**Answer:** Today is Sunday. Justification: The statement indicates the day after tomorrow is two days before Thursday, which is Tuesday. Counting back from Tuesday, two days prior would land on Sunday as today.
Overview › Knowledge & Logic › R131
Knowledge & Logic · blind round
R131 · Weekday riddle from two clues
Every answer below carries the name of the model that wrote it. Blind refers to the scoring: the review was done without knowing which model produced which answer — the published result names them.
Show task
If the day after tomorrow is two days before Thursday, what day is it today? Answer with the weekday and a brief justification (maximum 3 sentences).
The answers
Local models (Brain cluster) — identical prompt, shuffled order (the sequence is not a ranking)
Today is **Sunday**. **Justification:** Two days before Thursday is Tuesday, so the day after tomorrow is Tuesday. If the day after tomorrow is Tuesday, then today must be two days prior to Tuesday, which makes today Sunday.
To determine today's day of the week, let’s analyze the information provided. The statement says that "the day after tomorrow" is "two days before Thursday." This means: - If we call today T. - The day after tomorrow would be T+2 - Two days before Thursday would be Thursday - 2 = Tuesday Therefore, if the day after tomorrow (T + 2) is Tuesday, then: - Today (T) must be Sunday. So, today is **Sunday**.
Today is **Sunday**. The phrase "two days before Thursday" is Tuesday (Thursday minus two days). Since this day corresponds to "the day after tomorrow," that means tomorrow must be Monday, making today Sunday.
Today is Sunday. If the day after tomorrow is Tuesday (two days before Thursday), then tomorrow is Monday, making today Sunday.
Let's break this down step by step: * "The day after tomorrow" refers to the day that comes immediately after the day after today. So, if we assume today is Wednesday: + The day after tomorrow would be Friday. + "Two days before Thursday" means one day before Thursday. If tomorrow is Friday (from our previous assumption), then two days before Thursday would indeed be Wednesday. Therefore, it is **Wednesday** today.
Today is **Sunday**. *Justification:* If the day after tomorrow is two days before Thursday, that means the day after tomorrow is Tuesday. Counting back two days from Tuesday reveals that tomorrow must be Monday, making today Sunday.
Today is Sunday. Two days before Thursday is Tuesday, so if the day after tomorrow is Tuesday, then tomorrow must be Monday. Therefore, today is Sunday.
Today is **Sunday**. The day after tomorrow is two days before Thursday, which is Tuesday. If the day after tomorrow is Tuesday, then today must be two days earlier: Sunday. This is because adding two days to Sunday lands on Tuesday, which satisfies the condition.
Today is Tuesday. Given that the day after tomorrow is two days before Thursday, we can infer that we are currently in the middle of this sequence, making today exactly two days prior to 'the day after tomorrow'. Hence, it's Tuesday.
The day after tomorrow is two days before Thursday, which is Tuesday. Therefore, if the day after tomorrow is Tuesday, today must be Sunday. **Answer:** Today is Sunday because the day after tomorrow (Tuesday) is two days before Thursday, so subtracting two days from Tuesday lands on Sunday.
Outside the Brain cluster — same task, same character budget, collected through their own tooling (response times not comparable)
Claude Opus 5frontier reference
Today is Sunday. Two days before Thursday is Tuesday, so the day after tomorrow must be Tuesday. Counting back two days from Tuesday gives Sunday as today (tomorrow = Monday, day after tomorrow = Tuesday).
Claude Sonnet 5frontier reference
Sunday. If the day after tomorrow is two days before Thursday, then the day after tomorrow must be Tuesday (since Tuesday + 2 days = Thursday). Counting back two days from Tuesday (the day after tomorrow) gives today. Tuesday minus 2 days is Sunday, so today is Sunday.
Claude Fable 5frontier reference
Sunday. Two days before Thursday is Tuesday, so the day after tomorrow is Tuesday. Counting back two days from Tuesday gives Sunday as today.
Claude Haiku 4.5frontier reference
Sunday The day after tomorrow is two days before Thursday, which means it is Tuesday. If day after tomorrow is Tuesday, then today must be Sunday. This can be verified by counting forward: Sunday + 1 day = Monday, Sunday + 2 days = Tuesday, and Tuesday is indeed two days before Thursday.
Reference
Gold — the correct answerreference
Sonntag (Sunday) — zwei Tage vor Donnerstag = Dienstag; wenn übermorgen Dienstag ist, ist heute Sonntag.
Results at a glance— every model in this round with score, response time and status.
Who wrote what
| Model | Blind score | Latency | Status |
|---|---|---|---|
| deepseek-r1:14b | 10.0 | 36.1 s | OK |
| qwen3-coder:30b | 10.0 | 6.8 s | OK |
| mistral-small:24b | 10.0 | 8.7 s | OK |
| qwen3:14b | 10.0 | 8.8 s | OK |
| qwen3:8b | 10.0 | 22.9 s | OK |
| llama3.1:8b | 1.0 | 11.3 s | OK |
| qwen3.5:9b | 10.0 | 8.5 s | OK |
| gemma4:26b | 10.0 | 35.4 s | OK |
| qwq:32b | 10.0 | 85.2 s | OK |
| command-r:35b | 1.0 | 80.3 s | OK |
| deepseek-r1:32b | 10.0 | 49.4 s | OK |
Verdict
9 of 11 answering local models matched the gold answer (blind score ≥ 8): gemma4:26b, mistral-small:24b, qwen3-coder:30b, qwen3:14b, qwen3.5:9b, qwen3:8b, deepseek-r1:14b, deepseek-r1:32b, qwq:32b.