use original base model template

chat_template.jinja

@@ -3,7 +3,7 @@
   following kwargs:
   - "builtin_tools": A list, can contain "browser" and/or "python".
   - "model_identity": A string that optionally describes the model identity.
-  - "reasoning_effort": A string that describes the reasoning effort, defaults to "low".
+  - "reasoning_effort": A string that describes the reasoning effort, defaults to "medium".
  #}
 
 {#- Tool Definition Rendering ============================================== #}
@@ -201,7 +201,7 @@
     {{- "Knowledge cutoff: 2024-06\n" }}
     {{- "Current date: " + strftime_now("%Y-%m-%d") + "\n\n" }}
     {%- if reasoning_effort is not defined %}
-        {%- set reasoning_effort = "low" %}
+        {%- set reasoning_effort = "medium" %}
     {%- endif %}
     {{- "Reasoning: " + reasoning_effort + "\n\n" }}
     {%- if builtin_tools %}
@@ -327,5 +327,5 @@
 
 {#- Generation prompt #}
 {%- if add_generation_prompt -%}
-<|start|>assistant<|channel|>final<|message|>
+<|start|>assistant
 {%- endif -%}