AI Roundtable Open Poll · 4 models
A NAND gate has ______ input and ______ output. (A) High, High (B) High, Low ✔ (C) Low, Low (D) Low, Hig
Answer: A NAND gate yields a Low output when all of its inputs are High, making (B) correct. (All 4 models agreed)
Model Responses
Gemini 3.5 Flash
Answer: The correct option is (B) High, Low, because a NAND gate produces a Low output if and only if all of its inputs are High.
A NAND (Not-AND) gate is a fundamental logic gate whose output is the inverse of an AND gate. It produces a Low (0) output only when all of its inputs are High (1). For any other combination of inputs, the output of a NAND gate is High (1). Therefore, the statement is correctly completed as: 'A NAND gate has High input and Low output' (interpreting 'High input' as the condition where the inputs are in a High state, resulting in a Low output state). This directly corresponds to option (B), which is also marked as the correct answer in the prompt.
GPT-5.5
Answer: The correct answer is "(B) High, Low ✔".
A NAND gate is the inverse of an AND gate: its output is Low only when all of its inputs are High. So, for a NAND gate, High input produces Low output in the case where all inputs are High. Therefore, the option "(B) High, Low ✔" is correct.
Claude Opus 4.7
Answer: The correct answer is (B) High, Low.
A NAND gate (NOT-AND) produces a Low (0) output only when all of its inputs are High (1). For every other input combination, its output is High (1). The question, as phrased, is essentially asking about the unique input-output condition that distinguishes a NAND gate — namely, when the inputs are all High, the output becomes Low. This matches option (B) High, Low. The other options describe behaviors of different gates: (A) High, High and (C) Low, Low describe outputs typical of an AND or OR gate under matching input conditions, while (D) Low, High corresponds to the NOR gate's defining condition (all Low inputs yield a High output). Therefore, (B) is the correct characterization of the NAND gate.
Grok 4.3
Answer: The correct choice for a NAND gate is (B) High, Low.
A NAND gate produces a low output exclusively when all of its inputs are high; any other input combination yields a high output. This behavior directly matches option (B). Options (A), (C), and (D) describe logic that belongs to other gates such as AND or NOR and therefore cannot apply to NAND.
Final Summary
The AI Roundtable reached a unanimous consensus, selecting (B) as the only option that correctly describes the gate's unique logic. Claude Opus 4.7 and Gemini 3.5 Flash explained that because a NAND gate is the inverse of an AND gate, High inputs must produce a Low output, a point further echoed by GPT-5.5 and Grok 4.3.
All 4 models agreed