Add support for the newly released OpenAI O1 model series for preview

The O1 series doesn't seem to support streaming, stop words or
temperature, response_format currently.

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

@@ -45,15 +45,28 @@ def completion_with_backoff(
         openai_clients[client_key] = client
 
     formatted_messages = [{"role": message.role, "content": message.content} for message in messages]
+    stream = True
+
+    # Update request parameters for compatability with o1 model series
+    # Refer: https://platform.openai.com/docs/guides/reasoning/beta-limitations
+    if model.startswith("o1"):
+        stream = False
+        temperature = 1
+        model_kwargs.pop("stop", None)
+        model_kwargs.pop("response_format", None)
 
     chat = client.chat.completions.create(
-        stream=True,
+        stream=stream,
         messages=formatted_messages,  # type: ignore
         model=model,  # type: ignore
         temperature=temperature,
         timeout=20,
         **(model_kwargs or dict()),
     )
+
+    if not stream:
+        return chat.choices[0].message.content
+
     aggregated_response = ""
     for chunk in chat:
         if len(chunk.choices) == 0:
@@ -112,9 +125,18 @@ def llm_thread(g, messages, model_name, temperature, openai_api_key=None, api_ba
             client: openai.OpenAI = openai_clients[client_key]
 
         formatted_messages = [{"role": message.role, "content": message.content} for message in messages]
+        stream = True
+
+        # Update request parameters for compatability with o1 model series
+        # Refer: https://platform.openai.com/docs/guides/reasoning/beta-limitations
+        if model_name.startswith("o1"):
+            stream = False
+            temperature = 1
+            model_kwargs.pop("stop", None)
+            model_kwargs.pop("response_format", None)
 
         chat = client.chat.completions.create(
-            stream=True,
+            stream=stream,
             messages=formatted_messages,
             model=model_name,  # type: ignore
             temperature=temperature,
@@ -122,6 +144,9 @@ def llm_thread(g, messages, model_name, temperature, openai_api_key=None, api_ba
             **(model_kwargs or dict()),
         )
 
+        if not stream:
+            g.send(chat.choices[0].message.content)
+        else:
             for chunk in chat:
                 if len(chunk.choices) == 0:
                     continue

src/khoj/processor/conversation/utils.py

@@ -1,4 +1,3 @@
-import json
 import logging
 import math
 import queue
@@ -24,6 +23,8 @@ model_to_prompt_size = {
     "gpt-4-0125-preview": 20000,
     "gpt-4-turbo-preview": 20000,
     "gpt-4o-mini": 20000,
+    "o1-preview": 20000,
+    "o1-mini": 20000,
     "TheBloke/Mistral-7B-Instruct-v0.2-GGUF": 3500,
     "NousResearch/Hermes-2-Pro-Mistral-7B-GGUF": 3500,
     "bartowski/Meta-Llama-3.1-8B-Instruct-GGUF": 20000,
@@ -220,8 +221,9 @@ def truncate_messages(
     try:
         if loaded_model:
             encoder = loaded_model.tokenizer()
-        elif model_name.startswith("gpt-"):
+        elif model_name.startswith("gpt-") or model_name.startswith("o1"):
-            encoder = tiktoken.encoding_for_model(model_name)
+            # as tiktoken doesn't recognize o1 model series yet
+            encoder = tiktoken.encoding_for_model("gpt-4o" if model_name.startswith("o1") else model_name)
         elif tokenizer_name:
             if tokenizer_name in state.pretrained_tokenizers:
                 encoder = state.pretrained_tokenizers[tokenizer_name]
@@ -278,7 +280,9 @@ def truncate_messages(
         )
 
     if system_message:
-        system_message.role = "user" if "gemma-2" in model_name else "system"
+        # Default system message role is system.
+        # Fallback to system message role of user for models that do not support this role like gemma-2 and openai's o1 model series.
+        system_message.role = "user" if "gemma-2" in model_name or model_name.startswith("o1") else "system"
     return messages + [system_message] if system_message else messages