diff --git a/CHANGELOG.md b/CHANGELOG.md
index f81b88517..71dcb752b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@ Docs: https://docs.openclaw.ai
 - Auto-reply/Sessions: remove auth-key labels from `/new` and `/reset` confirmation messages so session reset notices never expose API key prefixes or env-key labels in chat output. (#24384, #24409) Thanks @Clawborn.
 - Slack/Group policy: move Slack account `groupPolicy` defaulting to provider-level schema defaults so multi-account configs inherit top-level `channels.slack.groupPolicy` instead of silently overriding inheritance with per-account `allowlist`. (#17579) Thanks @ZetiMente.
 - Providers/Anthropic: skip `context-1m-*` beta injection for OAuth/subscription tokens (`sk-ant-oat-*`) while preserving OAuth-required betas, avoiding Anthropic 401 auth failures when `params.context1m` is enabled. (#10647, #20354) Thanks @ClumsyWizardHands and @dcruver.
+- Providers/DashScope: mark DashScope-compatible `openai-completions` endpoints as `supportsDeveloperRole=false` so OpenClaw sends `system` instead of unsupported `developer` role on Qwen/DashScope APIs. (#19130) Thanks @Putzhuawa and @vincentkoc.
 - Providers/Bedrock: disable prompt-cache retention for non-Anthropic Bedrock models so Nova/Mistral requests do not send unsupported cache metadata. (#20866) Thanks @pierreeurope.
 - Providers/Bedrock: apply Anthropic-Claude cacheRetention defaults and runtime pass-through for `amazon-bedrock/*anthropic.claude*` model refs, while keeping non-Anthropic Bedrock models excluded. (#22303) Thanks @snese.
 - Providers/OpenRouter: remove conflicting top-level `reasoning_effort` when injecting nested `reasoning.effort`, preventing OpenRouter 400 payload-validation failures for reasoning models. (#24120) thanks @tenequm.
diff --git a/src/agents/model-compat.test.ts b/src/agents/model-compat.test.ts
index 962724c66..a7404d304 100644
--- a/src/agents/model-compat.test.ts
+++ b/src/agents/model-compat.test.ts
@@ -77,6 +77,32 @@ describe("normalizeModelCompat", () => {
     ).toBe(false);
   });
 
+  it("forces supportsDeveloperRole off for DashScope provider ids", () => {
+    const model = {
+      ...baseModel(),
+      provider: "dashscope",
+      baseUrl: "https://dashscope.aliyuncs.com/compatible-mode/v1",
+    };
+    delete (model as { compat?: unknown }).compat;
+    const normalized = normalizeModelCompat(model);
+    expect(
+      (normalized.compat as { supportsDeveloperRole?: boolean } | undefined)?.supportsDeveloperRole,
+    ).toBe(false);
+  });
+
+  it("forces supportsDeveloperRole off for DashScope-compatible endpoints", () => {
+    const model = {
+      ...baseModel(),
+      provider: "custom-qwen",
+      baseUrl: "https://dashscope-intl.aliyuncs.com/compatible-mode/v1",
+    };
+    delete (model as { compat?: unknown }).compat;
+    const normalized = normalizeModelCompat(model);
+    expect(
+      (normalized.compat as { supportsDeveloperRole?: boolean } | undefined)?.supportsDeveloperRole,
+    ).toBe(false);
+  });
+
   it("leaves non-zai models untouched", () => {
     const model = {
       ...baseModel(),
diff --git a/src/agents/model-compat.ts b/src/agents/model-compat.ts
index d97d39651..2b5eba130 100644
--- a/src/agents/model-compat.ts
+++ b/src/agents/model-compat.ts
@@ -4,6 +4,14 @@ function isOpenAiCompletionsModel(model: Model<Api>): model is Model<"openai-com
   return model.api === "openai-completions";
 }
 
+function isDashScopeCompatibleEndpoint(baseUrl: string): boolean {
+  return (
+    baseUrl.includes("dashscope.aliyuncs.com") ||
+    baseUrl.includes("dashscope-intl.aliyuncs.com") ||
+    baseUrl.includes("dashscope-us.aliyuncs.com")
+  );
+}
+
 export function normalizeModelCompat(model: Model<Api>): Model<Api> {
   const baseUrl = model.baseUrl ?? "";
   const isZai = model.provider === "zai" || baseUrl.includes("api.z.ai");
@@ -11,7 +19,8 @@ export function normalizeModelCompat(model: Model<Api>): Model<Api> {
     model.provider === "moonshot" ||
     baseUrl.includes("moonshot.ai") ||
     baseUrl.includes("moonshot.cn");
-  if ((!isZai && !isMoonshot) || !isOpenAiCompletionsModel(model)) {
+  const isDashScope = model.provider === "dashscope" || isDashScopeCompatibleEndpoint(baseUrl);
+  if ((!isZai && !isMoonshot && !isDashScope) || !isOpenAiCompletionsModel(model)) {
     return model;
   }
 
diff --git a/src/gateway/sessions-patch.test.ts b/src/gateway/sessions-patch.test.ts
index 5d07ea1a1..3d8c575cf 100644
--- a/src/gateway/sessions-patch.test.ts
+++ b/src/gateway/sessions-patch.test.ts
@@ -179,6 +179,38 @@ describe("gateway sessions patch", () => {
     expect(res.entry.authProfileOverrideCompactionCount).toBeUndefined();
   });
 
+  test("accepts explicit allowlisted provider/model refs from sessions.patch", async () => {
+    const store: Record<string, SessionEntry> = {};
+    const cfg = {
+      agents: {
+        defaults: {
+          model: { primary: "openai/gpt-5.2" },
+          models: {
+            "anthropic/claude-sonnet-4-6": { alias: "sonnet" },
+          },
+        },
+      },
+    } as OpenClawConfig;
+
+    const res = await applySessionsPatchToStore({
+      cfg,
+      store,
+      storeKey: "agent:main:main",
+      patch: { key: "agent:main:main", model: "anthropic/claude-sonnet-4-6" },
+      loadGatewayModelCatalog: async () => [
+        { provider: "anthropic", id: "claude-sonnet-4-6", name: "Claude Sonnet 4.6" },
+        { provider: "anthropic", id: "claude-sonnet-4-5", name: "Claude Sonnet 4.5" },
+      ],
+    });
+
+    expect(res.ok).toBe(true);
+    if (!res.ok) {
+      return;
+    }
+    expect(res.entry.providerOverride).toBe("anthropic");
+    expect(res.entry.modelOverride).toBe("claude-sonnet-4-6");
+  });
+
   test("sets spawnDepth for subagent sessions", async () => {
     const store: Record<string, SessionEntry> = {};
     const res = await applySessionsPatchToStore({