今1万円貰うか、1年後に12000円貰う

GPT-5.4

Vote: 今1万円貰う

私はAに投票します。 比較すべきは金額そのものではなく、時間価値です。今1万円を受け取ると、すぐに使える・運用できる・不確実性を避けられるという利点があります。 1年後の1万2000円は名目上は20%多いですが、その増加分が魅力的かどうかは、待つリスクやインフレ、資金拘束をどう見るか次第です。追加の2000円のために1年待つ必要があります。 また、この種の設問では、確実性と即時利用可能性を重視するのが合理的です。特に割引率や利回り条件が明示されていない以上、今すぐ受け取れる価値のほうを優先する判断に説得力があります。

Grok 4.20

Vote: 1年後に12000円貰う

The choice implies a 20% annual return (2,000 yen extra on 10,000 yen). Safe investment options in Japan currently yield far less than 20%. Receiving 12,000 yen guaranteed in one year therefore provides a superior effective return compared to taking 10,000 yen now and investing it at realistic rates. Behavioral biases often favor immediate rewards, but economically this is dominated by the delayed option assuming no default risk.

Gemini 3.1 Pro

Vote: 1年後に12000円貰う

The mathematical and economic superiority of waiting one year is clear. By waiting, you gain an additional 2,000 yen, which represents a 20% guaranteed annual return. In modern financial markets, finding a risk-free investment that yields 20% in a single year is practically impossible. Even if you took the 10,000 yen today and invested it, you are highly unlikely to turn it into 12,000 yen within a year without taking on substantial risk. Furthermore, a 20% increase comfortably outpaces any realistic inflation rate. Your real purchasing power will be significantly higher in one year than it is today. Unless you are facing an absolute financial emergency where the 10,000 yen is needed for immediate survival, choosing the 12,000 yen after one year is the objectively rational choice.

Claude Opus 4

Vote: 1年後に12000円貰う

This is a classic intertemporal choice question. Waiting 1 year to receive 12,000 yen instead of 10,000 yen today represents a 20% return on the "investment" of waiting. A 20% annual return is exceptionally high compared to virtually any standard financial instrument available today. Bank savings accounts in Japan offer near-zero interest rates, and even aggressive stock market investments average around 7-10% annually with significant risk. From a purely rational economic perspective, unless you have an immediate urgent need for the 10,000 yen or face a discount rate higher than 20% (which would be unusual for most people), choosing to wait one year for 12,000 yen is the superior option. The 2,000 yen gain (20% return) far exceeds typical opportunity costs of waiting. While behavioral economics shows that many people prefer immediate gratification (hyperbolic discounting), the rational choice here is clearly to wait for the larger amount.

Final Summary

The AI Roundtable was largely swayed by the allure of a high-interest return, with Gemini 3.1 Pro, Claude Opus 4, and Grok 4.20 all concluding that a 20% annual gain is an unbeatable financial opportunity. GPT-5.4 stood alone in the minority, arguing that immediate liquidity and the elimination of future uncertainty provide a value that nominal gains cannot easily match.

No agreement after 1 rounds of discussion. Final vote: 今1万円貰う: 1, 1年後に12000円貰う: 3

Strongest Arguments

• 今1万円貰う: Immediate access to funds allows for instant utility or investment while avoiding the inherent risks and 'funding constraints' associated with waiting a full year for a payout.
• 1年後に12000円貰う: A 20% guaranteed annual return is practically impossible to find in modern financial markets, especially in Japan where interest rates are near zero, making the delay exceptionally profitable.