diff --git a/core/session.py b/core/session.py
index 1c7775d..79a73a9 100644
--- a/core/session.py
+++ b/core/session.py
@@ -255,6 +255,27 @@ _KAZAKH_LANGUAGE_MARKERS = frozenset({
     "казак",
     "қазақ",
     "қазақша",
+    "сәлем",
+    "салем",
+    "сәлеметсіз",
+    "салеметсиз",
+    "рахмет",
+    "жақсы",
+    "жаксы",
+    "иә",
+    "ия",
+    "жоқ",
+    "жок",
+    "менің",
+    "менин",
+    "атым",
+    "маған",
+    "маган",
+    "керек",
+    "көмек",
+    "комек",
+    "сұрақ",
+    "сурак",
 })
 _RUSSIAN_LANGUAGE_MARKERS = frozenset({
     "русский",
@@ -296,9 +317,6 @@ def _detect_session_language(text: str) -> str | None:
     has_russian = any(ch in _RUSSIAN_SPECIFIC_LETTERS for ch in normalized)
     if has_russian:
         return "ru"
-    cyrillic_chars = sum(1 for ch in normalized if "а" <= ch <= "я" or ch == "ё")
-    if cyrillic_chars >= 2:
-        return "ru"
     return None
 
 
diff --git a/providers/stt_openai.py b/providers/stt_openai.py
index 4cdd37b..ad9e3db 100644
--- a/providers/stt_openai.py
+++ b/providers/stt_openai.py
@@ -92,7 +92,7 @@ class OpenAISTT(BaseSTT):
         ).strip() or None
         self._input_sample_rate_hz = max(int(input_sample_rate_hz), 1)
         self._prompt = str(prompt if prompt is not None else os.getenv("STT_PROMPT", "")).strip()
-        self._language = str(language if language is not None else os.getenv("OPENAI_STT_LANGUAGE", "ru")).strip() or None
+        self._language = str(language if language is not None else os.getenv("OPENAI_STT_LANGUAGE", "")).strip() or None
         self._timeout_seconds = max(float(timeout_seconds if timeout_seconds is not None else _timeout_seconds()), 1.0)
         self._max_retries = max(int(max_retries if max_retries is not None else _max_retries()), 0)
         self._client: Any | None = None