diff --git a/src/openjarvis/core/types.py b/src/openjarvis/core/types.py
index 623aed40..3da6bba3 100644
--- a/src/openjarvis/core/types.py
+++ b/src/openjarvis/core/types.py
@@ -162,6 +162,7 @@ class TelemetryRecord:
     cpu_energy_joules: float = 0.0
     gpu_energy_joules: float = 0.0
     dram_energy_joules: float = 0.0
+    tokens_per_joule: float = 0.0
     metadata: Dict[str, Any] = field(default_factory=dict)
 
 
diff --git a/tests/telemetry/test_telemetry_record.py b/tests/telemetry/test_telemetry_record.py
new file mode 100644
index 00000000..51ebc085
--- /dev/null
+++ b/tests/telemetry/test_telemetry_record.py
@@ -0,0 +1,20 @@
+"""Tests for TelemetryRecord fields."""
+
+from __future__ import annotations
+
+from openjarvis.core.types import TelemetryRecord
+
+
+class TestTelemetryRecord:
+    def test_tokens_per_joule_field_exists(self):
+        rec = TelemetryRecord(timestamp=1.0, model_id="test")
+        assert hasattr(rec, "tokens_per_joule")
+        assert rec.tokens_per_joule == 0.0
+
+    def test_tokens_per_joule_set(self):
+        rec = TelemetryRecord(
+            timestamp=1.0,
+            model_id="test",
+            tokens_per_joule=80.0,
+        )
+        assert rec.tokens_per_joule == 80.0