diff --git a/src/ai_server/src/utils.py b/src/ai_server/src/utils.py
index 667f5b0..2cb549f 100644
--- a/src/ai_server/src/utils.py
+++ b/src/ai_server/src/utils.py
@@ -4,6 +4,12 @@
 from dataclasses import dataclass, field
 
 
+DEFAULT_GENERAL_MODEL = "microsoft/Phi-3.5-mini-instruct"
+DEFAULT_VISION_MODEL = "microsoft/Phi-3.5-vision-instruct"
+DEFAULT_CONTENT_EXPANSION_MODEL = "microsoft/Phi-3.5-mini-instruct"
+DEFAULT_GOOGLE_QUERY_TRANSLATOR_MODEL = "microsoft/Phi-3.5-mini-instruct"
+
+
 @dataclass
 class EmbeddingsConfig:
     default_model_group: Optional[str] = "en"
@@ -22,14 +28,14 @@ def __post_init__(self):
 
 @dataclass
 class SamplingParams:
-    temperature: float = 0.8
+    temperature: float = 0.2
     top_p: float = 0.95
     max_tokens: int = 512
 
 
 @dataclass
 class ModelConfig:
-    id: str = "microsoft/Phi-3.5-mini-instruct"
+    id: str = DEFAULT_GENERAL_MODEL
     tensor_parallel_size: int = 1
     sampling_params: SamplingParams = field(default_factory=SamplingParams)
 
@@ -38,23 +44,23 @@ class ModelConfig:
 class LLMs:
     content_expansion: Optional[ModelConfig] = field(
         default_factory=lambda: ModelConfig(
-            id="microsoft/Phi-3.5-mini-instruct",
+            id=DEFAULT_CONTENT_EXPANSION_MODEL,
             tensor_parallel_size=1,
-            sampling_params=SamplingParams(temperature=0.8, top_p=0.95, max_tokens=512),
+            sampling_params=SamplingParams(temperature=0.2, top_p=0.95, max_tokens=512),
         )
     )
     vision: Optional[ModelConfig] = field(
         default_factory=lambda: ModelConfig(
-            id="microsoft/Phi-3.5-vision-instruct",
+            id=DEFAULT_VISION_MODEL,
             tensor_parallel_size=1,
-            sampling_params=SamplingParams(temperature=0.7, top_p=0.95, max_tokens=512),
+            sampling_params=SamplingParams(temperature=0.2, top_p=0.95, max_tokens=512),
         )
     )
     google_query_translator: Optional[ModelConfig] = field(
         default_factory=lambda: ModelConfig(
-            id="microsoft/Phi-3.5-mini-instruct",
+            id=DEFAULT_GOOGLE_QUERY_TRANSLATOR_MODEL,
             tensor_parallel_size=1,
-            sampling_params=SamplingParams(temperature=0.8, top_p=0.95, max_tokens=20),
+            sampling_params=SamplingParams(temperature=0.2, top_p=0.95, max_tokens=20),
         )
     )