diff --git a/CHANGELOG.md b/CHANGELOG.md
index a28d77485..69ebd1acc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -71,6 +71,7 @@
 - Control UI: standardize UI build instructions on `bun run ui:*` (fallback supported).
 - Status: show runtime (docker/direct) and move shortcuts to `/help`.
 - Status: show model auth source (api-key/oauth).
+- Status: fix zero token counters for Anthropic (Opus) sessions by normalizing usage fields and ignoring empty usage updates.
 - Block streaming: avoid splitting Markdown fenced blocks and reopen fences when forced to split.
 - Block streaming: preserve leading indentation in block replies (lists, indented fences).
 - Docs: document systemd lingering and logged-in session requirements on macOS/Windows.
diff --git a/src/agents/pi-embedded-runner.ts b/src/agents/pi-embedded-runner.ts
index 982c702a4..813a4ba0d 100644
--- a/src/agents/pi-embedded-runner.ts
+++ b/src/agents/pi-embedded-runner.ts
@@ -65,6 +65,7 @@ import {
   type SkillSnapshot,
 } from "./skills.js";
 import { buildAgentSystemPromptAppend } from "./system-prompt.js";
+import { normalizeUsage, type UsageLike } from "./usage.js";
 import { loadWorkspaceBootstrapFiles } from "./workspace.js";
 
 export type EmbeddedPiAgentMeta = {
@@ -1000,20 +1001,12 @@ export async function runEmbeddedPiAgent(params: {
             }
           }
 
-          const usage = lastAssistant?.usage;
+          const usage = normalizeUsage(lastAssistant?.usage as UsageLike);
           const agentMeta: EmbeddedPiAgentMeta = {
             sessionId: sessionIdUsed,
             provider: lastAssistant?.provider ?? provider,
             model: lastAssistant?.model ?? model.id,
-            usage: usage
-              ? {
-                  input: usage.input,
-                  output: usage.output,
-                  cacheRead: usage.cacheRead,
-                  cacheWrite: usage.cacheWrite,
-                  total: usage.totalTokens,
-                }
-              : undefined,
+            usage,
           };
 
           const replyItems: Array<{ text: string; media?: string[] }> = [];
diff --git a/src/agents/usage.test.ts b/src/agents/usage.test.ts
new file mode 100644
index 000000000..f0b0d53b4
--- /dev/null
+++ b/src/agents/usage.test.ts
@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+
+import { hasNonzeroUsage, normalizeUsage } from "./usage.js";
+
+describe("normalizeUsage", () => {
+  it("normalizes Anthropic-style snake_case usage", () => {
+    const usage = normalizeUsage({
+      input_tokens: 1200,
+      output_tokens: 340,
+      cache_creation_input_tokens: 200,
+      cache_read_input_tokens: 50,
+      total_tokens: 1790,
+    });
+    expect(usage).toEqual({
+      input: 1200,
+      output: 340,
+      cacheRead: 50,
+      cacheWrite: 200,
+      total: 1790,
+    });
+  });
+
+  it("normalizes OpenAI-style prompt/completion usage", () => {
+    const usage = normalizeUsage({
+      prompt_tokens: 987,
+      completion_tokens: 123,
+      total_tokens: 1110,
+    });
+    expect(usage).toEqual({
+      input: 987,
+      output: 123,
+      cacheRead: undefined,
+      cacheWrite: undefined,
+      total: 1110,
+    });
+  });
+
+  it("returns undefined for empty usage objects", () => {
+    expect(normalizeUsage({})).toBeUndefined();
+  });
+
+  it("guards against empty/zero usage overwrites", () => {
+    expect(hasNonzeroUsage(undefined)).toBe(false);
+    expect(hasNonzeroUsage(null)).toBe(false);
+    expect(hasNonzeroUsage({})).toBe(false);
+    expect(hasNonzeroUsage({ input: 0, output: 0 })).toBe(false);
+    expect(hasNonzeroUsage({ input: 1 })).toBe(true);
+    expect(hasNonzeroUsage({ total: 1 })).toBe(true);
+  });
+});
diff --git a/src/agents/usage.ts b/src/agents/usage.ts
index bc33a942b..45189bd01 100644
--- a/src/agents/usage.ts
+++ b/src/agents/usage.ts
@@ -4,6 +4,17 @@ export type UsageLike = {
   cacheRead?: number;
   cacheWrite?: number;
   total?: number;
+  // Common alternates across providers/SDKs.
+  inputTokens?: number;
+  outputTokens?: number;
+  promptTokens?: number;
+  completionTokens?: number;
+  input_tokens?: number;
+  output_tokens?: number;
+  prompt_tokens?: number;
+  completion_tokens?: number;
+  cache_read_input_tokens?: number;
+  cache_creation_input_tokens?: number;
   // Some agents/logs emit alternate naming.
   totalTokens?: number;
   total_tokens?: number;
@@ -11,27 +22,58 @@ export type UsageLike = {
   cache_write?: number;
 };
 
+export type NormalizedUsage = {
+  input?: number;
+  output?: number;
+  cacheRead?: number;
+  cacheWrite?: number;
+  total?: number;
+};
+
 const asFiniteNumber = (value: unknown): number | undefined => {
   if (typeof value !== "number") return undefined;
   if (!Number.isFinite(value)) return undefined;
   return value;
 };
 
+export function hasNonzeroUsage(
+  usage?: NormalizedUsage | null,
+): usage is NormalizedUsage {
+  if (!usage) return false;
+  return [
+    usage.input,
+    usage.output,
+    usage.cacheRead,
+    usage.cacheWrite,
+    usage.total,
+  ].some((v) => typeof v === "number" && Number.isFinite(v) && v > 0);
+}
+
 export function normalizeUsage(raw?: UsageLike | null):
-  | {
-      input?: number;
-      output?: number;
-      cacheRead?: number;
-      cacheWrite?: number;
-      total?: number;
-    }
+  | NormalizedUsage
   | undefined {
   if (!raw) return undefined;
 
-  const input = asFiniteNumber(raw.input);
-  const output = asFiniteNumber(raw.output);
-  const cacheRead = asFiniteNumber(raw.cacheRead ?? raw.cache_read);
-  const cacheWrite = asFiniteNumber(raw.cacheWrite ?? raw.cache_write);
+  const input = asFiniteNumber(
+    raw.input ??
+      raw.inputTokens ??
+      raw.input_tokens ??
+      raw.promptTokens ??
+      raw.prompt_tokens,
+  );
+  const output = asFiniteNumber(
+    raw.output ??
+      raw.outputTokens ??
+      raw.output_tokens ??
+      raw.completionTokens ??
+      raw.completion_tokens,
+  );
+  const cacheRead = asFiniteNumber(
+    raw.cacheRead ?? raw.cache_read ?? raw.cache_read_input_tokens,
+  );
+  const cacheWrite = asFiniteNumber(
+    raw.cacheWrite ?? raw.cache_write ?? raw.cache_creation_input_tokens,
+  );
   const total = asFiniteNumber(
     raw.total ?? raw.totalTokens ?? raw.total_tokens,
   );
diff --git a/src/auto-reply/reply/agent-runner.ts b/src/auto-reply/reply/agent-runner.ts
index 29fab4b55..e7ee357e6 100644
--- a/src/auto-reply/reply/agent-runner.ts
+++ b/src/auto-reply/reply/agent-runner.ts
@@ -6,6 +6,7 @@ import {
   queueEmbeddedPiMessage,
   runEmbeddedPiAgent,
 } from "../../agents/pi-embedded.js";
+import { hasNonzeroUsage } from "../../agents/usage.js";
 import {
   loadSessionStore,
   type SessionEntry,
@@ -450,7 +451,7 @@ export async function runReplyAgent(params: {
         sessionEntry?.contextTokens ??
         DEFAULT_CONTEXT_TOKENS;
 
-      if (usage) {
+      if (hasNonzeroUsage(usage)) {
         const entry = sessionEntry ?? sessionStore[sessionKey];
         if (entry) {
           const input = usage.input ?? 0;
diff --git a/src/auto-reply/reply/followup-runner.ts b/src/auto-reply/reply/followup-runner.ts
index a6cb82da9..71e183263 100644
--- a/src/auto-reply/reply/followup-runner.ts
+++ b/src/auto-reply/reply/followup-runner.ts
@@ -3,6 +3,7 @@ import { lookupContextTokens } from "../../agents/context.js";
 import { DEFAULT_CONTEXT_TOKENS } from "../../agents/defaults.js";
 import { runWithModelFallback } from "../../agents/model-fallback.js";
 import { runEmbeddedPiAgent } from "../../agents/pi-embedded.js";
+import { hasNonzeroUsage } from "../../agents/usage.js";
 import { type SessionEntry, saveSessionStore } from "../../config/sessions.js";
 import { logVerbose } from "../../globals.js";
 import { registerAgentRunContext } from "../../infra/agent-events.js";
@@ -171,7 +172,7 @@ export function createFollowupRunner(params: {
           sessionEntry?.contextTokens ??
           DEFAULT_CONTEXT_TOKENS;
 
-        if (usage) {
+        if (hasNonzeroUsage(usage)) {
           const entry = sessionStore[sessionKey];
           if (entry) {
             const input = usage.input ?? 0;
diff --git a/src/commands/agent.ts b/src/commands/agent.ts
index 32e2f0ed5..d96d98aea 100644
--- a/src/commands/agent.ts
+++ b/src/commands/agent.ts
@@ -17,6 +17,7 @@ import {
 import { runEmbeddedPiAgent } from "../agents/pi-embedded.js";
 import { buildWorkspaceSkillSnapshot } from "../agents/skills.js";
 import { resolveAgentTimeoutMs } from "../agents/timeout.js";
+import { hasNonzeroUsage } from "../agents/usage.js";
 import {
   DEFAULT_AGENT_WORKSPACE_DIR,
   ensureAgentWorkspace,
@@ -482,7 +483,7 @@ export async function agentCommand(
       contextTokens,
     };
     next.abortedLastRun = result.meta.aborted ?? false;
-    if (usage) {
+    if (hasNonzeroUsage(usage)) {
       const input = usage.input ?? 0;
       const output = usage.output ?? 0;
       const promptTokens =
diff --git a/src/cron/isolated-agent.ts b/src/cron/isolated-agent.ts
index bd495b395..a6dc11eed 100644
--- a/src/cron/isolated-agent.ts
+++ b/src/cron/isolated-agent.ts
@@ -14,6 +14,7 @@ import {
 import { runEmbeddedPiAgent } from "../agents/pi-embedded.js";
 import { buildWorkspaceSkillSnapshot } from "../agents/skills.js";
 import { resolveAgentTimeoutMs } from "../agents/timeout.js";
+import { hasNonzeroUsage } from "../agents/usage.js";
 import {
   DEFAULT_AGENT_WORKSPACE_DIR,
   ensureAgentWorkspace,
@@ -357,7 +358,7 @@ export async function runCronIsolatedAgentTurn(params: {
     cronSession.sessionEntry.modelProvider = providerUsed;
     cronSession.sessionEntry.model = modelUsed;
     cronSession.sessionEntry.contextTokens = contextTokens;
-    if (usage) {
+    if (hasNonzeroUsage(usage)) {
       const input = usage.input ?? 0;
       const output = usage.output ?? 0;
       const promptTokens =