diff --git a/pyrit/prompt_target/litellm_chat_target.py b/pyrit/prompt_target/litellm_chat_target.py
index 6a5d8bea73..6e0da9ea09 100644
--- a/pyrit/prompt_target/litellm_chat_target.py
+++ b/pyrit/prompt_target/litellm_chat_target.py
@@ -392,6 +392,7 @@ def _build_identifier(self) -> ComponentIdentifier:
                 "seed": self._seed,
                 "n": self._n,
                 "stop": self._stop,
+                "extra_body_parameters": self._extra_body_parameters,
             },
         )
 
diff --git a/pyrit/prompt_target/openai/openai_chat_target.py b/pyrit/prompt_target/openai/openai_chat_target.py
index 23ea5dbe32..fc1ea4070c 100644
--- a/pyrit/prompt_target/openai/openai_chat_target.py
+++ b/pyrit/prompt_target/openai/openai_chat_target.py
@@ -199,6 +199,7 @@ def _build_identifier(self) -> ComponentIdentifier:
                 "presence_penalty": self._presence_penalty,
                 "seed": self._seed,
                 "n": self._n,
+                "extra_body_parameters": self._extra_body_parameters,
             },
         )
 
diff --git a/tests/unit/prompt_target/target/test_litellm_chat_target.py b/tests/unit/prompt_target/target/test_litellm_chat_target.py
index 6c5bbf338b..c935fbd1da 100644
--- a/tests/unit/prompt_target/target/test_litellm_chat_target.py
+++ b/tests/unit/prompt_target/target/test_litellm_chat_target.py
@@ -326,6 +326,14 @@ def test_identifier_includes_behavioral_params_and_excludes_key(patch_central_da
     assert "sk-secret" not in json.dumps(params)
 
 
+@pytest.mark.usefixtures("patch_central_database", "litellm_stub")
+def test_identifier_distinguishes_extra_body_parameters() -> None:
+    low = LiteLLMChatTarget(model_name="openai/gpt-4o", extra_body_parameters={"reasoning_effort": "low"})
+    high = LiteLLMChatTarget(model_name="openai/gpt-4o", extra_body_parameters={"reasoning_effort": "high"})
+    assert low.get_identifier().params["extra_body_parameters"] == {"reasoning_effort": "low"}
+    assert low.get_identifier().hash != high.get_identifier().hash
+
+
 # ---------------------------------------------------------------------------
 # Request body
 # ---------------------------------------------------------------------------
diff --git a/tests/unit/prompt_target/target/test_openai_chat_target.py b/tests/unit/prompt_target/target/test_openai_chat_target.py
index 589b645268..381bd05ce0 100644
--- a/tests/unit/prompt_target/target/test_openai_chat_target.py
+++ b/tests/unit/prompt_target/target/test_openai_chat_target.py
@@ -8,6 +8,7 @@
 from collections.abc import MutableSequence
 from tempfile import NamedTemporaryFile
 from types import SimpleNamespace
+from typing import Any
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import httpx
@@ -1279,6 +1280,22 @@ async def test_construct_message_from_response(target: OpenAIChatTarget, dummy_t
 # Tests for underlying_model parameter and get_identifier
 
 
+@pytest.mark.usefixtures("patch_central_database")
+def test_get_identifier_distinguishes_extra_body_parameters() -> None:
+    def build(**kwargs: Any) -> OpenAIChatTarget:
+        return OpenAIChatTarget(model_name="o4-mini", endpoint="https://mock.azure.com/", api_key="k", **kwargs)
+
+    low = build(extra_body_parameters={"reasoning_effort": "low"})
+    high = build(extra_body_parameters={"reasoning_effort": "high"})
+    alloy = build(audio_response_config=OpenAIChatAudioConfig(voice="alloy"))
+    echo = build(audio_response_config=OpenAIChatAudioConfig(voice="echo"))
+
+    assert low.get_identifier().params["extra_body_parameters"] == {"reasoning_effort": "low"}
+    assert low.get_identifier().hash != high.get_identifier().hash
+    assert alloy.get_identifier().hash != echo.get_identifier().hash
+    assert build().get_identifier().params.get("extra_body_parameters") is None
+
+
 def test_get_identifier_uses_model_name_when_no_underlying_model(patch_central_database):
     """Test that get_identifier uses model_name when underlying_model is not provided."""
     # Clear the environment variable to ensure it doesn't interfere with the test