diff --git a/litellm/llms/gemini/interactions/transformation.py b/litellm/llms/gemini/interactions/transformation.py
index ab2c1440fb7..0e898147d90 100644
--- a/litellm/llms/gemini/interactions/transformation.py
+++ b/litellm/llms/gemini/interactions/transformation.py
@@ -313,6 +313,12 @@ class GoogleAIStudioInteractionsConfig(BaseInteractionsAPIConfig):
         raw_response: httpx.Response,
         logging_obj: LiteLLMLoggingObj,
     ) -> InteractionsAPIResponse:
+        if not 200 <= raw_response.status_code < 300:
+            raise GeminiError(
+                message=raw_response.text,
+                status_code=raw_response.status_code,
+                headers=dict(raw_response.headers),
+            )
         try:
             raw_json: Final = _interaction_body(raw_response)
         except Exception:
diff --git a/tests/unit/interactions/test_gemini_interactions_transformation.py b/tests/unit/interactions/test_gemini_interactions_transformation.py
index 2809c12ae47..5e394e9f218 100644
--- a/tests/unit/interactions/test_gemini_interactions_transformation.py
+++ b/tests/unit/interactions/test_gemini_interactions_transformation.py
@@ -10,12 +10,13 @@ Covers:
 
 from unittest.mock import MagicMock, patch
 
+import httpx
 import pytest
 
-
 from litellm.interactions.litellm_responses_transformation.streaming_iterator import (
     LiteLLMResponsesInteractionsStreamingIterator,
 )
+from litellm.llms.gemini.common_utils import GeminiError
 from litellm.llms.gemini.interactions.transformation import (
     GoogleAIStudioInteractionsConfig,
 )
@@ -464,6 +465,32 @@ class TestInteractionOperationUrls:
                 )
 
 
+class TestGetInteractionResponse:
+    @pytest.mark.parametrize("status_code", [404, 500])
+    def test_non_2xx_raises_even_when_the_error_body_is_json(
+        self, config: GoogleAIStudioInteractionsConfig, status_code: int
+    ) -> None:
+        raw_response = httpx.Response(
+            status_code,
+            json={"error": {"code": status_code, "message": "boom", "status": "INTERNAL"}},
+            request=httpx.Request("GET", "https://generativelanguage.googleapis.com/v1beta/interactions/x"),
+        )
+        with pytest.raises(GeminiError) as raised:
+            config.transform_get_interaction_response(raw_response=raw_response, logging_obj=MagicMock())
+        assert raised.value.status_code == status_code
+        assert "boom" in str(raised.value)
+
+    def test_2xx_parses_the_interaction(self, config: GoogleAIStudioInteractionsConfig) -> None:
+        raw_response = httpx.Response(
+            200,
+            json={"id": "interaction-1", "object": "interaction", "status": "completed", "steps": []},
+            request=httpx.Request("GET", "https://generativelanguage.googleapis.com/v1beta/interactions/x"),
+        )
+        response = config.transform_get_interaction_response(raw_response=raw_response, logging_obj=MagicMock())
+        assert response.id == "interaction-1"
+        assert response.status == "completed"
+
+
 class TestTransformRequestSchemaCoalescing:
     """Test new-schema request coalescing (Api-Revision: 2026-05-20)."""