diff --git a/pr_agent/algo/__init__.py b/pr_agent/algo/__init__.py
index 7528be1f..40d4fc07 100644
--- a/pr_agent/algo/__init__.py
+++ b/pr_agent/algo/__init__.py
@@ -30,6 +30,7 @@ MAX_TOKENS = {
     'claude-2': 100000,
     'command-nightly': 4096,
     'deepseek/deepseek-chat': 128000,  # 128K, but may be limited by config.max_model_tokens
+    'deepseek/deepseek-reasoner': 64000,  # 64K, but may be limited by config.max_model_tokens
     'replicate/llama-2-70b-chat:2c1608e18606fad2812020dc541930f2d0495ce32eee50074220b87300bc16e1': 4096,
     'meta-llama/Llama-2-7b-chat-hf': 4096,
     'vertex_ai/codechat-bison': 6144,
diff --git a/pr_agent/algo/ai_handlers/litellm_ai_handler.py b/pr_agent/algo/ai_handlers/litellm_ai_handler.py
index 453973f6..50d14b21 100644
--- a/pr_agent/algo/ai_handlers/litellm_ai_handler.py
+++ b/pr_agent/algo/ai_handlers/litellm_ai_handler.py
@@ -200,10 +200,10 @@ class LiteLLMAIHandler(BaseAiHandler):
             # Currently, model OpenAI o1 series does not support a separate system and user prompts
             O1_MODEL_PREFIX = 'o1'
             model_type = model.split('/')[-1] if '/' in model else model
-            if model_type.startswith(O1_MODEL_PREFIX):
+            if (model_type.startswith(O1_MODEL_PREFIX)) or ("deepseek-reasoner" in model):
                 user = f"{system}\n\n\n{user}"
                 system = ""
-                get_logger().info(f"Using O1 model, combining system and user prompts")
+                get_logger().info(f"Using model {model}, combining system and user prompts")
                 messages = [{"role": "user", "content": user}]
                 kwargs = {
                     "model": model,