diff --git a/open-sse/handlers/chatCore.js b/open-sse/handlers/chatCore.js
index 16f01c03..af62dbae 100644
--- a/open-sse/handlers/chatCore.js
+++ b/open-sse/handlers/chatCore.js
@@ -39,7 +39,16 @@ export async function handleChatCore({ body, modelInfo, credentials, log, onCred
 
   const clientRequestedStreaming = body.stream === true || sourceFormat === FORMATS.ANTIGRAVITY || sourceFormat === FORMATS.GEMINI || sourceFormat === FORMATS.GEMINI_CLI;
   const providerRequiresStreaming = provider === "openai" || provider === "codex";
-  const stream = providerRequiresStreaming ? true : (body.stream !== false);
+  let stream = providerRequiresStreaming ? true : (body.stream !== false);
+
+  // Check client Accept header preference for non-streaming requests
+  // This fixes AI SDK compatibility where clients send Accept: application/json
+  const acceptHeader = clientRawRequest?.headers?.accept || "";
+  const clientPrefersJson = acceptHeader.includes("application/json");
+  const clientPrefersSSE = acceptHeader.includes("text/event-stream");
+  if (clientPrefersJson && !clientPrefersSSE && body.stream !== true) {
+    stream = false;
+  }
 
   const reqLogger = await createRequestLogger(sourceFormat, targetFormat, model);
   if (clientRawRequest) reqLogger.logClientRawRequest(clientRawRequest.endpoint, clientRawRequest.body, clientRawRequest.headers);
diff --git a/open-sse/handlers/chatCore/nonStreamingHandler.js b/open-sse/handlers/chatCore/nonStreamingHandler.js
index 62efc03d..4d202354 100644
--- a/open-sse/handlers/chatCore/nonStreamingHandler.js
+++ b/open-sse/handlers/chatCore/nonStreamingHandler.js
@@ -77,8 +77,11 @@ export function translateNonStreamingResponse(responseBody, targetFormat, source
     const toolCalls = [];
 
     for (const block of responseBody.content) {
-      if (block.type === "text") textContent += block.text;
-      else if (block.type === "thinking") thinkingContent += block.thinking || "";
+      if (block.type === "text") {
+        // Strip markdown code block markers (e.g. kimi wraps JSON in ```json...```)
+        const text = block.text.replace(/^\s*```\s*json\s*\n?/i, "").replace(/\n?\s*```\s*$/i, "");
+        textContent += text;
+      } else if (block.type === "thinking") thinkingContent += block.thinking || "";
       else if (block.type === "tool_use") {
         toolCalls.push({ id: block.id, type: "function", function: { name: block.name, arguments: JSON.stringify(block.input || {}) } });
       }