diff --git a/src/vocalinux/utils/vosk_model_info.py b/src/vocalinux/utils/vosk_model_info.py
index 305f4e1..526ff94 100644
--- a/src/vocalinux/utils/vosk_model_info.py
+++ b/src/vocalinux/utils/vosk_model_info.py
@@ -196,6 +196,34 @@ SUPPORTED_LANGUAGES = {
 }
 
 
+# medium and large ship the same best-available table. Each entry gets a copy so
+# no caller can change one size's languages through the other.
+_BEST_AVAILABLE_LANGUAGES: dict[str, str] = {
+    "en-us": "vosk-model-en-us-0.22",
+    "en-in": "vosk-model-en-in-0.5",
+    "ar": "vosk-model-ar-0.22-linto-1.1.0",
+    "ca": "vosk-model-small-ca-0.4",
+    "zh": "vosk-model-cn-0.22",
+    "cs": "vosk-model-small-cs-0.4-rhasspy",
+    "nl": "vosk-model-nl-spraakherkenning-0.6",
+    "fr": "vosk-model-fr-0.22",
+    "de": "vosk-model-de-0.21",
+    "hi": "vosk-model-hi-0.22",
+    "it": "vosk-model-it-0.22",
+    "ja": "vosk-model-ja-0.22",
+    "ko": "vosk-model-small-ko-0.22",
+    "fa": "vosk-model-fa-0.42",
+    "pl": "vosk-model-small-pl-0.22",
+    "pt": "vosk-model-pt-fb-v0.1.1-pruned",
+    "ru": "vosk-model-ru-0.22",
+    "es": "vosk-model-es-0.42",
+    "sv": "vosk-model-small-sv-rhasspy-0.15",
+    "tr": "vosk-model-small-tr-0.3",
+    "uk": "vosk-model-uk-v3",
+    "vi": "vosk-model-vn-0.4",
+}
+
+
 # VOSK model metadata for display and download path resolution.
 # When Alphacephei only ships a small model, medium/large point at that same
 # zip so size selection never resolves to None (issue #550).
@@ -231,58 +259,12 @@ VOSK_MODEL_INFO = {
     "medium": {
         "size_mb": 1500,
         "desc": "Balanced accuracy/speed",
-        "languages": {
-            "en-us": "vosk-model-en-us-0.22",
-            "en-in": "vosk-model-en-in-0.5",
-            "ar": "vosk-model-ar-0.22-linto-1.1.0",
-            "ca": "vosk-model-small-ca-0.4",
-            "zh": "vosk-model-cn-0.22",
-            "cs": "vosk-model-small-cs-0.4-rhasspy",
-            "nl": "vosk-model-nl-spraakherkenning-0.6",
-            "fr": "vosk-model-fr-0.22",
-            "de": "vosk-model-de-0.21",
-            "hi": "vosk-model-hi-0.22",
-            "it": "vosk-model-it-0.22",
-            "ja": "vosk-model-ja-0.22",
-            "ko": "vosk-model-small-ko-0.22",
-            "fa": "vosk-model-fa-0.42",
-            "pl": "vosk-model-small-pl-0.22",
-            "pt": "vosk-model-pt-fb-v0.1.1-pruned",
-            "ru": "vosk-model-ru-0.22",
-            "es": "vosk-model-es-0.42",
-            "sv": "vosk-model-small-sv-rhasspy-0.15",
-            "tr": "vosk-model-small-tr-0.3",
-            "uk": "vosk-model-uk-v3",
-            "vi": "vosk-model-vn-0.4",
-        },
+        "languages": dict(_BEST_AVAILABLE_LANGUAGES),
     },
     "large": {
         "size_mb": 1500,
         "desc": "Same as medium (best available)",
-        "languages": {
-            "en-us": "vosk-model-en-us-0.22",
-            "en-in": "vosk-model-en-in-0.5",
-            "ar": "vosk-model-ar-0.22-linto-1.1.0",
-            "ca": "vosk-model-small-ca-0.4",
-            "zh": "vosk-model-cn-0.22",
-            "cs": "vosk-model-small-cs-0.4-rhasspy",
-            "nl": "vosk-model-nl-spraakherkenning-0.6",
-            "fr": "vosk-model-fr-0.22",
-            "de": "vosk-model-de-0.21",
-            "hi": "vosk-model-hi-0.22",
-            "it": "vosk-model-it-0.22",
-            "ja": "vosk-model-ja-0.22",
-            "ko": "vosk-model-small-ko-0.22",
-            "fa": "vosk-model-fa-0.42",
-            "pl": "vosk-model-small-pl-0.22",
-            "pt": "vosk-model-pt-fb-v0.1.1-pruned",
-            "ru": "vosk-model-ru-0.22",
-            "es": "vosk-model-es-0.42",
-            "sv": "vosk-model-small-sv-rhasspy-0.15",
-            "tr": "vosk-model-small-tr-0.3",
-            "uk": "vosk-model-uk-v3",
-            "vi": "vosk-model-vn-0.4",
-        },
+        "languages": dict(_BEST_AVAILABLE_LANGUAGES),
     },
 }