diff --git a/docs/source/user_guide/benchmarks/index.rst b/docs/source/user_guide/benchmarks/index.rst
index a5a4e6cd1..0bae54c5a 100644
--- a/docs/source/user_guide/benchmarks/index.rst
+++ b/docs/source/user_guide/benchmarks/index.rst
@@ -17,4 +17,5 @@ Benchmarks
     tm_complexes
     conformers
     molecular_dynamics
+    molecular_reactions
     defect
diff --git a/docs/source/user_guide/benchmarks/molecular_reactions.rst b/docs/source/user_guide/benchmarks/molecular_reactions.rst
new file mode 100644
index 000000000..02e5ad8ab
--- /dev/null
+++ b/docs/source/user_guide/benchmarks/molecular_reactions.rst
@@ -0,0 +1,45 @@
+===================
+Molecular reactions
+===================
+
+Tautomers
+=========
+
+Summary
+-------
+
+Performance in predicting the relative energy of tautomer pairs. Each system is
+a pair of tautomers (constitutional isomers differing in the position of a
+proton and an associated double bond), and the benchmark measures how well a
+model reproduces the energy difference between the two forms. The structures are
+taken from the Tautobase dataset and are pre-optimised; only single-point
+energies are evaluated.
+
+Metrics
+-------
+
+1. Reaction energy MAE
+
+For each pair the reaction energy is the energy difference between the two
+tautomers. The mean absolute error (MAE) between the predicted and reference
+reaction energies is reported in kcal/mol, averaged across all pairs. Pairs on
+which inference fails are excluded from the average.
+
+Computational cost
+------------------
+
+Low: only single-point energies are evaluated, so tests run quickly even for the
+full dataset.
+
+Data availability
+-----------------
+
+Input structures:
+
+* Tautobase: an open tautomer database.
+  Wahl, O.; Sander, T. *J. Chem. Inf. Model.* 2020, 60 (3), 1085-1089.
+  DOI: 10.1021/acs.jcim.0c00035
+
+Reference data:
+
+* Same as input data
diff --git a/ml_peg/analysis/molecular_reactions/tautomers/analyse_tautomers.py b/ml_peg/analysis/molecular_reactions/tautomers/analyse_tautomers.py
new file mode 100644
index 000000000..05c2c6f16
--- /dev/null
+++ b/ml_peg/analysis/molecular_reactions/tautomers/analyse_tautomers.py
@@ -0,0 +1,241 @@
+"""Analyse Tautobase tautomer benchmark."""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+from ase.calculators.calculator import Calculator
+from mlipaudit.benchmarks.tautomers.tautomers import TautomersModelOutput
+import pytest
+
+from ml_peg.analysis.utils.decorators import build_table, plot_parity
+from ml_peg.analysis.utils.utils import build_dispersion_name_map, load_metrics_config
+from ml_peg.app import APP_ROOT
+from ml_peg.calcs import CALCS_ROOT
+from ml_peg.calcs.utils.mlipaudit import MlPegTautomersBenchmark
+from ml_peg.calcs.utils.utils import download_s3_data
+from ml_peg.models import current_models
+from ml_peg.models.get_models import load_models
+
+MODELS = load_models(current_models)
+DISPERSION_NAME_MAP = build_dispersion_name_map(MODELS)
+
+CALC_PATH = CALCS_ROOT / "molecular_reactions" / "tautomers" / "outputs"
+OUT_PATH = APP_ROOT / "data" / "molecular_reactions" / "tautomers"
+
+METRICS_CONFIG_PATH = Path(__file__).with_name("metrics.yml")
+DEFAULT_THRESHOLDS, DEFAULT_TOOLTIPS, DEFAULT_WEIGHTS = load_metrics_config(
+    METRICS_CONFIG_PATH
+)
+
+
+def labels() -> list:
+    """
+    Get the ordered list of tautomer pair IDs.
+
+    Returns
+    -------
+    list
+        List of all tautomer pair structure IDs.
+    """
+    for model_name in MODELS:
+        path = CALC_PATH / model_name / "model_output.json"
+        if path.exists():
+            output = TautomersModelOutput.model_validate_json(path.read_text())
+            return output.structure_ids
+    return []
+
+
+@pytest.fixture
+def analyze_results() -> dict:
+    """
+    Run the mlipaudit analysis for each model.
+
+    Returns
+    -------
+    dict
+        Mapping of model name to its ``TautomersResult``.
+    """
+    data_input_dir = download_s3_data(
+        key="inputs/molecular_reactions/tautomers/tautomers.zip",
+        filename="tautomers.zip",
+    )
+
+    results = {}
+    for model_name in MODELS:
+        path = CALC_PATH / model_name / "model_output.json"
+        if not path.exists():
+            continue
+        benchmark = MlPegTautomersBenchmark(
+            force_field=Calculator(),
+            data_input_dir=data_input_dir,
+            run_mode="standard",
+        )
+        benchmark.model_output = TautomersModelOutput.model_validate_json(
+            path.read_text()
+        )
+        results[model_name] = benchmark.analyze()
+    return results
+
+
+@pytest.fixture
+def struct_info() -> dict:
+    """
+    Write the combined element set to ``info.json`` for filtering.
+
+    Returns
+    -------
+    dict
+        Mapping with the sorted list of elements present in the dataset.
+    """
+    data_input_dir = download_s3_data(
+        key="inputs/molecular_reactions/tautomers/tautomers.zip",
+        filename="tautomers.zip",
+    )
+    benchmark = MlPegTautomersBenchmark(
+        force_field=Calculator(),
+        data_input_dir=data_input_dir,
+        run_mode="standard",
+    )
+    elements = sorted(
+        {
+            symbol
+            for pair in benchmark._tautomers_data.values()
+            for symbols in pair.atom_symbols
+            for symbol in symbols
+        }
+    )
+    info = {"elements": elements}
+    OUT_PATH.mkdir(parents=True, exist_ok=True)
+    (OUT_PATH / "info.json").write_text(json.dumps(info, indent=1))
+    return info
+
+
+@pytest.fixture
+@plot_parity(
+    filename=OUT_PATH / "figure_tautomers.json",
+    title="Tautomer reaction energies",
+    x_label="Predicted reaction energy / kcal/mol",
+    y_label="Reference reaction energy / kcal/mol",
+    hoverdata={
+        "Labels": labels(),
+    },
+)
+def tautomer_energies(analyze_results) -> dict[str, list]:
+    """
+    Get predicted and reference tautomer reaction energies.
+
+    Parameters
+    ----------
+    analyze_results
+        Mapping of model name to its ``TautomersResult``.
+
+    Returns
+    -------
+    dict[str, list]
+        Dictionary of reference and predicted reaction energies, aligned to the
+        ordered tautomer pair IDs.
+    """
+    ids = labels()
+    ref_map: dict[str, float] = {}
+    pred_maps: dict[str, dict[str, float]] = {}
+
+    for model_name, result in analyze_results.items():
+        pred_maps[model_name] = {}
+        for molecule in result.molecules:
+            if molecule.failed:
+                continue
+            pred_maps[model_name][molecule.structure_id] = (
+                molecule.predicted_energy_diff
+            )
+            ref_map.setdefault(molecule.structure_id, molecule.ref_energy_diff)
+
+    results = {"ref": [ref_map.get(i) for i in ids]}
+    for model_name in MODELS:
+        model_preds = pred_maps.get(model_name, {})
+        results[model_name] = [model_preds.get(i) for i in ids]
+    return results
+
+
+@pytest.fixture
+def get_mae(analyze_results) -> dict[str, float]:
+    """
+    Get the reaction energy mean absolute error for each model.
+
+    Parameters
+    ----------
+    analyze_results
+        Mapping of model name to its ``TautomersResult``.
+
+    Returns
+    -------
+    dict[str, float]
+        Mean absolute error in kcal/mol for each model.
+    """
+    return {model_name: result.mae for model_name, result in analyze_results.items()}
+
+
+@pytest.fixture
+def get_score(analyze_results) -> dict[str, float]:
+    """
+    Get the mlipaudit benchmark score for each model.
+
+    Parameters
+    ----------
+    analyze_results
+        Mapping of model name to its ``TautomersResult``.
+
+    Returns
+    -------
+    dict[str, float]
+        The mlipaudit per-molecule soft-threshold score (0 to 1) for each model.
+    """
+    return {model_name: result.score for model_name, result in analyze_results.items()}
+
+
+@pytest.fixture
+@build_table(
+    filename=OUT_PATH / "tautomers_metrics_table.json",
+    metric_tooltips=DEFAULT_TOOLTIPS,
+    thresholds=DEFAULT_THRESHOLDS,
+    weights=DEFAULT_WEIGHTS,
+    mlip_name_map=DISPERSION_NAME_MAP,
+)
+def metrics(
+    tautomer_energies, get_mae: dict[str, float], get_score: dict[str, float]
+) -> dict[str, dict]:
+    """
+    Get all metrics.
+
+    Parameters
+    ----------
+    tautomer_energies
+        Reference and predicted reaction energies (triggers the parity plot).
+    get_mae
+        Mean absolute errors for all models.
+    get_score
+        The mlipaudit benchmark scores for all models.
+
+    Returns
+    -------
+    dict[str, dict]
+        Metric names and values for all models.
+    """
+    return {
+        "MAE": get_mae,
+        "Tautomer Score": get_score,
+    }
+
+
+def test_tautomers(metrics: dict[str, dict], struct_info: dict) -> None:
+    """
+    Run tautomers analysis.
+
+    Parameters
+    ----------
+    metrics : dict[str, dict]
+        Tautomers metric results provided by fixtures.
+    struct_info : dict
+        Element info written to ``info.json`` for filtering.
+    """
diff --git a/ml_peg/analysis/molecular_reactions/tautomers/metrics.yml b/ml_peg/analysis/molecular_reactions/tautomers/metrics.yml
new file mode 100644
index 000000000..bc95bda72
--- /dev/null
+++ b/ml_peg/analysis/molecular_reactions/tautomers/metrics.yml
@@ -0,0 +1,13 @@
+metrics:
+  MAE:
+    good: 0.0
+    bad: 2.0
+    unit: kcal/mol
+    weight: 0
+    tooltip: Mean absolute error of tautomer relative (reaction) energies.
+  Tautomer Score:
+    good: 1.0
+    bad: 0.0
+    unit: null
+    weight: 1
+    tooltip: mlipaudit per-molecule soft-threshold score (MAE, failed molecules score 0).
diff --git a/ml_peg/app/molecular_reactions/tautomers/app_tautomers.py b/ml_peg/app/molecular_reactions/tautomers/app_tautomers.py
new file mode 100644
index 000000000..6df8d261c
--- /dev/null
+++ b/ml_peg/app/molecular_reactions/tautomers/app_tautomers.py
@@ -0,0 +1,65 @@
+"""Run Tautobase tautomer benchmark app."""
+
+from __future__ import annotations
+
+from dash import Dash
+from dash.html import Div
+
+from ml_peg.app import APP_ROOT
+from ml_peg.app.base_app import BaseApp
+from ml_peg.app.utils.build_callbacks import plot_from_table_column
+from ml_peg.app.utils.load import read_plot
+
+BENCHMARK_NAME = "Tautomers"
+DOCS_URL = "https://ddmms.github.io/ml-peg/user_guide/benchmarks/molecular_reactions.html#tautomers"
+DATA_PATH = APP_ROOT / "data" / "molecular_reactions" / "tautomers"
+
+
+class TautomersApp(BaseApp):
+    """Tautomers benchmark app layout and callbacks."""
+
+    def register_callbacks(self) -> None:
+        """Register callbacks to app."""
+        scatter = read_plot(
+            DATA_PATH / "figure_tautomers.json",
+            id=f"{BENCHMARK_NAME}-figure",
+        )
+
+        plot_from_table_column(
+            table_id=self.table_id,
+            plot_id=f"{BENCHMARK_NAME}-figure-placeholder",
+            column_to_plot={"MAE": scatter},
+        )
+
+
+def get_app() -> TautomersApp:
+    """
+    Get tautomers benchmark app layout and callback registration.
+
+    Returns
+    -------
+    TautomersApp
+        Benchmark layout and callback registration.
+    """
+    return TautomersApp(
+        name=BENCHMARK_NAME,
+        framework_ids="mlip_audit",
+        description=(
+            "Performance in predicting relative energies of tautomer pairs. "
+            "Reference data from the Tautobase dataset."
+        ),
+        docs_url=DOCS_URL,
+        table_path=DATA_PATH / "tautomers_metrics_table.json",
+        info_path=DATA_PATH / "info.json",
+        extra_components=[
+            Div(id=f"{BENCHMARK_NAME}-figure-placeholder"),
+        ],
+    )
+
+
+if __name__ == "__main__":
+    full_app = Dash(__name__, assets_folder=DATA_PATH.parent.parent)
+    benchmark_app = get_app()
+    full_app.layout = benchmark_app.layout
+    benchmark_app.register_callbacks()
+    full_app.run(port=8068, debug=True)
diff --git a/ml_peg/app/utils/frameworks.yml b/ml_peg/app/utils/frameworks.yml
index 27b079925..03d0b9dd4 100644
--- a/ml_peg/app/utils/frameworks.yml
+++ b/ml_peg/app/utils/frameworks.yml
@@ -11,6 +11,14 @@ mlip_arena:
   url: "https://huggingface.co/spaces/atomind/mlip-arena"
   logo: "https://huggingface.co/front/assets/huggingface_logo-noborder.svg"
 
+
+mlip_audit:
+  label: MLIP Audit
+  color: "#1d4ed8"
+  text_color: "#ffffff"
+  url: "https://github.com/instadeepai/mlipaudit"
+  logo: "https://raw.githubusercontent.com/instadeepai/mlipaudit/mlpeg-migration/InstaDeep_Logo.png"
+
 mace-multihead:
   label: Multihead Cross Learning
   color: "#7c3aed"
diff --git a/ml_peg/calcs/molecular_reactions/tautomers/calc_tautomers.py b/ml_peg/calcs/molecular_reactions/tautomers/calc_tautomers.py
new file mode 100644
index 000000000..21468e82f
--- /dev/null
+++ b/ml_peg/calcs/molecular_reactions/tautomers/calc_tautomers.py
@@ -0,0 +1,66 @@
+"""
+Compute the Tautobase dataset of tautomer relative energies.
+
+Tautobase: an open tautomer database.
+Wahl, O.; Sander, T. J. Chem. Inf. Model. 2020, 60 (3), 1085-1089.
+DOI: 10.1021/acs.jcim.0c00035
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+from warnings import warn
+
+from mlipaudit.benchmarks.tautomers.tautomers import TautomersModelOutput
+import pytest
+
+from ml_peg.calcs.utils.mlipaudit import MlPegTautomersBenchmark
+from ml_peg.calcs.utils.utils import download_s3_data
+from ml_peg.models import current_models
+from ml_peg.models.get_models import load_models
+
+MODELS = load_models(current_models)
+
+OUT_PATH = Path(__file__).parent / "outputs"
+
+
+@pytest.mark.parametrize("mlip", MODELS.items())
+def test_tautomers(mlip: tuple[str, Any]) -> None:
+    """
+    Benchmark the Tautobase dataset.
+
+    Parameters
+    ----------
+    mlip
+        Name of model and model object to get calculator.
+    """
+    model_name, model = mlip
+    calc = model.get_calculator(precision="high")
+    calc = model.add_d3_calculator(calc)
+
+    data_input_dir = download_s3_data(
+        key="inputs/molecular_reactions/tautomers/tautomers.zip",
+        filename="tautomers.zip",
+    )
+
+    out_path = OUT_PATH / model_name
+    out_path.mkdir(parents=True, exist_ok=True)
+
+    benchmark = MlPegTautomersBenchmark(
+        force_field=calc,
+        data_input_dir=data_input_dir,
+        run_mode="standard",
+    )
+    try:
+        benchmark.run_model()
+    except Exception as exc:
+        warn(
+            f"Error running tautomers benchmark for {model_name}: {exc}",
+            stacklevel=2,
+        )
+        benchmark.model_output = TautomersModelOutput(structure_ids=[], predictions=[])
+
+    (out_path / "model_output.json").write_text(
+        benchmark.model_output.model_dump_json()
+    )
diff --git a/ml_peg/calcs/utils/mlipaudit.py b/ml_peg/calcs/utils/mlipaudit.py
new file mode 100644
index 000000000..32e923523
--- /dev/null
+++ b/ml_peg/calcs/utils/mlipaudit.py
@@ -0,0 +1,16 @@
+"""Adapters for using mlipaudit benchmarks with ml-peg's ASE calculators."""
+
+from __future__ import annotations
+
+from mlipaudit.benchmarks.tautomers.tautomers import TautomersBenchmark
+
+
+class MlPegTautomersBenchmark(TautomersBenchmark):
+    """
+    TautomersBenchmark wired up for ml-peg's ASE calculators.
+
+    ``skip_if_elements_missing`` is disabled because ASE ``Calculator`` objects
+    do not expose ``allowed_atomic_numbers``.
+    """
+
+    skip_if_elements_missing = False