diff --git a/app/components/Chatbot/ChatEntry.tsx b/app/components/Chatbot/ChatEntry.tsx
index c28a2d9d..bebefc51 100644
--- a/app/components/Chatbot/ChatEntry.tsx
+++ b/app/components/Chatbot/ChatEntry.tsx
@@ -3,6 +3,7 @@ import {Link} from '@remix-run/react'
 import MarkdownIt from 'markdown-it'
 import QuestionMarkIcon from '~/components/icons-generated/QuestionMark'
 import BotIcon from '~/components/icons-generated/Bot'
+import LinkIcon from '~/components/icons-generated/Link'
 import PersonIcon from '~/components/icons-generated/Person'
 import StampyIcon from '~/components/icons-generated/Stampy'
 import Contents from '~/components/Article/Contents'
@@ -104,8 +105,9 @@ const Reference = ({id, title, authors, source, url, index}: Citation) => {
         <div>
           <Authors authors={authors} />
           <span>{'  ·  '}</span>
-          <Link className="source-link" to={url}>
-            {referenceSources[source as keyof typeof referenceSources] || new URL(url).host}
+          <Link className="source-link" to={url} target="_blank" rel="noopener noreferrer">
+            {referenceSources[source as keyof typeof referenceSources] || new URL(url).host}{' '}
+            <LinkIcon width="16" height="16" />
           </Link>
         </div>
       </div>
@@ -158,7 +160,12 @@ const ChatbotReply = ({phase, content, citationsMap}: AssistantEntry) => {
           }
         })}
       </div>
-      {citations?.slice(0, MAX_REFERENCES).map(Reference)}
+      {citations && citations.length > 0 && (
+        <>
+          <hr />
+          <div className="padding-top-32">{citations?.slice(0, MAX_REFERENCES).map(Reference)}</div>
+        </>
+      )}
       {phase === 'followups' ? <p>Checking for followups...</p> : undefined}
     </div>
   )
diff --git a/app/components/Chatbot/index.tsx b/app/components/Chatbot/index.tsx
index 68682070..9412a470 100644
--- a/app/components/Chatbot/index.tsx
+++ b/app/components/Chatbot/index.tsx
@@ -3,7 +3,7 @@ import {Link, useFetcher} from '@remix-run/react'
 import StampyIcon from '~/components/icons-generated/Stampy'
 import SendIcon from '~/components/icons-generated/PlaneSend'
 import Button from '~/components/Button'
-import {queryLLM, Entry, AssistantEntry, StampyEntry, Followup} from '~/hooks/useChat'
+import {queryLLM, Entry, AssistantEntry, StampyEntry, Followup, ChatSettings} from '~/hooks/useChat'
 import ChatEntry from './ChatEntry'
 import './widgit.css'
 import {questionUrl} from '~/routesMapper'
@@ -138,7 +138,12 @@ const SplashScreen = ({
   </>
 )
 
-export const Chatbot = ({question, questions}: {question?: string; questions?: string[]}) => {
+type ChatbotProps = {
+  question?: string
+  questions?: string[]
+  settings?: ChatSettings
+}
+export const Chatbot = ({question, questions, settings}: ChatbotProps) => {
   const [followups, setFollowups] = useState<Followup[]>()
 
   // FIXME: Generate session id
@@ -231,7 +236,8 @@ export const Chatbot = ({question, questions}: {question?: string; questions?: s
       [...history, message],
       updateReply,
       sessionId,
-      newController
+      newController,
+      settings
     )
     if (!newController.signal.aborted) {
       updateReply(result)
diff --git a/app/components/Chatbot/widgit.css b/app/components/Chatbot/widgit.css
index 1aaea416..a54b8512 100644
--- a/app/components/Chatbot/widgit.css
+++ b/app/components/Chatbot/widgit.css
@@ -20,3 +20,16 @@
     width: 100%;
   }
 }
+
+.settings-container {
+  position: absolute;
+  bottom: var(--spacing-16);
+  left: var(--spacing-16);
+}
+
+.settings {
+  padding: var(--spacing-32);
+  margin-bottom: var(--spacing-24);
+  flex-direction: column;
+  gap: var(--spacing-24);
+}
diff --git a/app/hooks/useChat.ts b/app/hooks/useChat.ts
index a8563ad6..d4d6c946 100644
--- a/app/hooks/useChat.ts
+++ b/app/hooks/useChat.ts
@@ -61,7 +61,18 @@ export type SearchResult = {
   result: Entry
 }
 
-export type Mode = 'rookie' | 'concise' | 'default' | 'discord'
+type Model =
+  | 'gpt-3.5-turbo'
+  | 'gpt-4'
+  | 'gpt-4-turbo-preview'
+  | 'claude-3-opus-20240229'
+  | 'claude-3-sonnet-20240229'
+  | 'claude-3-haiku-20240307'
+export type Mode = 'rookie' | 'concise' | 'default'
+export type ChatSettings = {
+  mode?: Mode
+  completions?: Model
+}
 
 const DATA_HEADER = 'data: '
 const EVENT_END_HEADER = 'event: close'
@@ -229,7 +240,8 @@ export const extractAnswer = async (
 const fetchLLM = async (
   sessionId: string | undefined,
   history: HistoryEntry[],
-  controller: AbortController
+  controller: AbortController,
+  settings?: ChatSettings
 ): Promise<Response | void> =>
   fetch(CHATBOT_URL, {
     signal: controller.signal,
@@ -240,18 +252,19 @@ const fetchLLM = async (
       'Content-Type': 'application/json',
       Accept: 'text/event-stream',
     },
-    body: JSON.stringify({sessionId, history, settings: {mode: 'default'}}),
+    body: JSON.stringify({sessionId, history, settings}),
   }).catch(ignoreAbort)
 
 export const queryLLM = async (
   history: HistoryEntry[],
   setCurrent: (e: AssistantEntry) => void,
   sessionId: string | undefined,
-  controller: AbortController
+  controller: AbortController,
+  settings?: ChatSettings
 ): Promise<SearchResult> => {
   setCurrent({...makeEntry(), phase: 'started'})
   // do SSE on a POST request.
-  const res = await fetchLLM(sessionId, history, controller)
+  const res = await fetchLLM(sessionId, history, controller, settings)
 
   if (!res) {
     return {result: {role: 'error', content: 'No response from server'}}
diff --git a/app/root.css b/app/root.css
index bce98dcc..0de35ba7 100644
--- a/app/root.css
+++ b/app/root.css
@@ -392,6 +392,10 @@ svg {
   cursor: pointer;
 }
 
+.full-height {
+  height: 100%;
+}
+
 /* for troubleshooting */
 
 .pink {
diff --git a/app/routes/chat.tsx b/app/routes/chat.tsx
index 1adef68e..265c39cc 100644
--- a/app/routes/chat.tsx
+++ b/app/routes/chat.tsx
@@ -1,16 +1,37 @@
+import {useState} from 'react'
 import {ShouldRevalidateFunction, useSearchParams} from '@remix-run/react'
+import SettingsIcon from '~/components/icons-generated/Settings'
 import Page from '~/components/Page'
 import Chatbot from '~/components/Chatbot'
+import {ChatSettings, Mode} from '~/hooks/useChat'
+import Button from '~/components/Button'
 
 export const shouldRevalidate: ShouldRevalidateFunction = () => false
 
 export default function App() {
   const [params] = useSearchParams()
+  const [showSettings, setShowSettings] = useState(false)
+  const [chatSettings, setChatSettings] = useState({mode: 'default'} as ChatSettings)
   const question = params.get('question') || undefined
 
+  const ModeButton = ({name, mode}: {name: string; mode: Mode}) => (
+    <Button
+      className={chatSettings.mode === mode ? 'primary-alt' : ''}
+      action={() => setChatSettings({...chatSettings, mode})}
+    >
+      {name}
+    </Button>
+  )
+
+  const stopBubbling = (e: any) => {
+    e.preventDefault()
+    e.stopPropagation()
+    e.nativeEvent.stopImmediatePropagation()
+  }
+
   return (
     <Page noFooter>
-      <div className="page-body">
+      <div className="page-body full-height" onClick={stopBubbling}>
         <Chatbot
           question={question}
           questions={[
@@ -18,7 +39,24 @@ export default function App() {
             'How would the AI even get out in the world?',
             'Do people seriously worry about existential risk from AI?',
           ]}
+          settings={chatSettings}
         />
+        <div className="settings-container" onClick={stopBubbling}>
+          {showSettings && (
+            <div className="settings bordered flex-container">
+              <div>Answer detail</div>
+              <ModeButton mode="default" name="Default" />
+              <ModeButton mode="rookie" name="Detailed" />
+              <ModeButton mode="concise" name="Concise" />
+            </div>
+          )}
+          <SettingsIcon
+            width="32"
+            height="32"
+            className="pointer"
+            onClick={() => setShowSettings((current) => !current)}
+          />
+        </div>
       </div>
     </Page>
   )