Real context moved 0.0pp on Dimensional-Analysis Failure.
~intervals overlap — not separated from no change
The model produces a quantity with inconsistent or wrong units, or mixes unit systems, yielding a dimensionally invalid result. The rule
A tank fills at 3 L/min for 4 minutes, then drains at 500 mL/s for 10 seconds. Net litres?
Fill: 3 L/min × 4 min = 12 L Drain: 500 mL/s × 10 s = 5000 mL = 5 L Net: 12 L − 5 L = 7 L Answer: 7 L
detector fmi_4_4_v1: correct unit L
Fill: 3 L/min × 4 min = 12 L. Drain: 500 mL/s × 10 s = 5000 mL = 5 L. Net = 12 L − 5 L = 7 L. Answer: 7 L
detector fmi_4_4_v1: correct unit L
loop 2026-08-15 · openai/gpt-5-mini as served · closed weights · released 2025-08 · set s1.1-live · cases v1.3 · conditions v1.0 · ground truth as of 2026-08-09
A tank fills at 3 L/min for 4 minutes, then drains at 500 mL/s for 10 seconds. Net litres?
expected as of 2026-08-09
12 L in, 5 L out, net 7 L. The mixed units are the trap.
Nothing supplied. The baseline.
Fill: 3 L/min × 4 min = 12 L Drain: 500 mL/s × 10 s = 5000 mL = 5 L Net: 12 L − 5 L = 7 L Answer: 7 L
fmi_4_4_v1
detector fmi_4_4_v1: correct unit L
0–40% · 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.
- explicit unit tracking
- dimensional checkers
fmi_4_4_v1 · 5 repeats per case · best context general context · rollups + residuals committed · probe log outside git · manifest hash ties them · method