diff --git a/src/google/adk/agents/llm_agent.py b/src/google/adk/agents/llm_agent.py
index 35c529474e..d9972ffece 100644
--- a/src/google/adk/agents/llm_agent.py
+++ b/src/google/adk/agents/llm_agent.py
@@ -36,7 +36,6 @@
 from pydantic import Field
 from pydantic import field_validator
 from pydantic import model_validator
-from pydantic import PrivateAttr
 from typing_extensions import override
 from typing_extensions import TypeAlias
 
@@ -256,14 +255,6 @@ class LlmAgent(BaseAgent, abc.ABC):
   LlmAgent.set_default_model. The built-in default is gemini-3.5-flash.
   """
 
-  _resolved_model: Optional[tuple[str, BaseLlm]] = PrivateAttr(default=None)
-  """The model name last resolved by canonical_model, with its BaseLlm."""
-
-  _resolved_live_model: Optional[tuple[str, BaseLlm]] = PrivateAttr(
-      default=None
-  )
-  """The model name last resolved by canonical_live_model, with its BaseLlm."""
-
   config_type: ClassVar[Type[BaseAgentConfig]] = LlmAgentConfig
   """The config type for this agent.
 
@@ -640,11 +631,7 @@ def canonical_model(self) -> BaseLlm:
     if isinstance(self.model, BaseLlm):
       return self.model
     elif self.model:  # model is non-empty str
-      resolved = self._resolved_model
-      if resolved is None or resolved[0] != self.model:
-        resolved = (self.model, LLMRegistry.new_llm(self.model))
-        self._resolved_model = resolved
-      return resolved[1]
+      return LLMRegistry.new_llm(self.model)
     else:  # find model from ancestors.
       ancestor_agent = self.parent_agent
       while ancestor_agent is not None:
@@ -662,11 +649,7 @@ def canonical_live_model(self) -> BaseLlm:
     if isinstance(self.model, BaseLlm):
       return self.model
     elif self.model:  # model is non-empty str
-      resolved = self._resolved_live_model
-      if resolved is None or resolved[0] != self.model:
-        resolved = (self.model, LLMRegistry.new_llm(self.model))
-        self._resolved_live_model = resolved
-      return resolved[1]
+      return LLMRegistry.new_llm(self.model)
     else:  # find model from ancestors.
       ancestor_agent = self.parent_agent
       while ancestor_agent is not None:
diff --git a/tests/unittests/agents/test_llm_agent_fields.py b/tests/unittests/agents/test_llm_agent_fields.py
index bc87106149..e0bb0d6bb3 100644
--- a/tests/unittests/agents/test_llm_agent_fields.py
+++ b/tests/unittests/agents/test_llm_agent_fields.py
@@ -101,31 +101,6 @@ def test_canonical_model_inherit():
   assert sub_agent.canonical_model == parent_agent.canonical_model
 
 
-def test_canonical_model_str_resolved_once():
-  agent = LlmAgent(name='test_agent', model='gemini-pro')
-
-  with mock.patch.object(
-      LLMRegistry, 'new_llm', wraps=LLMRegistry.new_llm
-  ) as new_llm:
-    first = agent.canonical_model
-    second = agent.canonical_model
-    third = agent.canonical_model
-
-  assert new_llm.call_count == 1
-  assert first is second is third
-
-
-def test_canonical_model_str_resolved_again_after_reassignment():
-  agent = LlmAgent(name='test_agent', model='gemini-pro')
-  first = agent.canonical_model
-
-  agent.model = 'gemini-2.5-flash'
-  second = agent.canonical_model
-
-  assert second is not first
-  assert second.model == 'gemini-2.5-flash'
-
-
 def test_canonical_model_str_not_stale_after_model_copy():
   agent = LlmAgent(name='test_agent', model='gemini-pro')
   assert agent.canonical_model.model == 'gemini-pro'
@@ -136,19 +111,6 @@ def test_canonical_model_str_not_stale_after_model_copy():
   assert agent.canonical_model.model == 'gemini-pro'
 
 
-def test_canonical_live_model_str_resolved_once():
-  agent = LlmAgent(name='test_agent', model='gemini-pro')
-
-  with mock.patch.object(
-      LLMRegistry, 'new_llm', wraps=LLMRegistry.new_llm
-  ) as new_llm:
-    first = agent.canonical_live_model
-    second = agent.canonical_live_model
-
-  assert new_llm.call_count == 1
-  assert first is second
-
-
 def test_canonical_live_model_default_fallback():
   original_default = LlmAgent._default_live_model
   LlmAgent.set_default_live_model('gemini-2.0-flash')