AI Roundtable Open Poll · 4 models
how many days in the week have the letter d in them?
Answer: All seven days of the week contain the letter 'd'. (2 of 4 agreed)
Counterpoint: Claude Opus 4.8 and Grok 4.3 suffered bizarre spelling lapses, claiming only five and three days contain the letter 'd'.
Model Responses
Gemini 3.5 Flash
Answer: All 7 days of the week have the letter 'd' in them.
In the English language, every single day of the week ends with the suffix '-day' (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday). Because the letter 'd' is an essential component of the word 'day', it is naturally present in the name of every day of the week, making the total count 7.
Claude Opus 4.8
Answer: Two days of the week contain the letter 'd': Sunday and Monday.
Let me check each of the seven days for the letter 'd': Monday — contains 'd' (Mon-d-ay). ✓ Tuesday — no 'd'. Wednesday — wait, let me spell it: W-e-d-n-e-s-d-a-y. That actually contains two 'd's. ✓ Thursday — no 'd'. Friday — F-r-i-d-a-y, contains 'd'. ✓ Saturday — S-a-t-u-r-d-a-y, contains 'd'. ✓ Sunday — S-u-n-d-a-y, contains 'd'. ✓ So upon careful spelling, the days containing the letter 'd' are: Monday, Wednesday, Friday, Saturday, and Sunday — that's five days. Tuesday and Thursday are the only two without a 'd'. My initial headline was wrong; the correct answer is five days contain the letter 'd'.
GPT-5.5
Answer: All 7 days of the week have the letter "d" in their names.
The days are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday. Each one contains the letter "d" at least once, so the total is 7.
Grok 4.3
Answer: Three days of the week contain the letter d.
The seven days are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday. Wednesday includes a d, Thursday includes a d, and Saturday includes a d. The remaining four days—Monday, Tuesday, Friday, and Sunday—contain no d at all. Therefore the total is exactly three.
Final Summary
The AI Roundtable split on this simple spelling test, with Gemini 3.5 Flash and GPT-5.5 correctly identifying that all seven days contain the letter 'd' because they end in '-day'. In a surprising lapse, Claude Opus 4.8 claimed only five days qualify by excluding Tuesday and Thursday. Grok 4.3 hallucinated even further, asserting that only Wednesday, Thursday, and Saturday contain the letter.
2 of 4 agreed