diff --git a/open-sse/config/providerModels.js b/open-sse/config/providerModels.js
index 17fc91e..014def7 100644
--- a/open-sse/config/providerModels.js
+++ b/open-sse/config/providerModels.js
@@ -16,6 +16,7 @@ export const PROVIDER_MODELS = {
     { id: "claude-haiku-4-5-20251001", name: "Claude 4.5 Haiku" },
   ],
   cx: [  // OpenAI Codex
+    { id: "gpt-5.5", name: "GPT 5.5" },
     { id: "gpt-5.4", name: "GPT 5.4" },
     // GPT 5.3 Codex - all thinking levels
     { id: "gpt-5.3-codex", name: "GPT 5.3 Codex" },
diff --git a/open-sse/handlers/chatCore.js b/open-sse/handlers/chatCore.js
index c8254ae..9e95d01 100644
--- a/open-sse/handlers/chatCore.js
+++ b/open-sse/handlers/chatCore.js
@@ -227,7 +227,7 @@ export async function handleChatCore({ body, modelInfo, credentials, log, onCred
 
   // True non-streaming response
   if (!stream) {
-    const result = await handleNonStreamingResponse({ ...sharedCtx, providerResponse, sourceFormat, targetFormat, reqLogger, trackDone, appendLog });
+    const result = await handleNonStreamingResponse({ ...sharedCtx, providerResponse, sourceFormat, targetFormat, reqLogger, toolNameMap, trackDone, appendLog });
     streamController.handleComplete();
     return result;
   }
diff --git a/open-sse/handlers/chatCore/nonStreamingHandler.js b/open-sse/handlers/chatCore/nonStreamingHandler.js
index 93d3d88..61d5cfc 100644
--- a/open-sse/handlers/chatCore/nonStreamingHandler.js
+++ b/open-sse/handlers/chatCore/nonStreamingHandler.js
@@ -7,6 +7,7 @@ import { HTTP_STATUS } from "../../config/runtimeConfig.js";
 import { parseSSEToOpenAIResponse } from "./sseToJsonHandler.js";
 import { buildRequestDetail, extractRequestConfig, extractUsageFromResponse, saveUsageStats } from "./requestDetail.js";
 import { appendRequestLog, saveRequestDetail } from "@/lib/usageDb.js";
+import { decloakToolNames } from "../../utils/claudeCloaking.js";
 
 /**
  * Translate non-streaming response body from provider format → OpenAI format.
@@ -127,7 +128,7 @@ export function translateNonStreamingResponse(responseBody, targetFormat, source
 /**
  * Handle non-streaming response from provider.
  */
-export async function handleNonStreamingResponse({ providerResponse, provider, model, sourceFormat, targetFormat, body, stream, translatedBody, finalBody, requestStartTime, connectionId, apiKey, clientRawRequest, onRequestSuccess, reqLogger, trackDone, appendLog }) {
+export async function handleNonStreamingResponse({ providerResponse, provider, model, sourceFormat, targetFormat, body, stream, translatedBody, finalBody, requestStartTime, connectionId, apiKey, clientRawRequest, onRequestSuccess, reqLogger, toolNameMap, trackDone, appendLog }) {
   trackDone();
   const contentType = providerResponse.headers.get("content-type") || "";
   let responseBody;
@@ -153,6 +154,9 @@ export async function handleNonStreamingResponse({ providerResponse, provider, m
   reqLogger.logProviderResponse(providerResponse.status, providerResponse.statusText, providerResponse.headers, responseBody);
   if (onRequestSuccess) await onRequestSuccess();
 
+  // Decloak tool_use names once on raw Claude body, before any translation (INPUT side)
+  responseBody = decloakToolNames(responseBody, toolNameMap);
+
   const usage = extractUsageFromResponse(responseBody);
   appendLog({ tokens: usage, status: "200 OK" });
   saveUsageStats({ provider, model, tokens: usage, connectionId, apiKey, endpoint: clientRawRequest?.endpoint });
diff --git a/open-sse/utils/claudeCloaking.js b/open-sse/utils/claudeCloaking.js
index ae64391..2c9d1f2 100644
--- a/open-sse/utils/claudeCloaking.js
+++ b/open-sse/utils/claudeCloaking.js
@@ -66,6 +66,18 @@ export function cloakClaudeTools(body) {
   };
 }
 
+// Decloak tool_use names in non-streaming Claude response body (INPUT side)
+export function decloakToolNames(body, toolNameMap) {
+  if (!toolNameMap?.size || !Array.isArray(body?.content)) return body;
+  const content = body.content.map(block => {
+    if (block?.type === "tool_use" && toolNameMap.has(block.name)) {
+      return { ...block, name: toolNameMap.get(block.name) };
+    }
+    return block;
+  });
+  return { ...body, content };
+}
+
 // CC decoy tools — Claude Code native tool names, marked unavailable
 const CC_DECOY_TOOLS = [
   { name: "Task", description: "This tool is currently unavailable.", input_schema: { type: "object", properties: {} } },