diff --git a/CHANGELOG.md b/CHANGELOG.md
index 65bcbd0c7cb..c05682a7879 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ Docs: https://docs.openclaw.ai
 - Plugins/install: move managed plugin install metadata from `plugins.installs`
   to the state-managed `plugins/installs.json` ledger, with legacy config reads
   kept as a deprecated compatibility fallback. Thanks @vincentkoc.
+- Diagnostics/OTEL: add the GenAI `gen_ai.client.operation.duration` histogram for model-call latency in seconds with bounded provider/model/API and error attributes. Thanks @vincentkoc.
 - Diagnostics/OTEL: add bounded outbound message delivery lifecycle diagnostics and export them as low-cardinality delivery spans/metrics without message body, recipient, room, or media-path data. (#71471) Thanks @vincentkoc and @jlapenna.
 - Diagnostics/OTEL: emit bounded exec-process diagnostics and export them as `openclaw.exec` spans without exposing command text, working directories, or container identifiers. (#71451) Thanks @vincentkoc and @jlapenna.
 - Diagnostics/OTEL: support `OPENCLAW_OTEL_PRELOADED=1` so the plugin can reuse an already-registered OpenTelemetry SDK while keeping OpenClaw diagnostic listeners wired. (#71450) Thanks @vincentkoc and @jlapenna.
diff --git a/extensions/diagnostics-otel/src/service.test.ts b/extensions/diagnostics-otel/src/service.test.ts
index 80de301e823..dda4fd4704c 100644
--- a/extensions/diagnostics-otel/src/service.test.ts
+++ b/extensions/diagnostics-otel/src/service.test.ts
@@ -740,6 +740,63 @@ describe("diagnostics-otel service", () => {
     await service.stop?.(ctx);
   });
 
+  test("exports GenAI client operation duration histogram without diagnostic identifiers", async () => {
+    const service = createDiagnosticsOtelService();
+    const ctx = createOtelContext(OTEL_TEST_ENDPOINT, { metrics: true });
+    await service.start(ctx);
+
+    emitDiagnosticEvent({
+      type: "model.call.completed",
+      runId: "run-1",
+      callId: "call-1",
+      sessionKey: "session-key",
+      provider: "openai",
+      model: "gpt-5.4",
+      api: "openai-completions",
+      durationMs: 250,
+    });
+    emitDiagnosticEvent({
+      type: "model.call.error",
+      runId: "run-1",
+      callId: "call-2",
+      sessionKey: "session-key",
+      provider: "google",
+      model: "gemini-2.5-flash",
+      api: "google-generative-ai",
+      durationMs: 1250,
+      errorCategory: "TimeoutError",
+    });
+    await flushDiagnosticEvents();
+
+    expect(telemetryState.meter.createHistogram).toHaveBeenCalledWith(
+      "gen_ai.client.operation.duration",
+      expect.objectContaining({
+        unit: "s",
+        advice: {
+          explicitBucketBoundaries: expect.arrayContaining([0.01, 0.32, 2.56, 81.92]),
+        },
+      }),
+    );
+    const genAiOperationDuration = telemetryState.histograms.get(
+      "gen_ai.client.operation.duration",
+    );
+    expect(genAiOperationDuration?.record).toHaveBeenCalledTimes(2);
+    expect(genAiOperationDuration?.record).toHaveBeenCalledWith(0.25, {
+      "gen_ai.operation.name": "text_completion",
+      "gen_ai.provider.name": "openai",
+      "gen_ai.request.model": "gpt-5.4",
+    });
+    expect(genAiOperationDuration?.record).toHaveBeenCalledWith(1.25, {
+      "gen_ai.operation.name": "generate_content",
+      "gen_ai.provider.name": "google",
+      "gen_ai.request.model": "gemini-2.5-flash",
+      "error.type": "TimeoutError",
+    });
+    expect(JSON.stringify(genAiOperationDuration?.record.mock.calls)).not.toContain("session-key");
+    expect(JSON.stringify(genAiOperationDuration?.record.mock.calls)).not.toContain("run-1");
+    await service.stop?.(ctx);
+  });
+
   test("exports run, model call, and tool execution lifecycle spans", async () => {
     const service = createDiagnosticsOtelService();
     const ctx = createOtelContext(OTEL_TEST_ENDPOINT, { traces: true, metrics: true });
diff --git a/extensions/diagnostics-otel/src/service.ts b/extensions/diagnostics-otel/src/service.ts
index f9470b15cdb..46a61043059 100644
--- a/extensions/diagnostics-otel/src/service.ts
+++ b/extensions/diagnostics-otel/src/service.ts
@@ -55,6 +55,9 @@ const GEN_AI_LATEST_EXPERIMENTAL_OPT_IN = "gen_ai_latest_experimental";
 const GEN_AI_TOKEN_USAGE_BUCKETS = [
   1, 4, 16, 64, 256, 1024, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216, 67108864,
 ];
+const GEN_AI_OPERATION_DURATION_BUCKETS = [
+  0.01, 0.02, 0.04, 0.08, 0.16, 0.32, 0.64, 1.28, 2.56, 5.12, 10.24, 20.48, 40.96, 81.92,
+];
 
 type OtelContentCapturePolicy = {
   inputMessages: boolean;
@@ -585,6 +588,16 @@ export function createDiagnosticsOtelService(): OpenClawPluginService {
           explicitBucketBoundaries: GEN_AI_TOKEN_USAGE_BUCKETS,
         },
       });
+      const genAiOperationDurationHistogram = meter.createHistogram(
+        "gen_ai.client.operation.duration",
+        {
+          unit: "s",
+          description: "GenAI client operation duration",
+          advice: {
+            explicitBucketBoundaries: GEN_AI_OPERATION_DURATION_BUCKETS,
+          },
+        },
+      );
       const costCounter = meter.createCounter("openclaw.cost.usd", {
         unit: "1",
         description: "Estimated model cost (USD)",
@@ -1307,12 +1320,25 @@ export function createDiagnosticsOtelService(): OpenClawPluginService {
         "openclaw.api": lowCardinalityAttr(evt.api),
         "openclaw.transport": lowCardinalityAttr(evt.transport),
       });
+      const genAiModelCallMetricAttrs = (
+        evt: ModelCallLifecycleDiagnosticEvent,
+        errorType?: string,
+      ) => ({
+        "gen_ai.operation.name": genAiOperationName(evt.api),
+        "gen_ai.provider.name": lowCardinalityAttr(evt.provider),
+        "gen_ai.request.model": lowCardinalityAttr(evt.model),
+        ...(errorType ? { "error.type": errorType } : {}),
+      });
 
       const recordModelCallCompleted = (
         evt: Extract<DiagnosticEventPayload, { type: "model.call.completed" }>,
         metadata: DiagnosticEventMetadata,
       ) => {
         modelCallDurationHistogram.record(evt.durationMs, modelCallMetricAttrs(evt));
+        genAiOperationDurationHistogram.record(
+          evt.durationMs / 1000,
+          genAiModelCallMetricAttrs(evt),
+        );
         if (!tracesEnabled) {
           return;
         }
@@ -1344,18 +1370,23 @@ export function createDiagnosticsOtelService(): OpenClawPluginService {
         evt: Extract<DiagnosticEventPayload, { type: "model.call.error" }>,
         metadata: DiagnosticEventMetadata,
       ) => {
+        const errorType = lowCardinalityAttr(evt.errorCategory, "other");
         modelCallDurationHistogram.record(evt.durationMs, {
           ...modelCallMetricAttrs(evt),
-          "openclaw.errorCategory": lowCardinalityAttr(evt.errorCategory, "other"),
+          "openclaw.errorCategory": errorType,
         });
+        genAiOperationDurationHistogram.record(
+          evt.durationMs / 1000,
+          genAiModelCallMetricAttrs(evt, errorType),
+        );
         if (!tracesEnabled) {
           return;
         }
         const spanAttrs: Record<string, string | number | boolean> = {
           "openclaw.provider": evt.provider,
           "openclaw.model": evt.model,
-          "openclaw.errorCategory": lowCardinalityAttr(evt.errorCategory, "other"),
-          "error.type": lowCardinalityAttr(evt.errorCategory, "other"),
+          "openclaw.errorCategory": errorType,
+          "error.type": errorType,
         };
         assignGenAiModelCallAttrs(spanAttrs, evt);
         if (evt.api) {