diff --git a/custom_components/ha_text_ai/config_flow.py b/custom_components/ha_text_ai/config_flow.py
new file mode 100644
index 0000000..daff541
--- /dev/null
+++ b/custom_components/ha_text_ai/config_flow.py
@@ -0,0 +1,123 @@
+"""Config flow for HA Text AI Integration."""
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+import voluptuous as vol
+import openai
+
+from homeassistant import config_entries
+from homeassistant.core import HomeAssistant, callback
+from homeassistant.data_entry_flow import FlowResult
+from homeassistant.exceptions import HomeAssistantError
+
+from .const import (
+    DOMAIN,
+    CONF_API_KEY,
+    CONF_API_BASE,
+    CONF_REQUEST_INTERVAL,
+    DEFAULT_API_BASE,
+    DEFAULT_REQUEST_INTERVAL,
+)
+
+_LOGGER = logging.getLogger(__name__)
+
+class TextAIConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
+    """Handle a config flow for HA Text AI Integration."""
+
+    VERSION = 1
+
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
+        """Handle the initial step."""
+        errors = {}
+
+        if user_input is not None:
+            try:
+                await self._test_api_key(user_input[CONF_API_KEY], user_input.get(CONF_API_BASE))
+                return self.async_create_entry(
+                    title="HA Text AI",
+                    data=user_input,
+                )
+            except ApiKeyError:
+                errors["base"] = "invalid_api_key"
+            except ApiConnectionError:
+                errors["base"] = "cannot_connect"
+            except Exception:  # pylint: disable=broad-except
+                _LOGGER.exception("Unexpected exception")
+                errors["base"] = "unknown"
+
+        return self.async_show_form(
+            step_id="user",
+            data_schema=vol.Schema(
+                {
+                    vol.Required(CONF_API_KEY): str,
+                    vol.Optional(CONF_API_BASE, default=DEFAULT_API_BASE): str,
+                    vol.Optional(CONF_REQUEST_INTERVAL, default=DEFAULT_REQUEST_INTERVAL): int,
+                }
+            ),
+            errors=errors,
+        )
+
+    @staticmethod
+    async def _test_api_key(api_key: str, api_base: str | None) -> None:
+        """Test if the API key is valid."""
+        try:
+            openai.api_key = api_key
+            if api_base:
+                openai.api_base = api_base
+            
+            models = await openai.Model.alist()
+            if not models:
+                raise ApiKeyError
+        except openai.error.AuthenticationError as err:
+            raise ApiKeyError from err
+        except openai.error.APIConnectionError as err:
+            raise ApiConnectionError from err
+
+    @staticmethod
+    @callback
+    def async_get_options_flow(
+        config_entry: config_entries.ConfigEntry,
+    ) -> TextAIOptionsFlow:
+        """Get the options flow for this handler."""
+        return TextAIOptionsFlow(config_entry)
+
+
+class TextAIOptionsFlow(config_entries.OptionsFlow):
+    """Handle options flow for HA Text AI Integration."""
+
+    def __init__(self, config_entry: config_entries.ConfigEntry) -> None:
+        """Initialize options flow."""
+        self.config_entry = config_entry
+
+    async def async_step_init(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
+        """Manage options."""
+        if user_input is not None:
+            return self.async_create_entry(title="", data=user_input)
+
+        return self.async_show_form(
+            step_id="init",
+            data_schema=vol.Schema(
+                {
+                    vol.Optional(
+                        CONF_REQUEST_INTERVAL,
+                        default=self.config_entry.options.get(
+                            CONF_REQUEST_INTERVAL, DEFAULT_REQUEST_INTERVAL
+                        ),
+                    ): int,
+                }
+            ),
+        )
+
+
+class ApiKeyError(HomeAssistantError):
+    """Error to indicate there is an invalid API key."""
+
+
+class ApiConnectionError(HomeAssistantError):
+    """Error to indicate there is a connection error."""