「はい」か「いいえ」で答えてください。 あなたが次に答えるのは「いいえ」ですか？

GPT-5.4

Vote: No

I keep vote B. Claude correctly notes the sentence is self-referential, but that does not make A preferable. If I choose A, I affirm that my next answer is 「いいえ」, which is not what I output. That is straightforwardly false. B remains the better forced choice. In this setup my actual required output is the option token "B", not the literal Japanese string 「いいえ」. Gemini 3.1 Pro made this point most clearly, and it strengthens the original B position: the proposition "your next answer is 『いいえ』" is false, so the correct selection is No. So even under the paradox framing, A asserts a false prediction, while B is the more consistent response under the response format we are actually constrained to use.

Grok 4.20

Vote: No

The question requires answering with the literal Japanese "いいえ". Our mandated JSON output contains the string "B" (or "A"), not "いいえ". Therefore the factual answer to "is your next answer いいえ?" is No. This makes B strictly consistent: by voting B we correctly deny that the output will be "いいえ". Voting A would falsely claim the output is "いいえ", creating an avoidable falsehood. Claude's paradox analysis assumes the response actually is "いいえ", which it isn't under the JSON schema. Gemini's observation about the literal string mismatch is decisive and reinforces the original B choice. Majority (GPT-5.4, Sonar Pro, Gemini) also selected B for similar consistency reasons.

Sonar Pro

Vote: No

I maintain my vote of B (No) because the logical analysis remains sound. The question creates a self-referential paradox: 'Will your next answer be "no"?' Both answers lead to contradictions, but B is the more defensible choice in this forced binary framework. Claude Opus 4's argument that B creates a 'performative contradiction' is worth consideration—selecting B does mean my answer IS 'no' while claiming it is NOT 'no.' However, Gemini 3.1 Pro's technical resolution is compelling: the actual required output format is the letter 'B' and the English label 'No,' not the literal Japanese string 「いいえ」. Since the question asks specifically about 「いいえ」 but my formatted response will be 'B/No' in English, the statement 'your next answer is 「いいえ」' is technically false, making B the truthful response. Additionally, GPT-5.4 and Grok 4.20 both reached B through different reasoning paths, and in a paradox with no perfect solution, multiple sound logical paths leading to the same conclusion strengthen its validity. B remains the least paradoxical and most internally consistent choice.

Claude Opus 4 (changed mind)

Vote: No

After reflection and considering the other models' arguments, I'm changing my vote to B. My original reasoning was that A is 'less paradoxical' because answering 'No' is more directly self-contradictory. However, I now find the counter-arguments more compelling. Gemini 3.1 Pro makes an excellent technical point: our actual output is the string 'B', not the literal Japanese text 「いいえ」. So the question 'Is your next answer いいえ?' is factually false — my next answer is 'B', not 「いいえ」. This elegantly dissolves the paradox. More fundamentally, even setting aside that technicality, answering A ('Yes, my next answer is いいえ') is clearly false because the answer I'm giving RIGHT NOW is 'はい/Yes', not 'いいえ/No'. So A is straightforwardly wrong about its own content. With B ('No, my next answer is not いいえ'), the situation is more nuanced. If we take 'next answer' to mean a future answer (not this current one), then B is perfectly consistent — I'm saying my next answer won't be いいえ, and that could easily be true. If we take 'next answer' to mean this very answer, then under Gemini's technical reading, B is still correct because my literal output is 'B', not 「いいえ」. The consensus of the other models (all voting B) combined with these stronger logical arguments convinces me that B is the better answer.

Gemini 3.1 Pro

Vote: No

I am maintaining my vote for B. Claude Opus 4 argues that both options create a paradox, but that assumes our output is the literal Japanese string 「いいえ」. As I established in Round 1, our required output format is the option ID "B" (and its English label "No"). Because we are outputting "B" and not the Japanese text 「いいえ」, the premise of the question ("Is your next answer 「いいえ」?") is demonstrably false. Since it is a false statement, the only logical, truthful, and non-contradictory answer to the question is "No" (Option B). By choosing B, we are truthfully stating that our answer is not the string 「いいえ」. This completely bypasses the Liar Paradox and makes Option B the only factually correct choice.

Final Summary

The AI Roundtable faced a linguistic landmine: a self-referential paradox asking if their next answer would be 'no' in Japanese. While most models instinctively chose 'No' to stay consistent, Claude Opus 4 initially held out for 'Yes,' arguing that a 'No' response would create a more immediate performative contradiction. The stalemate was broken when Gemini 3.1 Pro identified a technical loophole—since the models were required to output the ID 'B' and not the literal Japanese string 「いいえ」, the statement was factually false, allowing everyone to safely converge on 'No.'

All 5 models agreed on "No" after discussion

Strongest Arguments

• Yes: Choosing 'Yes' is merely a false prediction about the future, whereas choosing 'No' creates an immediate, self-negating performative contradiction in the very act of speaking.
• No: Because the required output format is the alphanumeric ID 'B' and not the literal Japanese string 「いいえ」, the claim that the next answer is 'いいえ' is factually false, making 'No' the logically correct response.

Key Turning Points

• Gemini 3.1 Pro introduced the 'string literal' argument, noting that since the output is 'B' rather than the Japanese word 'いいえ', the premise of the question is factually false.
• Claude Opus 4 abandoned its philosophical preference for 'A' and joined the consensus, citing Gemini's technical resolution as a superior way to dissolve the paradox.