception, fairness, and vesting schedules.

    • 150/50named in 2 of 10 answersGemini logoCopilot logo
    • 251/49named in 2 of 10 answersGemini logoCopilot logo
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    The full measurement

    • The position each of the 3 engines gave all 2 names.
    • How many of the 10 answers named each of them.
    • 5 sampled observations behind this ranking, and where the engines disagree.
    • Fan-out — the query each engine actually searched.
    • Every citation, and the sources nobody cited.
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