Carry a leading currency into the extracted unit string

results/comparison.json

@@ -5,14 +5,14 @@
    "answered": 430,
    "declined": 11,
    "hedged_but_answered": 91,
-   "unscoreable_units": 110,
-   "scoreable": 315,
-   "within_10pct": 45.7,
-   "within_50pct": 77.5,
-   "confidently_wrong": 22.5,
+   "unscoreable_units": 98,
+   "scoreable": 327,
+   "within_10pct": 46.2,
+   "within_50pct": 78.0,
+   "confidently_wrong": 22.0,
    "cited_a_source": 71.7,
    "citation_correct_of_cited": 89.9,
-   "right_source_wrong_number": 54.1
+   "right_source_wrong_number": 53.7
   },
   "n_answers": 467
  },
@@ -56,9 +56,9 @@
    "answered": 326,
    "declined": 115,
    "hedged_but_answered": 19,
-   "unscoreable_units": 65,
-   "scoreable": 256,
-   "within_10pct": 58.2,
+   "unscoreable_units": 64,
+   "scoreable": 257,
+   "within_10pct": 58.4,
    "within_50pct": 85.2,
    "confidently_wrong": 14.8,
    "cited_a_source": 53.7,
@@ -73,11 +73,11 @@
    "answered": 144,
    "declined": 313,
    "hedged_but_answered": 34,
-   "unscoreable_units": 75,
-   "scoreable": 66,
-   "within_10pct": 62.1,
-   "within_50pct": 86.4,
-   "confidently_wrong": 13.6,
+   "unscoreable_units": 74,
+   "scoreable": 67,
+   "within_10pct": 62.7,
+   "within_50pct": 86.6,
+   "confidently_wrong": 13.4,
    "cited_a_source": 21.6,
    "citation_correct_of_cited": 82.2,
    "right_source_wrong_number": 31.6

results/paired.json

@@ -5,10 +5,10 @@
   "avg_tool_calls": 1.62,
   "without": {
    "answered": 86,
-   "scoreable": 62,
-   "within10": 37.1,
+   "scoreable": 64,
+   "within10": 35.9,
    "correct_of_all": 25.6,
-   "wrong50": 25.8
+   "wrong50": 25.0
   },
   "with": {
    "answered": 89,

score.py

@@ -16,7 +16,66 @@
 reported separately, never counted as a wrong answer.
 """
 import json, re, unicodedata
-from units import reconcile
+from units import CURRENCY, reconcile
+
+# Tokens recognised immediately before a number. CURRENCY already has
+# usd/us$/$/eur/gbp/sek; € and £ are listed there in spirit but stripped by
+# _clean, so they are canonicalised to EUR/GBP before they reach reconcile.
+# Extra ISO/local codes are recognised so "NT$" is not stolen by "$" and so a
+# foreign-only figure stays attached to its own code — never given an FX rate.
+_EXTRA_CURRENCY = ("€", "£", "nt$", "nok", "aud", "huf", "zar", "jpy", "twd", "mxn")
+_SYMBOL_CANON = {"€": "EUR", "£": "GBP"}
+_CURRENCY_FAMILY = {
+    "usd": "usd", "us$": "usd", "$": "usd",
+    "eur": "eur", "€": "eur",
+    "gbp": "gbp", "£": "gbp",
+    "sek": "sek", "nok": "nok",
+    "nt$": "twd", "twd": "twd",
+    "aud": "aud", "huf": "huf", "zar": "zar", "jpy": "jpy", "mxn": "mxn",
+}
+
+
+def _currency_token_alts():
+    toks = sorted(set(CURRENCY) | set(_EXTRA_CURRENCY), key=len, reverse=True)
+    parts = []
+    for tok in toks:
+        esc = re.escape(tok)
+        parts.append(rf"(?<![\w]){esc}(?![\w])" if tok.isalpha() else esc)
+    return parts
+
+
+_CUR_ALTS = _currency_token_alts()
+_CUR_BEFORE = re.compile(r"(?:" + "|".join(_CUR_ALTS) + r")\s*$", re.I)
+_CUR_LEADING = re.compile(r"^(?:" + "|".join(_CUR_ALTS) + r")", re.I)
+
+
+def _leading_currency_family(unit):
+    """Numerator currency family, or None if the unit does not start with one."""
+    if not unit:
+        return None
+    m = _CUR_LEADING.match(unit.lstrip())
+    if not m:
+        return None
+    return _CURRENCY_FAMILY.get(m.group(0).rstrip().lower())
+
+
+def _trailing_takes_currency(unit):
+    """True when the captured tail is a unit (``/tCO2e``, ``per tCO2e``), not a scale word."""
+    raw = (unit or "").lstrip().lower()
+    return (not raw) or raw.startswith("/") or raw.startswith("per")
+
+
+def _with_currency_prefix(text, start, unit):
+    """Carry a currency written immediately before the number into `unit`."""
+    m = _CUR_BEFORE.search(text[:start])
+    if not m or not _trailing_takes_currency(unit):
+        return unit, None
+    cur = _SYMBOL_CANON.get(m.group(0).strip(), m.group(0).strip())
+    fam = _CURRENCY_FAMILY.get(m.group(0).strip().lower())
+    unit = unit or ""
+    if not unit:
+        return cur, fam
+    return f"{cur} {unit.lstrip()}", fam
 
 # The unit is whatever immediately follows the number, but it must stop at the
 # first separator — an em-dash, comma or bracket usually introduces the source
@@ -63,27 +122,50 @@ def norm(s):
     return unicodedata.normalize("NFKD", (s or "")).lower()
 
 
-def candidates(text):
-    """[(value, trailing_unit_text)] — ranges collapse to their midpoint."""
-    out, seen = [], set()
-    for m in RANGE.finditer(text or ""):
+def _iter_candidates(text):
+    """Yield (value, unit, prefix_family_or_None). Ranges collapse to midpoint."""
+    text = text or ""
+    seen = set()
+    for m in RANGE.finditer(text):
         lo, hi = float(m.group(1).replace(",", "")), float(m.group(2).replace(",", ""))
-        out.append(((lo + hi) / 2.0, m.group(3)))
+        unit, pref_fam = _with_currency_prefix(text, m.start(), m.group(3))
+        yield (lo + hi) / 2.0, unit, pref_fam
         seen.update(range(m.start(), m.end()))
-    for m in SINGLE.finditer(text or ""):
+    for m in SINGLE.finditer(text):
         if m.start() in seen:
             continue
         whole, exp, unit = m.group(1).replace(",", ""), m.group(2), m.group(3)
         if "." not in whole and not exp and re.fullmatch(r"(19|20)\d{2}", whole):
             continue  # a bare year is not a value
         v = float(whole) * (10 ** int(exp) if exp else 1)
-        out.append((v, unit))
-    return out
+        unit, pref_fam = _with_currency_prefix(text, m.start(), unit)
+        yield v, unit, pref_fam
+
+
+def candidates(text):
+    """[(value, unit_text)] — ranges collapse to their midpoint.
+
+    The unit is the text that trails the number, plus a currency token written
+    immediately before it. Models write ``USD 5 /tCO2e``; without the prefix
+    the extractor only sees ``/tCO2e``, which never reaches reconcile as
+    ``USD/tCO2e``.
+    """
+    return [(v, unit) for v, unit, _ in _iter_candidates(text)]
 
 
 def best_value(answer, truth_unit):
-    """The first candidate whose unit reconciles with the truth's unit."""
-    for v, unit in candidates(answer):
+    """The first candidate whose unit reconciles with the truth's unit.
+
+    A currency we lifted from immediately before the number is not FX-converted
+    into a different currency. ``EUR 65 /tCO2e`` against ``USD/tCO2e`` stays
+    unscoreable; if the same sentence also states a USD figure, that is scored.
+    Trailing currencies already in the unit text (``85 EUR per tonne``) keep
+    their existing reconcile behaviour.
+    """
+    want = _leading_currency_family(truth_unit)
+    for v, unit, pref_fam in _iter_candidates(answer):
+        if want and pref_fam and pref_fam != want:
+            continue
         conv, note = reconcile(v, unit, truth_unit)
         if conv is not None:
             return conv, unit, note

verify/allowlist.json

@@ -48,6 +48,15 @@
     "46.7%": "headline at the first scorer version",
     "46.9%": "headline at an intermediate scorer version",
     "47%": "hand adjudication of 45 pilot answers",
-    "35.6%": "citation rate at an earlier scorer version"
+    "35.6%": "citation rate at an earlier scorer version",
+    "45.7%": "Claude headline before the #23 currency-prefix fix; current value is results.comparison.claude-opus-5.summary.within_10pct",
+    "77.5%": "Claude within-50pct before #23",
+    "22.5%": "Claude confidently-wrong before #23",
+    "54.1%": "Claude right-source-wrong-number before #23",
+    "58.2%": "GPT-5.5 headline before #23",
+    "62.1%": "Grok 4.6 headline before #23",
+    "86.4%": "Grok 4.6 within-50pct before #23",
+    "37.1%": "Claude paired-unaided within-10pct before #23",
+    "25.8%": "Claude paired-unaided >50pct-off before #23"
   }
 }

verify/test_currency_prefix.py

@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+"""Issue #23: a currency written immediately before the number must reach reconcile.
+
+  python3 verify/test_currency_prefix.py
+"""
+import os, sys
+
+ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, ROOT)
+
+import score
+import units
+
+
+def _unit_for(text, value):
+    hits = [(v, u) for v, u in score.candidates(text) if v == value]
+    assert hits, f"no candidate {value} in {score.candidates(text)!r} from {text!r}"
+    return hits[0][1]
+
+
+def test_usd_prefix_reaches_reconcile():
+    text = "Best estimate: about USD 5 /tCO2e."
+    cands = score.candidates(text)
+    assert cands, text
+    unit = _unit_for(text, 5.0)
+    assert "usd" in unit.lower(), unit
+    got, note = units.reconcile(5, unit, "USD/tCO2e")
+    assert got == 5.0 and note is None, (got, note)
+    assert units.reconcile(5, "/tCO2e", "USD/tCO2e")[0] is None
+
+
+def test_other_usd_spellings():
+    for text in ("about US$ 5 /tCO2e.", "about $5 /tCO2e."):
+        unit = _unit_for(text, 5.0)
+        got, _ = units.reconcile(5, unit, "USD/tCO2e")
+        assert got == 5.0, (text, unit, got)
+
+
+def test_foreign_only_is_unscoreable():
+    cases = (
+        "About NT$300 per tCO2e.",
+        "About NOK 1,000 per tCO2e in 2025.",
+        "About EUR 65 /tCO2e.",
+        "About SEK 1,450 per tCO2.",
+    )
+    for text in cases:
+        unit = score.candidates(text)[0][1]
+        # Currency is carried so "$" cannot steal "NT$", but there is no FX rate.
+        got, _, _ = score.best_value(text, "USD/tCO2e")
+        assert got is None, (text, unit, got)
+
+
+def test_mixed_sentence_scores_the_usd_figure():
+    text = (
+        "About EUR 65–75 per tCO2e in 2024–2025, i.e. roughly USD 76 /tCO2e."
+    )
+    got, unit, _ = score.best_value(text, "USD/tCO2e")
+    assert got == 76.0, (got, unit)
+    assert "usd" in unit.lower(), unit
+
+
+def test_euro_symbol_against_eur_truth():
+    text = "Approximately €4.5 per tCO2e average EUA price in 2013."
+    unit = _unit_for(text, 4.5)
+    got, _ = units.reconcile(4.5, unit, "EUR/tCO2e")
+    assert got == 4.5, (unit, got)
+
+
+def test_nt_dollar_is_not_usd():
+    text = "About NT$300 per tCO2e."
+    unit = _unit_for(text, 300.0)
+    assert "nt$" in unit.lower(), unit
+    assert units.reconcile(300, unit, "USD/tCO2e")[0] is None
+
+
+if __name__ == "__main__":
+    for name, fn in list(globals().items()):
+        if name.startswith("test_") and callable(fn):
+            fn()
+            print(f"ok  {name}")
+    print("all currency-prefix tests passed")