diff --git a/assemblyai/__version__.py b/assemblyai/__version__.py
index f49459c..51bbb3f 100644
--- a/assemblyai/__version__.py
+++ b/assemblyai/__version__.py
@@ -1 +1 @@
-__version__ = "1.6.1"
+__version__ = "1.6.2"
diff --git a/assemblyai/types.py b/assemblyai/types.py
index 92377f6..49ce7d9 100644
--- a/assemblyai/types.py
+++ b/assemblyai/types.py
@@ -2908,6 +2908,13 @@ class SyncTranscriptResponse(BaseModel):
     session_id: str
     "Server-generated UUID for this request. Record it to correlate with support."
 
+    language_code: Optional[str] = None
+    """ISO 639-1 language code the model used for this transcript (e.g. ``"en"``
+    for English, ``"es"`` for Spanish). Populated when the server detects or is
+    told the language; ``None`` for responses from servers that predate the field.
+    Useful when ``language_codes`` was not set and you need to know which language
+    the model chose."""
+
     request_time_ms: Optional[float] = None
     """End-to-end server-side request time in milliseconds: queue wait, auth,
     multipart parse, decode, inference, and serialization. ``None`` when the
diff --git a/tests/unit/test_sync.py b/tests/unit/test_sync.py
index 054101c..00d3db4 100644
--- a/tests/unit/test_sync.py
+++ b/tests/unit/test_sync.py
@@ -71,6 +71,40 @@ def test_transcribe_parses_response_without_request_time(httpx_mock: HTTPXMock):
     assert result.request_time_ms is None
 
 
+def test_transcribe_parses_language_code(httpx_mock: HTTPXMock):
+    # Given a server response that includes the language_code field
+    response = {**_OK_RESPONSE, "language_code": "es"}
+    httpx_mock.add_response(
+        url=TRANSCRIBE_URL,
+        method="POST",
+        status_code=httpx.codes.OK,
+        json=response,
+    )
+
+    # When transcribing
+    result = aai.SyncTranscriber().transcribe(b"RIFFfake-wav-bytes")
+
+    # Then language_code is surfaced on the response
+    assert result.language_code == "es"
+
+
+def test_transcribe_parses_response_without_language_code(httpx_mock: HTTPXMock):
+    # Given a server response that predates the language_code field
+    response = {k: v for k, v in _OK_RESPONSE.items() if k != "language_code"}
+    httpx_mock.add_response(
+        url=TRANSCRIBE_URL,
+        method="POST",
+        status_code=httpx.codes.OK,
+        json=response,
+    )
+
+    # When transcribing
+    result = aai.SyncTranscriber().transcribe(b"RIFFfake-wav-bytes")
+
+    # Then language_code is None instead of a parse failure
+    assert result.language_code is None
+
+
 def test_transcribe_sends_model_header_and_wav_part(httpx_mock: HTTPXMock):
     # Given a mocked sync endpoint
     _mock_ok(httpx_mock)