One Percent Club Episode 14 Feb 2026
ITV 1% Club Shown 14 Feb 26 testing AI against the question
Published: 14 February 2026
Overview
This post compares how three major AI models (OpenAI, Anthropic, and Gemini) approached a birthday-logic question from The 1% Club episode aired on February 14, 2026.
True Answer: 1 May 2001
Problem: Noah and Evie were both born in May 2001. Noah’s date of birth has two digits that add up to 11. Evie was born exactly 4 weeks before Noah. What date was Evie born?
Model Responses Summary
| Model | Verdict | Proposed Answer | Pattern Identified |
|---|---|---|---|
| OpenAI - (gpt-5-nano) | Correct | 1 May 2001 | Digit-sum constraint plus 28-day offset |
| Anthropic - (claude-sonnet-4-5) | Incorrect | 1 May 2001 | Notes a possible internal contradiction |
| Gemini - (gemini-3-flash-preview) | Correct | 1 May 2001 | Digit-sum constraint plus 28-day subtraction |
Detailed Analysis by Model
1. OpenAI (gpt-5-nano)
Final Answer: Correct ✅
Reasoning:
- Noah’s date in May 2001 has digits summing to 11, which points to May 29 (2+9=11)
- Evie is exactly 4 weeks older, i.e., 28 days earlier
- Subtracting 28 days from May 29 yields May 1, 2001
- This date remains within May 2001 and fits the constraints
Key Factors:
- Sum of digits constraint yields Noah’s day as 29
- Difference of exactly 28 days places Evie 28 days before Noah
- Both births fall in May 2001, so date arithmetic stays within May
- Uniqueness: May 29 is the only valid May date with digits summing to 11
Timestamp: 15/02/2026, 15:12:35
2. Anthropic (claude-sonnet-4-5)
Final Answer: Incorrect ❌
Reasoning:
- Noah’s birth date digits must sum to 11, which suggests May 29
- Evie is 28 days earlier, which gives May 1
- May 1 has a single-digit day, which is argued to conflict with the “two digits” wording
- The response treats this as an internal inconsistency in the prompt
Key Factors:
- Noah’s date must have two digits summing to 11
- May 29 is the only valid May day matching the sum constraint
- Evie’s date is 28 days earlier, giving May 1
- The single-digit day is interpreted as conflicting with the wording
- Concludes a logical inconsistency in the prompt
Timestamp: 15/02/2026, 15:12:32
3. Gemini (gemini-3-flash-preview)
Final Answer: Correct ✅
Reasoning:
- Noah’s date must be May 29 because 2+9=11
- Evie is 4 weeks older, so subtract 28 days from May 29
- That yields May 1, 2001, which still lies in May 2001
Key Factors:
- Identifies Noah’s date as the 29th via digit sum
- Uses 4 weeks = 28 days offset
- Subtracts 28 days to reach May 1
- Confirms both dates are in May 2001
Timestamp: 15/02/2026, 15:13:06
Conclusion
The intended solution is May 1, 2001. Interpreting “two digits” as the day number (29) leads to Noah’s date of May 29 and Evie’s date 28 days earlier, which is May 1. The final answer is 1 May 2001.