diff --git a/pr_agent/algo/__init__.py b/pr_agent/algo/__init__.py
index 0de83548..db2da0eb 100644
--- a/pr_agent/algo/__init__.py
+++ b/pr_agent/algo/__init__.py
@@ -28,6 +28,8 @@ MAX_TOKENS = {
     'gpt-4.1-mini-2025-04-14': 1047576,
     'gpt-4.1-nano': 1047576,
     'gpt-4.1-nano-2025-04-14': 1047576,
+    'gpt-5': 200000,
+    'gpt-5-2025-08-07': 200000,
     'o1-mini': 128000,  # 128K, but may be limited by config.max_model_tokens
     'o1-mini-2024-09-12': 128000,  # 128K, but may be limited by config.max_model_tokens
     'o1-preview': 128000,  # 128K, but may be limited by config.max_model_tokens
diff --git a/pr_agent/algo/ai_handlers/litellm_ai_handler.py b/pr_agent/algo/ai_handlers/litellm_ai_handler.py
index ed77daf6..84911937 100644
--- a/pr_agent/algo/ai_handlers/litellm_ai_handler.py
+++ b/pr_agent/algo/ai_handlers/litellm_ai_handler.py
@@ -288,6 +288,21 @@ class LiteLLMAIHandler(BaseAiHandler):
                 messages[1]["content"] = [{"type": "text", "text": messages[1]["content"]},
                                           {"type": "image_url", "image_url": {"url": img_path}}]
 
+            thinking_kwargs_gpt5 = None
+            if model.startswith('gpt-5'):
+                if model.endswith('_thinking'):
+                    thinking_kwargs_gpt5 = {
+                        "reasoning_effort": 'low',
+                        "allowed_openai_params": ["reasoning_effort"],
+                    }
+                else:
+                    thinking_kwargs_gpt5 = {
+                        "reasoning_effort": 'minimal',
+                        "allowed_openai_params": ["reasoning_effort"],
+                    }
+                model = model.replace('_thinking', '')  # remove _thinking suffix
+
+
             # Currently, some models do not support a separate system and user prompts
             if model in self.user_message_only_models or get_settings().config.custom_reasoning_model:
                 user = f"{system}\n\n\n{user}"
@@ -310,6 +325,11 @@ class LiteLLMAIHandler(BaseAiHandler):
                     "api_base": self.api_base,
                 }
 
+            if thinking_kwargs_gpt5:
+                kwargs.update(thinking_kwargs_gpt5)
+                if 'temperature' in kwargs:
+                    del kwargs['temperature']
+
             # Add temperature only if model supports it
             if model not in self.no_support_temperature_models and not get_settings().config.custom_reasoning_model:
                 # get_logger().info(f"Adding temperature with value {temperature} to model {model}.")
diff --git a/pr_agent/settings/configuration.toml b/pr_agent/settings/configuration.toml
index d1963f01..ab04f463 100644
--- a/pr_agent/settings/configuration.toml
+++ b/pr_agent/settings/configuration.toml
@@ -6,8 +6,8 @@
 
 [config]
 # models
-model="o4-mini"
-fallback_models=["gpt-4.1"]
+model="gpt-5-2025-08-07"
+fallback_models=["o4-mini"]
 #model_reasoning="o4-mini" # dedicated reasoning model for self-reflection
 #model_weak="gpt-4o" # optional, a weaker model to use for some easier tasks
 # CLI
diff --git a/requirements.txt b/requirements.txt
index 18f6e383..6e3f6f60 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ google-cloud-aiplatform==1.38.0
 google-generativeai==0.8.3
 google-cloud-storage==2.10.0
 Jinja2==3.1.2
-litellm==1.70.4
+litellm==1.75.2
 loguru==0.7.2
 msrest==0.7.1
 openai>=1.55.3