diff --git a/python/scripts/nvbench_compare.py b/python/scripts/nvbench_compare.py
index f4bc220..de09b7f 100644
--- a/python/scripts/nvbench_compare.py
+++ b/python/scripts/nvbench_compare.py
@@ -41,8 +41,10 @@ GPU_TIME_STDEV_RELATIVE_TAG = "nv/cold/time/gpu/stdev/relative"
 GPU_TIME_Q1_TAG = "nv/cold/time/gpu/q1"
 GPU_TIME_MEDIAN_TAG = "nv/cold/time/gpu/median"
 GPU_TIME_Q3_TAG = "nv/cold/time/gpu/q3"
-GPU_TIME_IR_TAG = "nv/cold/time/gpu/ir/absolute"
-GPU_TIME_IR_RELATIVE_TAG = "nv/cold/time/gpu/ir/relative"
+GPU_TIME_IQR_TAG = "nv/cold/time/gpu/iqr/absolute"
+GPU_TIME_IQR_RELATIVE_TAG = "nv/cold/time/gpu/iqr/relative"
+LEGACY_GPU_TIME_IR_TAG = "nv/cold/time/gpu/ir/absolute"
+LEGACY_GPU_TIME_IR_RELATIVE_TAG = "nv/cold/time/gpu/ir/relative"
 GPU_SM_CLOCK_RATE_MEAN_TAG = "nv/cold/sm_clock_rate/mean"
 SAMPLE_TIMES_TAG = "nv/json/bin:nv/cold/sample_times"
 SAMPLE_FREQUENCIES_TAG = "nv/json/freqs-bin:nv/cold/sample_freqs"
@@ -681,6 +683,19 @@ def extract_summary_float(summaries, tag, *, null_value=None):
     return normalize_float_value(extract_summary_value(summary), null_value=null_value)
 
 
+def extract_summary_float_with_fallback(
+    summaries: list[dict[str, Any]],
+    primary_tag: str,
+    fallback_tag: str,
+    *,
+    null_value: float | None = None,
+) -> float | None:
+    value = extract_summary_float(summaries, primary_tag, null_value=null_value)
+    if value is not None:
+        return value
+    return extract_summary_float(summaries, fallback_tag, null_value=null_value)
+
+
 def extract_binary_filename(summary):
     value = extract_summary_data_value(summary, "filename", "string")
     if not isinstance(value, str):
@@ -809,11 +824,17 @@ def extract_gpu_timing_data(summaries, json_dir=None, float32_reader=read_float3
         first_quartile=extract_summary_float(summaries, GPU_TIME_Q1_TAG),
         median=extract_summary_float(summaries, GPU_TIME_MEDIAN_TAG),
         third_quartile=extract_summary_float(summaries, GPU_TIME_Q3_TAG),
-        interquartile_range=extract_summary_float(
-            summaries, GPU_TIME_IR_TAG, null_value=math.inf
+        interquartile_range=extract_summary_float_with_fallback(
+            summaries,
+            GPU_TIME_IQR_TAG,
+            LEGACY_GPU_TIME_IR_TAG,
+            null_value=math.inf,
         ),
-        interquartile_range_relative=extract_summary_float(
-            summaries, GPU_TIME_IR_RELATIVE_TAG, null_value=math.inf
+        interquartile_range_relative=extract_summary_float_with_fallback(
+            summaries,
+            GPU_TIME_IQR_RELATIVE_TAG,
+            LEGACY_GPU_TIME_IR_RELATIVE_TAG,
+            null_value=math.inf,
         ),
         sm_clock_rate_mean=extract_summary_float(summaries, GPU_SM_CLOCK_RATE_MEAN_TAG),
         sample_source=sample_source,
diff --git a/python/test/test_nvbench_compare.py b/python/test/test_nvbench_compare.py
index 3ae755a..8548f3d 100644
--- a/python/test/test_nvbench_compare.py
+++ b/python/test/test_nvbench_compare.py
@@ -424,6 +424,18 @@ def test_gpu_timing_data_parses_quartiles_and_sm_clock_rate_mean(nvbench_compare
     assert timing.frequencies is None
 
 
+def test_gpu_timing_data_accepts_legacy_ir_tags(nvbench_compare):
+    timing = nvbench_compare.extract_gpu_timing_data(
+        [
+            make_summary(nvbench_compare, "LEGACY_GPU_TIME_IR_TAG", "0.5"),
+            make_summary(nvbench_compare, "LEGACY_GPU_TIME_IR_RELATIVE_TAG", "0.25"),
+        ],
+    )
+
+    assert timing.interquartile_range == pytest.approx(0.5)
+    assert timing.interquartile_range_relative == pytest.approx(0.25)
+
+
 def test_gpu_timing_data_treats_mismatched_sample_and_frequency_counts_as_unavailable(
     tmp_path, nvbench_compare
 ):
@@ -977,7 +989,7 @@ def test_compare_benches_reports_regression_when_robust_intervals_and_clock_conf
             make_summary(nvbench_compare, "GPU_TIME_Q1_TAG", "0.95"),
             make_summary(nvbench_compare, "GPU_TIME_MEDIAN_TAG", "1.0"),
             make_summary(nvbench_compare, "GPU_TIME_Q3_TAG", "1.05"),
-            make_summary(nvbench_compare, "GPU_TIME_IR_RELATIVE_TAG", "0.01"),
+            make_summary(nvbench_compare, "GPU_TIME_IQR_RELATIVE_TAG", "0.01"),
             make_summary(nvbench_compare, "GPU_SM_CLOCK_RATE_MEAN_TAG", "100.0"),
         ]
     )
@@ -988,7 +1000,7 @@ def test_compare_benches_reports_regression_when_robust_intervals_and_clock_conf
             make_summary(nvbench_compare, "GPU_TIME_Q1_TAG", "1.18"),
             make_summary(nvbench_compare, "GPU_TIME_MEDIAN_TAG", "1.2"),
             make_summary(nvbench_compare, "GPU_TIME_Q3_TAG", "1.25"),
-            make_summary(nvbench_compare, "GPU_TIME_IR_RELATIVE_TAG", "0.01"),
+            make_summary(nvbench_compare, "GPU_TIME_IQR_RELATIVE_TAG", "0.01"),
             make_summary(nvbench_compare, "GPU_SM_CLOCK_RATE_MEAN_TAG", "100.0"),
         ]
     )
@@ -1025,7 +1037,7 @@ def test_compare_benches_accepts_custom_comparison_thresholds(
             make_summary(nvbench_compare, "GPU_TIME_Q1_TAG", "0.995"),
             make_summary(nvbench_compare, "GPU_TIME_MEDIAN_TAG", "1.0"),
             make_summary(nvbench_compare, "GPU_TIME_Q3_TAG", "1.01"),
-            make_summary(nvbench_compare, "GPU_TIME_IR_RELATIVE_TAG", "0.01"),
+            make_summary(nvbench_compare, "GPU_TIME_IQR_RELATIVE_TAG", "0.01"),
         ]
     )
     cmp_state = make_state(nvbench_compare, "state", mean="1.01", noise="0.01")
@@ -1035,7 +1047,7 @@ def test_compare_benches_accepts_custom_comparison_thresholds(
             make_summary(nvbench_compare, "GPU_TIME_Q1_TAG", "1.005"),
             make_summary(nvbench_compare, "GPU_TIME_MEDIAN_TAG", "1.01"),
             make_summary(nvbench_compare, "GPU_TIME_Q3_TAG", "1.02"),
-            make_summary(nvbench_compare, "GPU_TIME_IR_RELATIVE_TAG", "0.01"),
+            make_summary(nvbench_compare, "GPU_TIME_IQR_RELATIVE_TAG", "0.01"),
         ]
     )