diff --git a/src/gateway/server-methods/chat-webchat-media.test.ts b/src/gateway/server-methods/chat-webchat-media.test.ts
index 67de5784ede..ae41dd9bed2 100644
--- a/src/gateway/server-methods/chat-webchat-media.test.ts
+++ b/src/gateway/server-methods/chat-webchat-media.test.ts
@@ -43,6 +43,26 @@ describe("buildWebchatAudioContentBlocksFromReplyPayloads", () => {
     );
   });
 
+  it("suppresses reasoning payload audio", async () => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "openclaw-webchat-audio-"));
+    const audioPath = path.join(tmpDir, "clip.mp3");
+    fs.writeFileSync(audioPath, Buffer.from([0xff, 0xfb, 0x90, 0x00]));
+
+    const blocks = await buildWebchatAudioContentBlocksFromReplyPayloads(
+      [
+        {
+          text: "Reasoning:\n_step_",
+          mediaUrl: audioPath,
+          trustedLocalMedia: true,
+          isReasoning: true,
+        },
+      ],
+      { localRoots: [tmpDir] },
+    );
+
+    expect(blocks).toHaveLength(0);
+  });
+
   it("skips remote URLs", async () => {
     const blocks = await buildWebchatAudioContentBlocksFromReplyPayloads([
       { mediaUrl: "https://example.com/a.mp3", trustedLocalMedia: true },
@@ -212,6 +232,18 @@ describe("buildWebchatAssistantMessageFromReplyPayloads", () => {
     });
   });
 
+  it("suppresses reasoning payload media transcripts", async () => {
+    const message = await buildWebchatAssistantMessageFromReplyPayloads([
+      {
+        text: "Reasoning:\n_step_",
+        mediaUrl: "data:image/png;base64,cG5n",
+        isReasoning: true,
+      },
+    ]);
+
+    expect(message).toBeNull();
+  });
+
   it("suppresses control tokens and falls back to synthetic image text", async () => {
     const message = await buildWebchatAssistantMessageFromReplyPayloads([
       {
diff --git a/src/gateway/server-methods/chat-webchat-media.ts b/src/gateway/server-methods/chat-webchat-media.ts
index 06a88fa8939..e1b76902c36 100644
--- a/src/gateway/server-methods/chat-webchat-media.ts
+++ b/src/gateway/server-methods/chat-webchat-media.ts
@@ -162,6 +162,9 @@ export async function buildWebchatAudioContentBlocksFromReplyPayloads(
   const seen = new Set<string>();
   const blocks: Array<Record<string, unknown>> = [];
   for (const payload of payloads) {
+    if (payload.isReasoning === true) {
+      continue;
+    }
     const parts = resolveSendableOutboundReplyParts(payload);
     for (const raw of parts.mediaUrls) {
       const url = raw.trim();
@@ -194,6 +197,9 @@ export async function buildWebchatAssistantMessageFromReplyPayloads(
   let hasImage = false;
 
   for (const payload of payloads) {
+    if (payload.isReasoning === true) {
+      continue;
+    }
     const visibleText = payload.text?.trim();
     const text =
       visibleText && !isSuppressedControlReplyText(visibleText) ? visibleText : undefined;
diff --git a/src/gateway/server-methods/chat.directive-tags.test.ts b/src/gateway/server-methods/chat.directive-tags.test.ts
index 7fd3f213c23..ed78955c645 100644
--- a/src/gateway/server-methods/chat.directive-tags.test.ts
+++ b/src/gateway/server-methods/chat.directive-tags.test.ts
@@ -26,6 +26,7 @@ const mockState = vi.hoisted(() => ({
     sensitiveMedia?: boolean;
     replyToId?: string;
     replyToCurrent?: boolean;
+    isReasoning?: boolean;
   } | null,
   dispatchedReplies: [] as Array<{
     kind: "tool" | "block" | "final";
@@ -36,6 +37,7 @@ const mockState = vi.hoisted(() => ({
       trustedLocalMedia?: boolean;
       replyToId?: string;
       replyToCurrent?: boolean;
+      isReasoning?: boolean;
     };
   }>,
   dispatchError: null as Error | null,
@@ -114,6 +116,7 @@ vi.mock("../../auto-reply/dispatch.js", () => ({
           sensitiveMedia?: boolean;
           replyToId?: string;
           replyToCurrent?: boolean;
+          isReasoning?: boolean;
         }) => boolean;
         sendBlockReply: (payload: {
           text?: string;
@@ -122,6 +125,7 @@ vi.mock("../../auto-reply/dispatch.js", () => ({
           trustedLocalMedia?: boolean;
           replyToId?: string;
           replyToCurrent?: boolean;
+          isReasoning?: boolean;
         }) => boolean;
         sendToolResult: (payload: {
           text?: string;
@@ -130,6 +134,7 @@ vi.mock("../../auto-reply/dispatch.js", () => ({
           trustedLocalMedia?: boolean;
           replyToId?: string;
           replyToCurrent?: boolean;
+          isReasoning?: boolean;
         }) => boolean;
         markComplete: () => void;
         waitForIdle: () => Promise<void>;
@@ -599,6 +604,31 @@ describe("chat directive tag stripping for non-streaming final payloads", () =>
     expect(JSON.stringify(payload?.message)).not.toContain("MEDIA:data:image/png;base64,cG5n");
   });
 
+  it("suppresses reasoning payloads from webchat transcript replies", async () => {
+    createTranscriptFixture("openclaw-chat-send-reasoning-hidden-");
+    mockState.dispatchedReplies = [
+      {
+        kind: "final",
+        payload: { text: "Reasoning:\n_step_", isReasoning: true },
+      },
+      {
+        kind: "final",
+        payload: { text: "final answer" },
+      },
+    ];
+    const respond = vi.fn();
+    const context = createChatContext();
+
+    const payload = await runNonStreamingChatSend({
+      context,
+      respond,
+      idempotencyKey: "idem-reasoning-hidden",
+    });
+
+    expect(JSON.stringify(payload?.message)).toContain("final answer");
+    expect(JSON.stringify(payload?.message)).not.toContain("Reasoning");
+  });
+
   it("chat.inject keeps message defined when directive tag is the only content", async () => {
     createTranscriptFixture("openclaw-chat-inject-directive-only-");
     const respond = vi.fn();
diff --git a/src/gateway/server-methods/chat.ts b/src/gateway/server-methods/chat.ts
index 1af9302ddd5..4f1d0769b92 100644
--- a/src/gateway/server-methods/chat.ts
+++ b/src/gateway/server-methods/chat.ts
@@ -131,6 +131,9 @@ type ChatAbortRequester = {
 
 /** True when a reply payload carries at least one media reference (mediaUrl or mediaUrls). */
 function isMediaBearingPayload(payload: ReplyPayload): boolean {
+  if (payload.isReasoning === true) {
+    return false;
+  }
   if (payload.mediaUrl?.trim()) {
     return true;
   }
@@ -227,6 +230,9 @@ type SideResultPayload = {
 function buildTranscriptReplyText(payloads: ReplyPayload[]): string {
   const chunks = payloads
     .map((payload) => {
+      if (payload.isReasoning === true) {
+        return "";
+      }
       const parts = resolveSendableOutboundReplyParts(payload);
       const lines: string[] = [];
       const replyToId = sanitizeReplyDirectiveId(payload.replyToId);
@@ -301,7 +307,10 @@ async function buildAssistantDisplayContentFromReplyPayloads(params: {
   onManagedImagePrepareError?: (message: string) => void;
 }): Promise<AssistantDisplayContentBlock[] | undefined> {
   const rawTextPayloadCount = params.payloads.filter(
-    (payload) => typeof payload.text === "string" && payload.text.trim().length > 0,
+    (payload) =>
+      payload.isReasoning !== true &&
+      typeof payload.text === "string" &&
+      payload.text.trim().length > 0,
   ).length;
   const normalized = normalizeReplyPayloadsForDelivery(params.payloads);
   if (normalized.length === 0) {