diff --git a/apps/api/services/workbook/conditions.py b/apps/api/services/workbook/conditions.py
index a0855330..a6baee79 100644
--- a/apps/api/services/workbook/conditions.py
+++ b/apps/api/services/workbook/conditions.py
@@ -24,6 +24,7 @@
 
 import logging
 import re
+from decimal import Decimal, InvalidOperation
 from typing import Dict
 
 logger = logging.getLogger("workbook.conditions")
@@ -192,15 +193,20 @@ def _compare(left: str, right: str, op: str) -> bool:
     """Compare two values with the given operator."""
     # Try numeric comparison
     try:
-        left_num = float(left)
-        right_num = float(right)
+        left_num = Decimal(left)
+        right_num = Decimal(right)
+        # Finite decimal operands retain the digits supplied by the caller.
+        # Preserve the existing float semantics for NaN and infinities.
+        if not left_num.is_finite() or not right_num.is_finite():
+            left_num = float(left)
+            right_num = float(right)
         if op == "==": return left_num == right_num
         if op == "!=": return left_num != right_num
         if op == ">":  return left_num > right_num
         if op == "<":  return left_num < right_num
         if op == ">=": return left_num >= right_num
         if op == "<=": return left_num <= right_num
-    except (ValueError, TypeError):
+    except (InvalidOperation, ValueError, TypeError):
         pass
 
     # String comparison
diff --git a/tests/test_workbook_condition_precision.py b/tests/test_workbook_condition_precision.py
new file mode 100644
index 00000000..101d59f4
--- /dev/null
+++ b/tests/test_workbook_condition_precision.py
@@ -0,0 +1,41 @@
+"""Public workbook conditions preserve numeric distinctions in actual row values."""
+
+import pytest
+
+from apps.api.services.workbook.conditions import evaluate_condition
+
+
+@pytest.mark.parametrize("value, threshold, operator, expected", [
+    ("9007199254740993", "9007199254740992", "==", False),
+    ("9007199254740993", "9007199254740992", "!=", True),
+    ("9007199254740993", "9007199254740992", ">", True),
+    ("9007199254740993", "9007199254740992", "<", False),
+    ("9007199254740993", "9007199254740992", ">=", True),
+    ("9007199254740993", "9007199254740992", "<=", False),
+    ("-9007199254740993", "-9007199254740992", "==", False),
+    ("-9007199254740993", "-9007199254740992", "!=", True),
+    ("-9007199254740993", "-9007199254740992", ">", False),
+    ("-9007199254740993", "-9007199254740992", "<", True),
+    ("-9007199254740993", "-9007199254740992", ">=", False),
+    ("-9007199254740993", "-9007199254740992", "<=", True),
+    ("9007199254740992.5", "9007199254740992.25", "==", False),
+    ("9007199254740992.5", "9007199254740992.25", "!=", True),
+    ("9007199254740992.5", "9007199254740992.25", ">", True),
+    ("9007199254740992.5", "9007199254740992.25", "<", False),
+    ("9007199254740992.5", "9007199254740992.25", ">=", True),
+    ("9007199254740992.5", "9007199254740992.25", "<=", False),
+    (9007199254740993, "9007199254740992", "==", False),
+    (-9007199254740993, "-9007199254740992", "<", True),
+    ("3.50", "3.5", "==", True),
+    ("1e3", "1000", "==", True),
+    ("009", "9", "==", True),
+    ("-4.25", "-4", "<", True),
+    ("Acme", '"Acme"', "==", True),
+    ("Other", '"Acme"', "!=", True),
+])
+def test_numeric_conditions_keep_original_operand_distinctions(
+    value, threshold, operator, expected,
+):
+    cells = {"score": {"value": value, "status": "complete"}}
+    expression = f"{{score}} {operator} {threshold}"
+    assert evaluate_condition(expression, cells, []) is expected