diff --git a/src/routes/learningAI.js b/src/routes/learningAI.js
index 86f6526..8b18b55 100644
--- a/src/routes/learningAI.js
+++ b/src/routes/learningAI.js
@@ -242,22 +242,44 @@ router.post('/ai-generate', upload.single('file'), async function(req, res) {
     var lastBrace = raw.lastIndexOf('}');
     if (lastBrace !== -1 && lastBrace < raw.length - 1) raw = raw.substring(0, lastBrace + 1);
 
+    // Fix unescaped control characters inside JSON string values.
+    // Models sometimes output literal newlines/tabs inside strings instead of \n \t.
+    function sanitizeJsonString(s) {
+      var inStr = false, escaped = false, out = '';
+      for (var i = 0; i < s.length; i++) {
+        var c = s[i];
+        if (escaped) { out += c; escaped = false; continue; }
+        if (c === '\\' && inStr) { out += c; escaped = true; continue; }
+        if (c === '"') { inStr = !inStr; out += c; continue; }
+        if (inStr && c === '\n') { out += '\\n'; continue; }
+        if (inStr && c === '\r') { continue; }
+        if (inStr && c === '\t') { out += '\\t'; continue; }
+        out += c;
+      }
+      return out;
+    }
+
     var parsed;
     try {
       parsed = JSON.parse(raw);
     } catch (e) {
-      // Try extracting from first { to last }
-      var firstBrace = raw.indexOf('{');
-      var extractedJson = firstBrace >= 0 ? raw.substring(firstBrace, lastBrace + 1) : null;
-      if (extractedJson) {
-        try { parsed = JSON.parse(extractedJson); }
-        catch (e2) {
-          console.error('[LearningAI] JSON parse failed. Raw (first 500):', raw.substring(0, 500));
+      console.error('[LearningAI] Direct parse failed:', e.message, '| Pos:', e.message.match(/position (\d+)/)?.[1], '| Char context:', raw.substring(parseInt(e.message.match(/position (\d+)/)?.[1] || 0) - 40, parseInt(e.message.match(/position (\d+)/)?.[1] || 0) + 40));
+      // Attempt 2: sanitize control chars and retry
+      try { parsed = JSON.parse(sanitizeJsonString(raw)); }
+      catch (e2) {
+        // Attempt 3: extract first { to last }
+        var firstBrace = raw.indexOf('{');
+        var extractedJson = firstBrace >= 0 ? raw.substring(firstBrace, lastBrace + 1) : null;
+        if (extractedJson) {
+          try { parsed = JSON.parse(sanitizeJsonString(extractedJson)); }
+          catch (e3) {
+            console.error('[LearningAI] All parse attempts failed:', e3.message);
+            return res.status(500).json({ error: 'AI returned invalid JSON. Try again.' });
+          }
+        } else {
+          console.error('[LearningAI] No JSON braces found');
           return res.status(500).json({ error: 'AI returned invalid JSON. Try again.' });
         }
-      } else {
-        console.error('[LearningAI] No JSON found. Raw (first 500):', raw.substring(0, 500));
-        return res.status(500).json({ error: 'AI returned invalid JSON. Try again.' });
       }
     }