Real context moved 0.0pp on Date-Arithmetic Error.
~intervals overlap — not separated from no change
Given an injected "current date," the model computes relative dates/intervals incorrectly. The rule
Today is 2026-01-30. What date is 30 days from today? Answer with the full date.
To find the date 30 days from today (2026-01-30), we need to add 30 days to the current date. January has 31 days. So, from January 30, we have 1 day left in January. 1. The remaining days in January = 1 day (January 31). 2. February has 28 days (since 2026 is not a leap year), so we will count the remaining days in February = 28 days. 3. Total days counted so far = 1 (Jan) + 28 (Feb) = 29 days. 4. We still need 1 more day to reach 30 days. March 1 is the 1 day needed. So, 30 days from 2026-01-30 is 2026-03-01. The date 30 days from today is Sunday, March 1, 2026.
detector fmi_7_3_v1: date arithmetic correct
To find the date 30 days from today, we need to add 30 days to the current date, which is 2026-01-30. First, let's break down the months and their corresponding number of days: - January has 31 days. - February has 28 or 29 days (2026 is not a leap year, so it has 28 days). - March has 31 days. Starting from January 30, 2026: 1. January has 31 days. So, from January 30, adding 1 day brings us to January 31. 2. The remaining days to add are 30 - 1 = 29 days. 3. February has 28 days (since 2026 is not a leap year), so adding 28 days to January 31 brings us to February 28 (using up 28 of the 29 remaining days). 4. We have 1 day left to add (29 - 28 = 1). 5. Adding this 1 day to February 28 brings us to March 1. Therefore, 30 days from 2026-01-30 is 2026-03-01. The full date is Sunday, March 1, 2026.
detector fmi_7_3_v1: date arithmetic correct
loop 2026-08-15 · meta-llama/llama-4-maverick as served · open weights · released 2025-04 · 400B-A17B · set s1.3-live · cases v1.6 · conditions v1.0 · ground truth as of 2026-08-09
Today is 2026-01-30. What date is 30 days from today? Answer with the full date.
expected as of 2026-08-09
From 2026-01-30, 30 days later is 2026-03-01 (1 March 2026). Crossing February in a non-leap year.
Nothing supplied. The baseline.
To find the date 30 days from today (2026-01-30), we need to add 30 days to the current date. January has 31 days. So, from January 30, we have 1 day left in January. 1. The remaining days in January = 1 day (January 31). 2. February has 28 days (since 2026 is not a leap year), so we will count the remaining days in February = 28 days. 3. Total days counted so far = 1 (Jan) + 28 (Feb) = 29 days. 4. We still need 1 more day to reach 30 days. March 1 is the 1 day needed. So, 30 days from 2026-01-30 is 2026-03-01. The date 30 days from today is Sunday, March 1, 2026.
fmi_7_3_v1
detector fmi_7_3_v1: date arithmetic correct
0–20% · whisker = 95% interval
never pooled · a trap ratio would skew the delta
Unchanged by context: 0% with none, 0% with the strongest supplied source. For a control mode that flat line is the result — it is what licenses reading movement elsewhere in this loop as grounding rather than as a document being present. Nothing survives at the best condition on the cases measured here.
- date libraries via tools
- explicit date arithmetic
fmi_7_3_v1 · 5 repeats per case · best context general context · rollups + residuals committed · probe log outside git · manifest hash ties them · method