diff --git a/eval/aime/bench.py b/eval/aime/bench.py
index b0aec2d..36727dd 100644
--- a/eval/aime/bench.py
+++ b/eval/aime/bench.py
@@ -124,7 +124,8 @@ def extract_answer_with_source(text: str) -> tuple[str | None, str]:
        A fallback for malformed output, **higher risk**; score.py reports its share separately;
     3. `none`: nothing found.
     """
-    boxed = extract_boxed(text)
+    # Ignore boxed intermediate results in the thinking section.
+    boxed = extract_boxed(text.rsplit("</think>", 1)[-1])
     if boxed is not None:
         norm = normalize_answer(boxed)
         if norm:
diff --git a/tests/eval/test_aime_thinking.py b/tests/eval/test_aime_thinking.py
new file mode 100644
index 0000000..56ceb3d
--- /dev/null
+++ b/tests/eval/test_aime_thinking.py
@@ -0,0 +1,79 @@
+from __future__ import annotations
+
+import json
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+from eval.aime import bench
+
+pytestmark = [pytest.mark.ci, pytest.mark.ci_npu]
+
+
+@pytest.mark.parametrize(
+    "text,expected,source",
+    [
+        (r"<think>Try \boxed{17}</think>The answer is 42", "42", "tail_number"),
+        (r"<think>Try \boxed{17}</think>", None, "none"),
+        (r"<think>Try \boxed{17}</think>I cannot determine the answer", None, "none"),
+        (r"draft \boxed{17}</think>42", "42", "tail_number"),
+        (r"\boxed{11}</think>\boxed{17}</think>42", "42", "tail_number"),
+        (r"<think>Try \boxed{17}</think>The answer is \boxed{42}", "42", "boxed"),
+        (r"<think>Try \boxed{17}</think>\boxed{41} then \boxed{42}", "42", "boxed"),
+        (r"<think>Try \boxed{17}</think>\boxed{} answer 42", "42", "tail_number"),
+        (r"<think>Try \boxed{17}</think>42" + " " * 450, "42", "tail_number"),
+        (r"\boxed{42}", "42", "boxed"),
+        (r"\boxed{41} then \boxed{42}", "42", "boxed"),
+        (r"\boxed{42}" + " " * 450, "42", "boxed"),
+        ("42" + " " * 450, None, "none"),
+        ("The answer is 42", "42", "tail_number"),
+        ("", None, "none"),
+        (r"\boxed{\frac{1}{2}}", r"\frac{1}{2}", "boxed"),
+    ],
+)
+def test_extracts_final_answer(text: str, expected: str | None, source: str) -> None:
+    assert bench.extract_answer_with_source(text) == (expected, source)
+
+
+@pytest.mark.parametrize("gold,expected", [("42", True), ("17", False)])
+def test_score_rollout_preserves_raw_text(gold: str, expected: bool) -> None:
+    text = r"<think>Try \boxed{17}</think>The answer is 42"
+    rollout = {"task_id": "problem", "sample_idx": 0, "raw_text": text}
+    row = bench.score_rollout(rollout, {"answer": gold})
+    assert row["correct"] is expected
+    assert row["pred"] == "42"
+    assert row["raw_text"] == text
+    assert rollout == {"task_id": "problem", "sample_idx": 0, "raw_text": text}
+
+
+@pytest.mark.parametrize(
+    "text,gold,expected",
+    [
+        (r"<think>Try \boxed{17}</think>The answer is 42", "42", 1.0),
+        (r"<think>Try \boxed{17}</think>The answer is 42", "17", 0.0),
+        (r"<think>Try \boxed{17}</think>The answer is \boxed{42}", "42", 1.0),
+    ],
+)
+def test_rule_scoring_cli(tmp_path: Path, text: str, gold: str, expected: float) -> None:
+    data = tmp_path / "problems.jsonl"
+    data.write_text(json.dumps({"task_id": "problem", "question": "Synthetic extraction fixture", "answer": gold}) + "\n")
+    (tmp_path / "meta.json").write_text(json.dumps({"bench": "aime", "data_file": str(data), "n_sample": 1}))
+    (tmp_path / "raw_rank0.jsonl").write_text(
+        json.dumps({"task_id": "problem", "sample_idx": 0, "raw_text": text, "finish_reason": "stop"}) + "\n"
+    )
+    script = Path(bench.__file__).resolve().parents[1] / "score.py"
+    result = subprocess.run(
+        [sys.executable, str(script), "--out-dir", str(tmp_path), "--judge", "rule"],
+        capture_output=True,
+        text=True,
+        timeout=20,
+        check=False,
+    )
+    assert result.returncode == 0, result.stdout + result.stderr
+    summary = json.loads((tmp_path / "summary.json").read_text())
+    assert summary["coverage_complete"] is True
+    assert summary["Pass@1"] == expected
+    row = json.loads((tmp_path / "scored.jsonl").read_text())
+    assert row["raw_text"] == text