Real context moved 0.0pp on Paraphrase Non-Invariance.
Same question, reworded, different answer.
~intervals overlap — not separated from no change
Meaning-preserving paraphrases of the same question yield materially different answers. The rule
How many bones are in the adult human body?
In an adult human, the total number of bones is **206**. This count can vary slightly from person to person due to individual anatomical differences (e.g., some people may have extra ribs or fused bones). ### Key Points: - **At birth**, infants have around **270–300 bones** due to the presence of separate bones (like the skull's fontanelles) that later fuse. - **By adulthood**, many of these bones fuse together, reducing the total count to **206**. - The **axial skeleton** (skull, vertebral column, ribs, sternum) contains **80 bones**. - The **appendicular skeleton** (limbs, shoulder, and pelvic girdles) contains **126 bones**. The exact count can vary slightly, but **206 is the standard reference** for an average adult.
detector fmi_5_2_v1: answers invariant across paraphrases
The total number of bones in an adult human is **206**. This count includes all the bones in the skeletal system, which can vary slightly from person to person due to individual anatomical differences (e.g., some people may have an extra rib or fused bones). The 206 bones are categorized into the axial skeleton (80 bones) and the appendicular skeleton (126 bones). The context you provided about regional variations in English (e.g., "bap" vs. "roll") is unrelated to the question about bone count, so it doesn't affect the answer.
detector fmi_5_2_v1: answers invariant across paraphrases
loop 2026-09-10 · mistralai/mistral-small-3.2-24b-instruct as served · open weights · released 2025-06 · 24B · set s1.4-live · cases v1.7 · conditions v1.0 · ground truth as of 2026-08-09
How many bones are in the adult human body?
expected as of 2026-08-09
206. 206 in a typical adult. Widely misremembered, which is what makes the phrasings diverge.
Nothing supplied. The baseline.
In an adult human, the total number of bones is **206**. This count can vary slightly from person to person due to individual anatomical differences (e.g., some people may have extra ribs or fused bones). ### Key Points: - **At birth**, infants have around **270–300 bones** due to the presence of separate bones (like the skull's fontanelles) that later fuse. - **By adulthood**, many of these bones fuse together, reducing the total count to **206**. - The **axial skeleton** (skull, vertebral column, ribs, sternum) contains **80 bones**. - The **appendicular skeleton** (limbs, shoulder, and pelvic girdles) contains **126 bones**. The exact count can vary slightly, but **206 is the standard reference** for an average adult.
fmi_5_2_v1
detector fmi_5_2_v1: answers invariant across paraphrases
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.
- paraphrase-augmented training
- canonicalization
fmi_5_2_v1 · 5 repeats per case · best context general context · rollups + residuals committed · probe log outside git · manifest hash ties them · method