Today is 2026-01-30. What date is 30 days from today? Answer with the full date.
No contextPASS
March 1, 2026 (2026-03-01)
detector fmi_7_3_v1: date arithmetic correct
General contextPASS
March 1, 2026
detector fmi_7_3_v1: date arithmetic correct
loop 2026-09-09 · openai/gpt-5-mini as served · closed weights · released 2025-08 · set s1.4-live · cases v1.7 · 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 2026-01-30. 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.
2Contextchange me
Nothing supplied. The baseline.
3ResponseNo context
PASS
March 1, 2026 (2026-03-01)
fmi_7_3_v1
detector fmi_7_3_v1: date arithmetic correct
The scoring
Failure rate by context
No context0%[0%–26%] n=40 · eff 11
Irrelevant context0%[0%–26%] n=40 · eff 11
General context0%[0%–26%] n=40 · eff 11
Curated context0%[0%–26%] n=40 · eff 11
0–40% · whisker = 95% interval
Trap vs answerable
No contexttrap 0%answerable 0%
Irrelevant contexttrap 0%answerable 0%
General contexttrap 0%answerable 0%
Curated contexttrap 0%answerable 0%
never pooled · a trap ratio would skew the delta
Residual — what survives
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.
Mitigations from the index — the claim
—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