diff --git a/README.md b/README.md
index 5c28173..72d85e1 100644
--- a/README.md
+++ b/README.md
@@ -117,9 +117,14 @@ Whether you're interested in AI, automation, or contributing to cutting-edge age
 
 
 ### Installation
+To install Agent S2.5 without cloning the repository, run
 ```bash
 pip install gui-agents
 ```
+If you would like to test Agent S2.5 while making changes, clone the repository and install using
+```
+pip install -e .
+```
 
 ### API Configuration
 
@@ -147,7 +152,7 @@ For optimal performance, we recommend [UI-TARS-1.5-7B](https://huggingface.co/By
 
 
 > ⚡️ **Recommended Setup:**  
-> For the best configuration, we recommend using **OpenAI o3-2025-04-16** as the main model, paired with **UI-TARS-1.5-7B** for grounding.  
+> For the best configuration, we recommend using **OpenAI gpt-5-2025-08-07** as the main model, paired with **UI-TARS-1.5-7B** for grounding.  
 
 
 ### CLI
@@ -157,7 +162,7 @@ Run Agent S2.5 with the required parameters:
 ```bash
 agent_s \
     --provider openai \
-    --model o3-2025-04-16 \
+    --model gpt-5-2025-08-07 \
     --ground_provider huggingface \
     --ground_url http://localhost:8080 \
     --ground_model ui-tars-1.5-7b \
@@ -167,13 +172,16 @@ agent_s \
 
 #### Required Parameters
 - **`--provider`**: Main generation model provider (e.g., openai, anthropic, etc.) - Default: "openai"
-- **`--model`**: Main generation model name (e.g., o3-2025-04-16) - Default: "o3-2025-04-16"
+- **`--model`**: Main generation model name (e.g., gpt-5-2025-08-07) - Default: "gpt-5-2025-08-07"
 - **`--ground_provider`**: The provider for the grounding model - **Required**
 - **`--ground_url`**: The URL of the grounding model - **Required**
 - **`--ground_model`**: The model name for the grounding model - **Required**
 - **`--grounding_width`**: Width of the output coordinate resolution from the grounding model - **Required**
 - **`--grounding_height`**: Height of the output coordinate resolution from the grounding model - **Required**
 
+#### Optional Parameters
+- **`--model_temperature`**: The temperature to fix all model calls to (necessary to set to 1.0 for models like o3 but can be left blank for other models)
+
 #### Grounding Model Dimensions
 The grounding width and height should match the output coordinate resolution of your grounding model:
 - **UI-TARS-1.5-7B**: Use `--grounding_width 1920 --grounding_height 1080`
@@ -208,8 +216,9 @@ Next, we define our engine parameters. `engine_params` is used for the main agen
 engine_params = {
   "engine_type": provider,
   "model": model,
-  "base_url": model_url,     # Optional
-  "api_key": model_api_key,  # Optional
+  "base_url": model_url,           # Optional
+  "api_key": model_api_key,        # Optional
+  "temperature": model_temperature # Optional
 }
 
 # Load the grounding engine from a custom endpoint
diff --git a/gui_agents/s2_5/cli_app.py b/gui_agents/s2_5/cli_app.py
index e135bb9..af33de1 100644
--- a/gui_agents/s2_5/cli_app.py
+++ b/gui_agents/s2_5/cli_app.py
@@ -230,8 +230,8 @@ def main():
     parser.add_argument(
         "--model",
         type=str,
-        default="o3-2025-04-16",
-        help="Specify the model to use (e.g., o3-2025-04-16)",
+        default="gpt-5-2025-08-07",
+        help="Specify the model to use (e.g., gpt-5-2025-08-07)",
     )
     parser.add_argument(
         "--model_url",
@@ -245,6 +245,12 @@ def main():
         default="",
         help="The API key of the main generation model.",
     )
+    parser.add_argument(
+        "--model_temperature",
+        type=float,
+        default=None,
+        help="Temperature to fix the generation model at (e.g. o3 can only be run with 1.0)"
+    )
 
     # Grounding model config: Self-hosted endpoint based (required)
     parser.add_argument(
@@ -312,6 +318,7 @@ def main():
         "model": args.model,
         "base_url": args.model_url,
         "api_key": args.model_api_key,
+        "temperature": getattr(args, 'model_temperature', None),
     }
 
     # Load the grounding engine from a custom endpoint
diff --git a/models.md b/models.md
index 932be6e..d7ebe05 100644
--- a/models.md
+++ b/models.md
@@ -46,7 +46,7 @@ from gui_agents.s2_5.agents.agent_s import AgentS2_5
 
 engine_params = {
     "engine_type": 'openai', # Allowed Values: 'openai', 'anthropic', 'gemini', 'azure_openai', 'vllm', 'open_router'
-    "model": 'o3-2025-04-16', # Allowed Values: Any Vision and Language Model from the supported APIs
+    "model": 'gpt-5-2025-08-07', # Allowed Values: Any Vision and Language Model from the supported APIs
 }
 agent = AgentS2_5(
     engine_params,
@@ -62,7 +62,7 @@ from gui_agents.s2_5.core.mllm import LMMAgent
 
 engine_params = {
     "engine_type": 'openai', # Allowed Values: 'openai', 'anthropic', 'gemini', 'azure_openai', 'vllm', 'open_router'
-    "model": 'o3-2025-04-16', # Allowed Values: Any Vision and Language Model from the supported APIs
+    "model": 'gpt-5-2025-08-07', # Allowed Values: Any Vision and Language Model from the supported APIs
     }
 agent = LMMAgent(
     engine_params=engine_params,