diff --git a/extensions/openai/typing.py b/extensions/openai/typing.py
index 6643ed16..6bd3749f 100644
--- a/extensions/openai/typing.py
+++ b/extensions/openai/typing.py
@@ -43,6 +43,7 @@ class GenerationOptions(BaseModel):
     ban_eos_token: bool = False
     add_bos_token: bool = True
     enable_thinking: bool = True
+    reasoning_effort: str = "medium"
     skip_special_tokens: bool = True
     static_cache: bool = False
     truncation_length: int = 0
diff --git a/modules/chat.py b/modules/chat.py
index 043908c9..dd923d67 100644
--- a/modules/chat.py
+++ b/modules/chat.py
@@ -306,7 +306,8 @@ def generate_chat_prompt(user_input, state, **kwargs):
         builtin_tools=None,
         tools=state['tools'] if 'tools' in state else None,
         tools_in_user_message=False,
-        add_generation_prompt=False
+        add_generation_prompt=False,
+        reasoning_effort=state.get('reasoning_effort', 'medium')
     )
 
     chat_renderer = partial(
diff --git a/modules/loaders.py b/modules/loaders.py
index f515aeca..7546bc5b 100644
--- a/modules/loaders.py
+++ b/modules/loaders.py
@@ -137,6 +137,7 @@ def transformers_samplers():
         'ban_eos_token',
         'add_bos_token',
         'enable_thinking',
+        'reasoning_effort',
         'skip_special_tokens',
         'static_cache',
         'seed',
@@ -189,6 +190,7 @@ loaders_samplers = {
         'ban_eos_token',
         'add_bos_token',
         'enable_thinking',
+        'reasoning_effort',
         'skip_special_tokens',
         'seed',
         'sampler_priority',
@@ -236,6 +238,7 @@ loaders_samplers = {
         'ban_eos_token',
         'add_bos_token',
         'enable_thinking',
+        'reasoning_effort',
         'skip_special_tokens',
         'seed',
         'sampler_priority',
@@ -275,6 +278,7 @@ loaders_samplers = {
         'ban_eos_token',
         'add_bos_token',
         'enable_thinking',
+        'reasoning_effort',
         'skip_special_tokens',
         'seed',
         'custom_token_bans',
@@ -308,6 +312,7 @@ loaders_samplers = {
         'ban_eos_token',
         'add_bos_token',
         'enable_thinking',
+        'reasoning_effort',
         'seed',
         'sampler_priority',
         'dry_sequence_breakers',
diff --git a/modules/shared.py b/modules/shared.py
index 5e3e11c0..ab5198d1 100644
--- a/modules/shared.py
+++ b/modules/shared.py
@@ -211,6 +211,7 @@ settings = {
     'ban_eos_token': False,
     'add_bos_token': True,
     'enable_thinking': True,
+    'reasoning_effort': 'medium',
     'skip_special_tokens': True,
     'stream': True,
     'static_cache': False,
diff --git a/modules/ui.py b/modules/ui.py
index 98acc038..e7805046 100644
--- a/modules/ui.py
+++ b/modules/ui.py
@@ -215,6 +215,7 @@ def list_interface_input_elements():
         'ban_eos_token',
         'add_bos_token',
         'enable_thinking',
+        'reasoning_effort',
         'skip_special_tokens',
         'stream',
         'static_cache',
@@ -482,6 +483,7 @@ def setup_auto_save():
         'ban_eos_token',
         'add_bos_token',
         'enable_thinking',
+        'reasoning_effort',
         'skip_special_tokens',
         'stream',
         'static_cache',
diff --git a/modules/ui_chat.py b/modules/ui_chat.py
index 4dade176..1d85a398 100644
--- a/modules/ui_chat.py
+++ b/modules/ui_chat.py
@@ -78,7 +78,8 @@ def create_ui():
                 with gr.Row():
                     shared.gradio['start_with'] = gr.Textbox(label='Start reply with', placeholder='Sure thing!', value=shared.settings['start_with'], elem_classes=['add_scrollbar'])
 
-                shared.gradio['enable_thinking'] = gr.Checkbox(value=shared.settings['enable_thinking'], label='Enable thinking', info='Used by Qwen3 to toggle <think> mode.')
+                shared.gradio['reasoning_effort'] = gr.Dropdown(value=shared.settings['reasoning_effort'], choices=['low', 'medium', 'high'], label='Reasoning effort', info='Used by GPT-OSS.')
+                shared.gradio['enable_thinking'] = gr.Checkbox(value=shared.settings['enable_thinking'], label='Enable thinking', info='Used by pre-2507 Qwen3.')
                 shared.gradio['enable_web_search'] = gr.Checkbox(value=shared.settings.get('enable_web_search', False), label='Activate web search', elem_id='web-search')
                 with gr.Row(visible=shared.settings.get('enable_web_search', False)) as shared.gradio['web_search_row']:
                     shared.gradio['web_search_pages'] = gr.Number(value=shared.settings.get('web_search_pages', 3), precision=0, label='Number of pages to download', minimum=1, maximum=10)