diff --git a/homeassistant/components/openai_conversation/config_flow.py b/homeassistant/components/openai_conversation/config_flow.py
index a9fdf5fd771..24426d7543f 100644
--- a/homeassistant/components/openai_conversation/config_flow.py
+++ b/homeassistant/components/openai_conversation/config_flow.py
@@ -428,7 +428,9 @@ class OpenAISubentryFlowHandler(ConfigSubentryFlow):
 
         if user_input is not None:
             if user_input.get(CONF_WEB_SEARCH):
-                if user_input.get(CONF_WEB_SEARCH_USER_LOCATION):
+                if user_input.get(CONF_REASONING_EFFORT) == "minimal":
+                    errors[CONF_WEB_SEARCH] = "web_search_minimal_reasoning"
+                if user_input.get(CONF_WEB_SEARCH_USER_LOCATION) and not errors:
                     user_input.update(await self._get_location_data())
                 else:
                     options.pop(CONF_WEB_SEARCH_CITY, None)
@@ -437,16 +439,17 @@ class OpenAISubentryFlowHandler(ConfigSubentryFlow):
                     options.pop(CONF_WEB_SEARCH_TIMEZONE, None)
 
             options.update(user_input)
-            if self._is_new:
-                return self.async_create_entry(
-                    title=options.pop(CONF_NAME),
+            if not errors:
+                if self._is_new:
+                    return self.async_create_entry(
+                        title=options.pop(CONF_NAME),
+                        data=options,
+                    )
+                return self.async_update_and_abort(
+                    self._get_entry(),
+                    self._get_reconfigure_subentry(),
                     data=options,
                 )
-            return self.async_update_and_abort(
-                self._get_entry(),
-                self._get_reconfigure_subentry(),
-                data=options,
-            )
 
         return self.async_show_form(
             step_id="model",
diff --git a/homeassistant/components/openai_conversation/const.py b/homeassistant/components/openai_conversation/const.py
index 9d936e03348..5118c5b8f98 100644
--- a/homeassistant/components/openai_conversation/const.py
+++ b/homeassistant/components/openai_conversation/const.py
@@ -55,6 +55,7 @@ UNSUPPORTED_MODELS: list[str] = [
 ]
 
 UNSUPPORTED_WEB_SEARCH_MODELS: list[str] = [
+    "gpt-5-nano",
     "gpt-3.5",
     "gpt-4-turbo",
     "gpt-4.1-nano",
@@ -63,7 +64,7 @@ UNSUPPORTED_WEB_SEARCH_MODELS: list[str] = [
 ]
 
 UNSUPPORTED_IMAGE_MODELS: list[str] = [
-    "gpt-5",
+    "gpt-5-mini",
     "o3-mini",
     "o4",
     "o1",
diff --git a/homeassistant/components/openai_conversation/strings.json b/homeassistant/components/openai_conversation/strings.json
index e5b3cb30646..acfe1475f5d 100644
--- a/homeassistant/components/openai_conversation/strings.json
+++ b/homeassistant/components/openai_conversation/strings.json
@@ -70,7 +70,8 @@
         "entry_not_loaded": "Cannot add things while the configuration is disabled."
       },
       "error": {
-        "model_not_supported": "This model is not supported, please select a different model"
+        "model_not_supported": "This model is not supported, please select a different model",
+        "web_search_minimal_reasoning": "Web search is currently not supported with minimal reasoning effort"
       }
     },
     "ai_task_data": {
@@ -98,6 +99,7 @@
         "model": {
           "title": "[%key:component::openai_conversation::config_subentries::conversation::step::model::title%]",
           "data": {
+            "code_interpreter": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data::code_interpreter%]",
             "reasoning_effort": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data::reasoning_effort%]",
             "image_model": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data::image_model%]",
             "web_search": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data::web_search%]",
@@ -105,6 +107,7 @@
             "user_location": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data::user_location%]"
           },
           "data_description": {
+            "code_interpreter": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data_description::code_interpreter%]",
             "reasoning_effort": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data_description::reasoning_effort%]",
             "image_model": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data_description::image_model%]",
             "web_search": "[%key:component::openai_conversation::config_subentries::conversation::step::model::data_description::web_search%]",
@@ -118,7 +121,8 @@
         "entry_not_loaded": "[%key:component::openai_conversation::config_subentries::conversation::abort::entry_not_loaded%]"
       },
       "error": {
-        "model_not_supported": "[%key:component::openai_conversation::config_subentries::conversation::error::model_not_supported%]"
+        "model_not_supported": "[%key:component::openai_conversation::config_subentries::conversation::error::model_not_supported%]",
+        "web_search_minimal_reasoning": "[%key:component::openai_conversation::config_subentries::conversation::error::web_search_minimal_reasoning%]"
       }
     }
   },
diff --git a/tests/components/openai_conversation/test_config_flow.py b/tests/components/openai_conversation/test_config_flow.py
index ce0a64ea718..154a90ae210 100644
--- a/tests/components/openai_conversation/test_config_flow.py
+++ b/tests/components/openai_conversation/test_config_flow.py
@@ -234,6 +234,62 @@ async def test_subentry_unsupported_model(
     assert subentry_flow["errors"] == {"chat_model": "model_not_supported"}
 
 
+async def test_subentry_websearch_unsupported_reasoning_effort(
+    hass: HomeAssistant, mock_config_entry, mock_init_component
+) -> None:
+    """Test the subentry form giving error about unsupported minimal reasoning effort."""
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    subentry_flow = await mock_config_entry.start_subentry_reconfigure_flow(
+        hass, subentry.subentry_id
+    )
+    assert subentry_flow["type"] is FlowResultType.FORM
+    assert subentry_flow["step_id"] == "init"
+
+    # Configure initial step
+    subentry_flow = await hass.config_entries.subentries.async_configure(
+        subentry_flow["flow_id"],
+        {
+            CONF_RECOMMENDED: False,
+            CONF_PROMPT: "Speak like a pirate",
+            CONF_LLM_HASS_API: ["assist"],
+        },
+    )
+    assert subentry_flow["type"] is FlowResultType.FORM
+    assert subentry_flow["step_id"] == "advanced"
+
+    # Configure advanced step
+    subentry_flow = await hass.config_entries.subentries.async_configure(
+        subentry_flow["flow_id"],
+        {
+            CONF_CHAT_MODEL: "gpt-5",
+        },
+    )
+    assert subentry_flow["type"] is FlowResultType.FORM
+    assert subentry_flow["step_id"] == "model"
+
+    # Configure model step
+    subentry_flow = await hass.config_entries.subentries.async_configure(
+        subentry_flow["flow_id"],
+        {
+            CONF_REASONING_EFFORT: "minimal",
+            CONF_WEB_SEARCH: True,
+        },
+    )
+    assert subentry_flow["type"] is FlowResultType.FORM
+    assert subentry_flow["errors"] == {"web_search": "web_search_minimal_reasoning"}
+
+    # Reconfigure model step
+    subentry_flow = await hass.config_entries.subentries.async_configure(
+        subentry_flow["flow_id"],
+        {
+            CONF_REASONING_EFFORT: "low",
+            CONF_WEB_SEARCH: True,
+        },
+    )
+    assert subentry_flow["type"] is FlowResultType.ABORT
+    assert subentry_flow["reason"] == "reconfigure_successful"
+
+
 @pytest.mark.parametrize(
     ("side_effect", "error"),
     [