diff --git a/extensions/ollama/src/stream-runtime.test.ts b/extensions/ollama/src/stream-runtime.test.ts
index 81a7a5f20337..c33b4ad491b3 100644
--- a/extensions/ollama/src/stream-runtime.test.ts
+++ b/extensions/ollama/src/stream-runtime.test.ts
@@ -1202,6 +1202,19 @@ describe("buildAssistantMessage", () => {
       total: 0,
     });
   });
+
+  it("records unavailable cache telemetry when Ollama omits the cache split", () => {
+    const response = {
+      model: "qwen3:32b",
+      created_at: "2026-01-01T00:00:00Z",
+      message: { role: "assistant" as const, content: "ok" },
+      done: true,
+      prompt_eval_count: 10,
+      eval_count: 2,
+    };
+    const result = buildAssistantMessage(response, modelInfo);
+    expect(result.usage.cacheTelemetry).toEqual({ state: "unavailable" });
+  });
 });
 
 // Helper: build a ReadableStreamDefaultReader from NDJSON lines
diff --git a/extensions/ollama/src/stream.ts b/extensions/ollama/src/stream.ts
index 5e855fd4acfe..58236b6de570 100644
--- a/extensions/ollama/src/stream.ts
+++ b/extensions/ollama/src/stream.ts
@@ -561,17 +561,24 @@ function buildUsageWithNoCost(params: {
   output?: number;
   cacheRead?: number;
   cacheWrite?: number;
+  cacheTelemetry?: Usage["cacheTelemetry"];
   totalTokens?: number;
 }): Usage {
   const input = params.input ?? 0;
   const output = params.output ?? 0;
   const cacheRead = params.cacheRead ?? 0;
   const cacheWrite = params.cacheWrite ?? 0;
+  const cacheTelemetry =
+    params.cacheTelemetry ??
+    (params.cacheRead !== undefined && params.cacheWrite !== undefined
+      ? { state: "available" as const }
+      : { state: "unavailable" as const });
   return {
     input,
     output,
     cacheRead,
     cacheWrite,
+    cacheTelemetry,
     totalTokens: params.totalTokens ?? input + output,
     cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
   };
diff --git a/extensions/qa-lab/src/runtime-parity-cache-diagnostics.test.ts b/extensions/qa-lab/src/runtime-parity-cache-diagnostics.test.ts
index c157fa9c09c8..c3092eed9511 100644
--- a/extensions/qa-lab/src/runtime-parity-cache-diagnostics.test.ts
+++ b/extensions/qa-lab/src/runtime-parity-cache-diagnostics.test.ts
@@ -98,6 +98,114 @@ describe("runtime parity prompt-cache diagnostics", () => {
     });
   });
 
+  it("treats Ollama adapter cache zeros as unavailable telemetry", async () => {
+    const tempRoot = await seedRuntimeParityCacheTranscript([
+      { role: "user", content: "Inspect cache telemetry." },
+      {
+        role: "assistant",
+        content: "done",
+        api: "ollama",
+        provider: "ollama",
+        model: "qwen3.5:9b",
+        usage: {
+          input: 22,
+          output: 7,
+          total: 29,
+          cacheRead: 0,
+          cacheWrite: 0,
+          cacheTelemetry: { state: "unavailable" },
+        },
+      },
+    ]);
+
+    const cell = await captureRuntimeParityCell({
+      runtime: "openclaw",
+      gateway: { tempRoot },
+      scenarioResult: { status: "pass" },
+      wallClockMs: 10,
+    });
+
+    expect(cell.usage).toEqual({
+      inputTokens: 22,
+      outputTokens: 7,
+      totalTokens: 29,
+    });
+    expect(cell.cacheDiagnostics).toEqual({
+      assistantTurns: 1,
+      cacheTelemetryTurns: 0,
+      cacheHitTurns: 0,
+      cacheWriteTurns: 0,
+      cacheMisses: [],
+      cacheMissInputTokens: 0,
+      unmeasuredPostWarmTurns: [],
+    });
+  });
+
+  it("preserves unavailable cache telemetry from pre-marker Ollama transcripts", async () => {
+    const tempRoot = await seedRuntimeParityCacheTranscript([
+      { role: "user", content: "Inspect cache telemetry." },
+      {
+        role: "assistant",
+        content: "done",
+        api: "ollama",
+        provider: "ollama",
+        model: "qwen3.5:9b",
+        usage: { input: 22, output: 7, total: 29, cacheRead: 0, cacheWrite: 0 },
+      },
+    ]);
+
+    const cell = await captureRuntimeParityCell({
+      runtime: "openclaw",
+      gateway: { tempRoot },
+      scenarioResult: { status: "pass" },
+      wallClockMs: 10,
+    });
+
+    expect(cell.usage).toEqual({
+      inputTokens: 22,
+      outputTokens: 7,
+      totalTokens: 29,
+    });
+    expect(cell.cacheDiagnostics?.cacheTelemetryTurns).toBe(0);
+  });
+
+  it("preserves an explicitly measured zero-cache result", async () => {
+    const tempRoot = await seedRuntimeParityCacheTranscript([
+      { role: "user", content: "Inspect cache telemetry." },
+      {
+        role: "assistant",
+        content: "done",
+        api: "ollama",
+        provider: "ollama",
+        model: "future-ollama",
+        usage: {
+          input: 22,
+          output: 7,
+          total: 29,
+          cacheRead: 0,
+          cacheWrite: 0,
+          cacheTelemetry: { state: "available" },
+        },
+      },
+    ]);
+
+    const cell = await captureRuntimeParityCell({
+      runtime: "openclaw",
+      gateway: { tempRoot },
+      scenarioResult: { status: "pass" },
+      wallClockMs: 10,
+    });
+
+    expect(cell.usage).toEqual({
+      inputTokens: 22,
+      outputTokens: 7,
+      totalTokens: 29,
+      cacheRead: 0,
+      cacheWrite: 0,
+    });
+    expect(cell.cacheDiagnostics?.cacheTelemetryTurns).toBe(1);
+  });
+
   it("identifies the first complete cache miss after a cache-warming write", () => {
     const diagnostics = buildRuntimeParityCacheDiagnostics([
       usage(3, { cacheRead: 0, cacheWrite: 24_407 }),
diff --git a/extensions/qa-lab/src/runtime-parity.ts b/extensions/qa-lab/src/runtime-parity.ts
index 2f0dfe4a2e71..841015d0ba28 100644
--- a/extensions/qa-lab/src/runtime-parity.ts
+++ b/extensions/qa-lab/src/runtime-parity.ts
@@ -241,9 +241,14 @@ function readUsageTotals(raw: unknown): RuntimeParityUsage {
     readFiniteNumber(usage.outputTokens) ??
     readFiniteNumber(usage.output_tokens) ??
     0;
-  const cacheRead = readFiniteNumber(usage.cacheRead) ?? readFiniteNumber(usage.cache_read_tokens);
-  const cacheWrite =
-    readFiniteNumber(usage.cacheWrite) ?? readFiniteNumber(usage.cache_write_tokens);
+  const cacheTelemetryUnavailable =
+    isMessageRecord(usage.cacheTelemetry) && usage.cacheTelemetry.state === "unavailable";
+  const cacheRead = cacheTelemetryUnavailable
+    ? undefined
+    : (readFiniteNumber(usage.cacheRead) ?? readFiniteNumber(usage.cache_read_tokens));
+  const cacheWrite = cacheTelemetryUnavailable
+    ? undefined
+    : (readFiniteNumber(usage.cacheWrite) ?? readFiniteNumber(usage.cache_write_tokens));
   const componentTotal = inputTokens + outputTokens + (cacheRead ?? 0) + (cacheWrite ?? 0);
   const totalTokens =
     readFiniteNumber(usage.total) ??
@@ -259,6 +264,26 @@ function readUsageTotals(raw: unknown): RuntimeParityUsage {
   };
 }
 
+function readAssistantUsage(message: Record<string, unknown>): RuntimeParityUsage {
+  const usage = readUsageTotals(message.usage ?? null);
+  if (!isMessageRecord(message.usage) || isMessageRecord(message.usage.cacheTelemetry)) {
+    return usage;
+  }
+  const provider = readNonEmptyString(message.provider)?.toLowerCase();
+  const api = readNonEmptyString(message.api)?.toLowerCase();
+  if (
+    (provider === "ollama" || api === "ollama") &&
+    usage.cacheRead === 0 &&
+    usage.cacheWrite === 0
+  ) {
+    // Transcripts written before cacheTelemetry was added contain Ollama's
+    // required placeholder zeros. Explicit current provenance always wins.
+    delete usage.cacheRead;
+    delete usage.cacheWrite;
+  }
+  return usage;
+}
+
 function addUsage(target: RuntimeParityUsage, next: RuntimeParityUsage) {
   target.inputTokens += next.inputTokens;
   target.outputTokens += next.outputTokens;
@@ -1002,7 +1027,7 @@ function aggregateUsage(records: RuntimeParityTranscriptRecord[]): RuntimeParity
     if (record.role !== "assistant") {
       continue;
     }
-    const usage = readUsageTotals(record.message.usage ?? null);
+    const usage = readAssistantUsage(record.message);
     addUsage(totals, usage);
   }
   return totals;
@@ -1474,7 +1499,7 @@ export async function captureRuntimeParityCell(
     cacheDiagnostics: buildRuntimeParityCacheDiagnostics(
       transcriptRecords
         .filter((record) => record.role === "assistant")
-        .map((record) => readUsageTotals(record.message.usage ?? null)),
+        .map((record) => readAssistantUsage(record.message)),
     ),
     wallClockMs: params.wallClockMs,
     ...(params.bootstrapWallClockMs === undefined
diff --git a/packages/llm-core/src/types.ts b/packages/llm-core/src/types.ts
index 1e12b4a8c1d2..d81f897b6236 100644
--- a/packages/llm-core/src/types.ts
+++ b/packages/llm-core/src/types.ts
@@ -273,6 +273,8 @@ export interface Usage {
   output: number;
   cacheRead: number;
   cacheWrite: number;
+  /** Whether the provider reported a cache-read/write token split. */
+  cacheTelemetry?: { state: "available" | "unavailable" };
   /** Subset of `cacheWrite` written with 1-hour retention when reported. */
   cacheWrite1h?: number;
   /** Exact context snapshot for the final provider iteration. */