diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c59d6bb40..4e7e489afa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@
 
 _Living section — bullets land here as PRs merge into `release/v3.8.47` (parallel-cycle model; cycle opened at the v3.8.46 release freeze). Finalized at the v3.8.47 release._
 
+- **9router Codex import**: the Codex bulk-import endpoint (`POST /api/oauth/codex/import`) now accepts 9router's camelCase account export (`accessToken`/`refreshToken`/`idToken`/`expiresAt` + nested `providerSpecificData`), not just snake_case — `normalizeCodexImportRecord` maps the camelCase aliases onto the existing snake_case keys, filling each only when absent so snake_case/mixed exports keep working unchanged ([#6665](https://github.com/diegosouzapw/OmniRoute/issues/6665)) — thanks @deadcoder0904. Regression guard: `tests/unit/codexBulkImport.test.ts` (9router camelCase record, pre-supplied `providerSpecificData` without an id_token, snake_case-not-overridden, and a full `{accounts:[...]}` flatten).
+
 ### ✨ New Features
 
 - **Provider/model param filters**: config-driven parameter denylist/allowlist per provider/model with auto-learn from upstream 400s (#6649 — thanks @ThongAccount, closes #6625)
diff --git a/src/lib/oauth/services/codexImport.ts b/src/lib/oauth/services/codexImport.ts
index 955584e3c6..9f5b929d34 100644
--- a/src/lib/oauth/services/codexImport.ts
+++ b/src/lib/oauth/services/codexImport.ts
@@ -138,6 +138,36 @@ function unwrapCodexAuthJson(rec: Record<string, unknown>): Record<string, unkno
   return { ...rec, ...tokens };
 }
 
+/**
+ * Map the camelCase field names used by 9router's Codex account export
+ * (`accessToken`, `refreshToken`, `idToken`, `expiresAt`, and a nested
+ * `providerSpecificData` block) onto the snake_case keys the rest of the
+ * normalizer already understands (#6665). A snake_case key is only filled from
+ * its camelCase alias when it is absent, so a snake_case or mixed export keeps
+ * working unchanged.
+ */
+function applyCamelCaseAliases(
+  rec: Record<string, unknown>,
+): Record<string, unknown> {
+  const out: Record<string, unknown> = { ...rec };
+  const fillFrom = (snake: string, value: unknown) => {
+    if (out[snake] === undefined && typeof value === "string" && value) {
+      out[snake] = value;
+    }
+  };
+  fillFrom("access_token", rec.accessToken);
+  fillFrom("refresh_token", rec.refreshToken);
+  fillFrom("id_token", rec.idToken);
+  fillFrom("expired", rec.expiresAt);
+  const psd = rec.providerSpecificData;
+  if (psd && typeof psd === "object" && !Array.isArray(psd)) {
+    const block = psd as Record<string, unknown>;
+    fillFrom("account_id", block.chatgptAccountId);
+    fillFrom("chatgpt_plan_type", block.chatgptPlanType);
+  }
+  return out;
+}
+
 // ── Public API ────────────────────────────────────────────────────────────────
 
 /**
@@ -151,7 +181,9 @@ export function normalizeCodexImportRecord(input: unknown): NormalizeResult {
     return { ok: false, error: "Record is not an object" };
   }
 
-  const rec = unwrapCodexAuthJson(input as Record<string, unknown>);
+  const rec = applyCamelCaseAliases(
+    unwrapCodexAuthJson(input as Record<string, unknown>),
+  );
 
   // Allow type field to be missing or "codex"; reject anything else explicitly so
   // users don't accidentally import claude/gemini exports through this path.
@@ -181,7 +213,10 @@ export function normalizeCodexImportRecord(input: unknown): NormalizeResult {
     fromJwt.chatgptAccountId,
     rec.account_id as string | undefined,
   );
-  const chatgptPlanType = pickString(fromJwt.chatgptPlanType);
+  const chatgptPlanType = pickString(
+    fromJwt.chatgptPlanType,
+    rec.chatgpt_plan_type as string | undefined,
+  );
 
   const expiresAt =
     parseExpiry(rec.expired) ?? parseAccessTokenExp(accessToken);
diff --git a/tests/unit/codexBulkImport.test.ts b/tests/unit/codexBulkImport.test.ts
index 7551fe330b..9576b83109 100644
--- a/tests/unit/codexBulkImport.test.ts
+++ b/tests/unit/codexBulkImport.test.ts
@@ -243,3 +243,86 @@ describe("flattenCodexImportPayload", () => {
     assert.equal(flattenCodexImportPayload(null).ok, false);
   });
 });
+
+// ── 9router camelCase export (#6665) ────────────────────────────────────────────
+
+describe("9router camelCase Codex export (#6665)", () => {
+  // The exact shape a 9router Codex account export produces (camelCase fields +
+  // nested providerSpecificData), as pasted in issue #6665.
+  const NINEROUTER_RECORD = {
+    accessToken: "access-9r",
+    refreshToken: "refresh-9r",
+    idToken: makeIdToken({
+      email: "jwt-9r@example.com",
+      "https://api.openai.com/auth": {
+        chatgpt_account_id: "acct-jwt-9r",
+        chatgpt_plan_type: "plus",
+      },
+    }),
+    email: "top-9r@example.com",
+    expiresAt: "2026-07-17T13:18:27.000Z",
+    expiresIn: 849516,
+    providerSpecificData: {
+      chatgptAccountId: "acct-psd-9r",
+      chatgptPlanType: "pro",
+    },
+    testStatus: "active",
+    isActive: true,
+    lastRefreshAt: "2026-07-07T17:19:51.150Z",
+  };
+
+  test("normalizes a 9router camelCase record", () => {
+    const result = normalizeCodexImportRecord(NINEROUTER_RECORD);
+    assert.equal(result.ok, true);
+    if (!result.ok) return;
+    const { payload } = result;
+    assert.equal(payload.accessToken, "access-9r");
+    assert.equal(payload.refreshToken, "refresh-9r");
+    assert.equal(payload.idToken, NINEROUTER_RECORD.idToken);
+    // JWT-derived account info wins over the pre-supplied providerSpecificData.
+    assert.equal(payload.email, "jwt-9r@example.com");
+    assert.deepEqual(payload.providerSpecificData, {
+      chatgptAccountId: "acct-jwt-9r",
+      chatgptPlanType: "plus",
+    });
+    // camelCase `expiresAt` is honored as the expiry source.
+    assert.equal(Date.parse(payload.expiresAt), Date.parse(NINEROUTER_RECORD.expiresAt));
+  });
+
+  test("uses pre-supplied providerSpecificData when there is no id_token", () => {
+    const result = normalizeCodexImportRecord({
+      accessToken: "a",
+      refreshToken: "r",
+      email: "no-jwt-9r@example.com",
+      providerSpecificData: { chatgptAccountId: "acct-psd", chatgptPlanType: "team" },
+    });
+    assert.equal(result.ok, true);
+    if (!result.ok) return;
+    assert.equal(result.payload.email, "no-jwt-9r@example.com");
+    assert.deepEqual(result.payload.providerSpecificData, {
+      chatgptAccountId: "acct-psd",
+      chatgptPlanType: "team",
+    });
+  });
+
+  test("an explicit snake_case field is NOT overridden by a camelCase alias", () => {
+    const result = normalizeCodexImportRecord({
+      access_token: "snake-wins",
+      accessToken: "camel-loses",
+      refresh_token: "r",
+      email: "mixed@example.com",
+    });
+    assert.equal(result.ok, true);
+    if (!result.ok) return;
+    assert.equal(result.payload.accessToken, "snake-wins");
+  });
+
+  test("a full 9router {accounts:[...]} export flattens to its records", () => {
+    const flat = flattenCodexImportPayload([NINEROUTER_RECORD]);
+    assert.equal(flat.ok, true);
+    if (!flat.ok) return;
+    assert.equal(flat.records.length, 1);
+    const norm = normalizeCodexImportRecord(flat.records[0]);
+    assert.equal(norm.ok, true);
+  });
+});