diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index fab5c71e..c46492c5 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -36,6 +36,7 @@ en:
     composer_ai_helper_enabled: "Enable the Composer's AI helper."
     ai_helper_allowed_groups: "Users on these groups will see the AI helper button in the composer."
     ai_helper_allowed_in_pm: "Enable the composer's AI helper in PMs."
+    ai_helper_model: "Model to use for the AI helper."
 
     ai_embeddings_enabled: "Enable the embeddings module."
     ai_embeddings_discourse_service_api_endpoint: "URL where the API is running for the embeddings module"
diff --git a/config/settings.yml b/config/settings.yml
index 4d9a10ea..4d7c2136 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -101,6 +101,12 @@ plugins:
   ai_helper_allowed_in_pm:
     default: false
     client: true
+  ai_helper_model:
+    default: gpt-3.5-turbo
+    type: enum
+    choices:
+      - gpt-3.5-turbo
+      - gpt-4
 
   ai_embeddings_enabled: false
   ai_embeddings_discourse_service_api_endpoint: ""
diff --git a/lib/shared/inference/openai_completions.rb b/lib/shared/inference/openai_completions.rb
index 22439b6a..61f6b3c0 100644
--- a/lib/shared/inference/openai_completions.rb
+++ b/lib/shared/inference/openai_completions.rb
@@ -5,12 +5,14 @@ module ::DiscourseAi
     class OpenAiCompletions
       CompletionFailed = Class.new(StandardError)
 
-      def self.perform!(messages, model = "gpt-3.5-turbo")
+      def self.perform!(messages)
         headers = {
           "Authorization" => "Bearer #{SiteSetting.ai_openai_api_key}",
           "Content-Type" => "application/json",
         }
 
+        model = SiteSetting.ai_helper_model
+
         connection_opts = { request: { write_timeout: 60, read_timeout: 60, open_timeout: 60 } }
 
         response =