Support constraining OpenAI model output to specified response schema

src/khoj/processor/conversation/openai/gpt.py

@@ -121,21 +121,34 @@ def extract_questions(
 
 
 def send_message_to_model(
-    messages, api_key, model, response_type="text", api_base_url=None, temperature=0, tracer: dict = {}
+    messages,
+    api_key,
+    model,
+    response_type="text",
+    response_schema=None,
+    api_base_url=None,
+    temperature=0,
+    tracer: dict = {},
 ):
     """
     Send message to model
     """
 
-    # Get Response from GPT
+    model_kwargs = {}
     json_support = get_openai_api_json_support(model, api_base_url)
+    if response_schema and json_support == JsonSupport.SCHEMA:
+        model_kwargs["response_format"] = response_schema
+    elif response_type == "json_object" and json_support == JsonSupport.OBJECT:
+        model_kwargs["response_format"] = {"type": response_type}
+
+    # Get Response from GPT
     return completion_with_backoff(
         messages=messages,
         model_name=model,
         openai_api_key=api_key,
         temperature=temperature,
         api_base_url=api_base_url,
-        model_kwargs={"response_format": {"type": response_type}} if json_support >= JsonSupport.OBJECT else {},
+        model_kwargs=model_kwargs,
         tracer=tracer,
     )
 

src/khoj/processor/conversation/openai/utils.py

@@ -67,33 +67,24 @@ def completion_with_backoff(
         temperature = 1
         model_kwargs["reasoning_effort"] = "medium"
 
-    stream = True
     model_kwargs["stream_options"] = {"include_usage": True}
     if os.getenv("KHOJ_LLM_SEED"):
         model_kwargs["seed"] = int(os.getenv("KHOJ_LLM_SEED"))
 
-    chat: ChatCompletion | openai.Stream[ChatCompletionChunk] = client.chat.completions.create(
+    aggregated_response = ""
+    with client.beta.chat.completions.stream(
         messages=formatted_messages,  # type: ignore
-        model=model_name,  # type: ignore
-        stream=stream,
+        model=model_name,
         temperature=temperature,
         timeout=20,
         **model_kwargs,
-    )
-
-    aggregated_response = ""
-    if not stream:
-        chunk = chat
-        aggregated_response = chunk.choices[0].message.content
-    else:
+    ) as chat:
         for chunk in chat:
-            if len(chunk.choices) == 0:
+            if chunk.type == "error":
+                logger.error(f"Openai api response error: {chunk.error}", exc_info=True)
                 continue
-            delta_chunk = chunk.choices[0].delta  # type: ignore
-            if isinstance(delta_chunk, str):
-                aggregated_response += delta_chunk
-            elif delta_chunk.content:
-                aggregated_response += delta_chunk.content
+            elif chunk.type == "content.delta":
+                aggregated_response += chunk.delta
 
     # Calculate cost of chat
     input_tokens = chunk.usage.prompt_tokens if hasattr(chunk, "usage") and chunk.usage else 0

src/khoj/routers/helpers.py

@@ -1209,6 +1209,7 @@ async def send_message_to_model_wrapper(
             api_key=api_key,
             model=chat_model_name,
             response_type=response_type,
+            response_schema=response_schema,
             api_base_url=api_base_url,
             tracer=tracer,
         )
@@ -1326,6 +1327,7 @@ def send_message_to_model_wrapper_sync(
             api_base_url=api_base_url,
             model=chat_model_name,
             response_type=response_type,
+            response_schema=response_schema,
             tracer=tracer,
         )