diff --git a/src/config/openclawProviderPresets.ts b/src/config/openclawProviderPresets.ts
index 0115678ca..4d3ea9b85 100644
--- a/src/config/openclawProviderPresets.ts
+++ b/src/config/openclawProviderPresets.ts
@@ -230,7 +230,7 @@ export const openclawProviderPresets: OpenClawProviderPreset[] = [
         {
           id: "doubao-seed-2-1-pro-260628",
           name: "DouBao Seed 2.1 Pro",
-          contextWindow: 128000,
+          contextWindow: 262144,
           cost: { input: 0.84, output: 4.2 },
         },
       ],
diff --git a/tests/config/doubaoSeedPresets.test.ts b/tests/config/doubaoSeedPresets.test.ts
new file mode 100644
index 000000000..5f7215ff8
--- /dev/null
+++ b/tests/config/doubaoSeedPresets.test.ts
@@ -0,0 +1,34 @@
+import { describe, expect, it } from "vitest";
+import { codexProviderPresets } from "@/config/codexProviderPresets";
+import { openclawProviderPresets } from "@/config/openclawProviderPresets";
+
+// 回归：同一个 doubao 模型在 Codex catalog 与 OpenClaw settingsConfig 里都声明了
+// contextWindow，二者必须一致。曾出现 OpenClaw 写成 128000、Codex 写成 262144 的
+// 漂移，导致 OpenClaw 用户拿到过小的上下文窗口、长上下文提前压缩/截断。
+describe("DouBaoSeed preset consistency across apps", () => {
+  const DOUBAO_MODEL_ID = "doubao-seed-2-1-pro-260628";
+  const EXPECTED_CONTEXT_WINDOW = 262144;
+
+  it("keeps the doubao context window in sync between OpenClaw and Codex", () => {
+    const codexPreset = codexProviderPresets.find(
+      (item) => item.name === "DouBaoSeed",
+    );
+    const codexModel = (codexPreset?.modelCatalog ?? []).find(
+      (model) => model.model === DOUBAO_MODEL_ID,
+    );
+    expect(codexModel, "Codex DouBaoSeed catalog model").toBeDefined();
+    expect(codexModel?.contextWindow).toBe(EXPECTED_CONTEXT_WINDOW);
+
+    const openclawPreset = openclawProviderPresets.find(
+      (item) => item.name === "DouBaoSeed",
+    );
+    const openclawModel = (openclawPreset?.settingsConfig.models ?? []).find(
+      (model) => model.id === DOUBAO_MODEL_ID,
+    );
+    expect(openclawModel, "OpenClaw DouBaoSeed model").toBeDefined();
+    expect(openclawModel?.contextWindow).toBe(EXPECTED_CONTEXT_WINDOW);
+
+    // 任一侧单独改动都会破坏这条等式 —— 这是真正防漂移的断言。
+    expect(openclawModel?.contextWindow).toBe(codexModel?.contextWindow);
+  });
+});