diff --git a/packages/core/src/parsing.ts b/packages/core/src/parsing.ts
index b8b34d2..c93b67e 100644
--- a/packages/core/src/parsing.ts
+++ b/packages/core/src/parsing.ts
@@ -296,12 +296,21 @@ function parseCodexJsonInput(value: JsonValue): JsonValue {
   try { return JSON.parse(value); } catch { return value; }
 }
 
-function codexUsage(payload: JsonRecord) {
+interface CodexUsage {
+  inputTokens: number | null;
+  outputTokens: number | null;
+}
+
+function codexUsage(payload: JsonRecord): CodexUsage {
   const usage = payload?.info?.last_token_usage || payload?.info?.total_token_usage || payload?.last_token_usage || null;
-  if (!usage) return {};
+  if (!usage) return { inputTokens: null, outputTokens: null };
   return {
-    inputTokens: usage.input_tokens ?? null,
-    outputTokens: usage.output_tokens ?? null,
+    inputTokens: typeof usage.input_tokens === 'number' && Number.isFinite(usage.input_tokens)
+      ? usage.input_tokens
+      : null,
+    outputTokens: typeof usage.output_tokens === 'number' && Number.isFinite(usage.output_tokens)
+      ? usage.output_tokens
+      : null,
   };
 }
 
diff --git a/packages/core/src/providers/codex.ts b/packages/core/src/providers/codex.ts
index 7111be2..1e9be23 100644
--- a/packages/core/src/providers/codex.ts
+++ b/packages/core/src/providers/codex.ts
@@ -256,9 +256,9 @@ export function* parse(unit: IndexUnit, _cursor: Cursor): Generator<TranscriptRe
       }
       if (payload.type === 'token_count') {
         const usage = codexUsage(payload);
-        if (usage.inputTokens !== null) sm.totalInputTokens = usage.inputTokens;
-        if (usage.outputTokens !== null) sm.totalOutputTokens = usage.outputTokens;
-        if (sm.lastTextAssistantUuid && (usage.inputTokens !== null || usage.outputTokens !== null)) {
+        if (usage.inputTokens != null) sm.totalInputTokens = usage.inputTokens;
+        if (usage.outputTokens != null) sm.totalOutputTokens = usage.outputTokens;
+        if (sm.lastTextAssistantUuid && (usage.inputTokens != null || usage.outputTokens != null)) {
           const rec = msgByUuid.get(sm.lastTextAssistantUuid);
           if (rec) { rec.input_tokens = usage.inputTokens; rec.output_tokens = usage.outputTokens; }
         }
diff --git a/tests/provider-session-detail.test.mjs b/tests/provider-session-detail.test.mjs
index ef124f8..c1aa5b5 100644
--- a/tests/provider-session-detail.test.mjs
+++ b/tests/provider-session-detail.test.mjs
@@ -71,6 +71,42 @@ test('a provider record stream assembles directly into session detail', () => {
   db.close();
 });
 
+test('Codex token_count without usage remains persistable', () => {
+  const threadId = '019e8951-3e7d-7343-a3e3-05bff48a3180';
+  const path = writeCodexFixture([
+    {
+      type: 'session_meta',
+      timestamp: '2026-07-14T12:21:21.000Z',
+      payload: { id: threadId, cwd: '/tmp/demo', timestamp: '2026-07-14T12:21:21.000Z' },
+    },
+    {
+      type: 'event_msg',
+      timestamp: '2026-07-14T12:21:30.000Z',
+      payload: { type: 'agent_message', message: 'hello' },
+    },
+    {
+      type: 'event_msg',
+      timestamp: '2026-07-14T12:21:31.000Z',
+      payload: { type: 'token_count', info: null },
+    },
+  ]);
+  const db = new DatabaseSync(':memory:');
+  db.exec(SCHEMA);
+
+  assert.doesNotThrow(() => {
+    persist(db, { key: path, sessionId: `codex:${threadId}` }, parseCodex({
+      key: path,
+      sessionId: `codex:${threadId}`,
+    }, null));
+  });
+  const usage = db.prepare(
+    'SELECT input_tokens, output_tokens FROM messages WHERE text = ?',
+  ).get('hello');
+  assert.equal(usage.input_tokens, null);
+  assert.equal(usage.output_tokens, null);
+  db.close();
+});
+
 test('provider-classified hidden context never reaches session detail', () => {
   const threadId = '019e8951-3e7d-7343-a3e3-05bff48a317e';
   const path = writeCodexFixture([