reasoning_content -> reasoning (#27752)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/entrypoints/openai/test_chat_with_tool_reasoning.py

@@ -80,7 +80,7 @@ FUNC_ARGS = """{"city": "Dallas", "state": "TX", "unit": "fahrenheit"}"""
 
 
 def extract_reasoning_and_calls(chunks: list):
-    reasoning_content = ""
+    reasoning = ""
     tool_call_idx = -1
     arguments = []
     function_names = []
@@ -99,9 +99,9 @@ def extract_reasoning_and_calls(chunks: list):
                 if tool_call.function.arguments:
                     arguments[tool_call_idx] += tool_call.function.arguments
         else:
-            if hasattr(chunk.choices[0].delta, "reasoning_content"):
-                reasoning_content += chunk.choices[0].delta.reasoning_content
-    return reasoning_content, arguments, function_names
+            if hasattr(chunk.choices[0].delta, "reasoning"):
+                reasoning += chunk.choices[0].delta.reasoning
+    return reasoning, arguments, function_names
 
 
 # test streaming
@@ -119,8 +119,8 @@ async def test_chat_streaming_of_tool_and_reasoning(client: openai.AsyncOpenAI):
     async for chunk in stream:
         chunks.append(chunk)
 
-    reasoning_content, arguments, function_names = extract_reasoning_and_calls(chunks)
-    assert len(reasoning_content) > 0
+    reasoning, arguments, function_names = extract_reasoning_and_calls(chunks)
+    assert len(reasoning) > 0
     assert len(function_names) > 0 and function_names[0] == FUNC_NAME
     assert len(arguments) > 0 and arguments[0] == FUNC_ARGS
 
@@ -136,6 +136,6 @@ async def test_chat_full_of_tool_and_reasoning(client: openai.AsyncOpenAI):
         stream=False,
     )
 
-    assert len(tool_calls.choices[0].message.reasoning_content) > 0
+    assert len(tool_calls.choices[0].message.reasoning) > 0
     assert tool_calls.choices[0].message.tool_calls[0].function.name == FUNC_NAME
     assert tool_calls.choices[0].message.tool_calls[0].function.arguments == FUNC_ARGS