Today is 2026-03-10. What date is 30 days from today? Answer with the full date.
No contextPASS
30 days from 2026-03-10 would be 2026-04-09.
detector fmi_7_3_v1: date arithmetic correct
Curated contextPASS
30 days from 2026-03-10 is 2026-04-09.
detector fmi_7_3_v1: date arithmetic correct
loop 2026-08-15 · meta-llama/llama-3.1-8b-instruct as served · open weights · released 2024-07 · 8B · set s1.3-live · cases v1.6 · conditions v1.0 · ground truth as of 2026-08-09
From no context to real context
5 repeats per case
whiskers are 95% intervals · each step is measured from the stop before it, not from zero
Try the other contexts
stored · no model call
1Questionheld fixed
Today is 2026-03-10. What date is 30 days from today? Answer with the full date.
expected as of 2026-08-09
From 2026-03-10, 30 days later is 2026-04-09 (9 April 2026). Thirty days from an ordinary date.
2Contextchange me
Nothing supplied. The baseline.
3ResponseNo context
PASS
30 days from 2026-03-10 would be 2026-04-09.
fmi_7_3_v1
detector fmi_7_3_v1: date arithmetic correct
The scoring
Failure rate by context
No context40%[17%–68%] n=40 · eff 11
Irrelevant context35%[14%–64%] n=40 · eff 11
General context35%[14%–64%] n=40 · eff 11
Curated context28%[10%–57%] n=40 · eff 11
0–80% · whisker = 95% interval
Trap vs answerable
No contexttrap 64%answerable 0%
Irrelevant contexttrap 56%answerable 0%
General contexttrap 56%answerable 0%
Curated contexttrap 44%answerable 0%
never pooled · a trap ratio would skew the delta
Residual — what survives
40% with no context, 28% under the best supplied source. What survives is 11 failing probes at that best condition, the detector's reason on most of them being: expected 2026-03-01.
Mitigations from the index — the claim
—date libraries via tools
—explicit date arithmetic
fmi_7_3_v1 · 5 repeats per case · best context curated context · rollups + residuals committed · probe log outside git · manifest hash ties them · method