diff --git a/src/lib/ChatRequestPetals.svelte b/src/lib/ChatRequestPetals.svelte
index 96e3667..8df2175 100644
--- a/src/lib/ChatRequestPetals.svelte
+++ b/src/lib/ChatRequestPetals.svelte
@@ -1,7 +1,7 @@
 <script context="module" lang="ts">
     import ChatCompletionResponse from './ChatCompletionResponse.svelte'
     import ChatRequest from './ChatRequest.svelte'
-    import { getEndpoint, getModelDetail, getRoleTag, getStopSequence } from './Models.svelte'
+    import { getDeliminator, getEndpoint, getLeadPrompt, getModelDetail, getRoleEnd, getRoleTag, getStartSequence, getStopSequence } from './Models.svelte'
     import type { ChatCompletionOpts, Message, Request } from './Types.svelte'
     import { getModelMaxTokens } from './Stats.svelte'
     import { updateMessages } from './Storage.svelte'
@@ -27,13 +27,18 @@ export const runPetalsCompletionRequest = async (
       signal.addEventListener('abort', abortListener)
       const stopSequences = (modelDetail.stop || ['###', '</s>']).slice()
       const stopSequence = getStopSequence(chat)
+      const deliminator = getDeliminator(chat)
+      if (deliminator) stopSequences.unshift(deliminator)
       let stopSequenceC = stopSequence
       if (stopSequence !== '###') {
         stopSequences.push(stopSequence)
         stopSequenceC = '</s>'
       }
+      const haveSeq = {}
       const stopSequencesC = stopSequences.filter((ss) => {
-        return ss !== '###' && ss !== stopSequenceC
+        const have = haveSeq[ss]
+        haveSeq[ss] = true
+        return !have && ss !== '###' && ss !== stopSequenceC
       })
       const maxTokens = getModelMaxTokens(model)
       let maxLen = Math.min(opts.maxTokens || chatRequest.chat.max_tokens || maxTokens, maxTokens)
@@ -54,6 +59,7 @@ export const runPetalsCompletionRequest = async (
         }
         chatRequest.updating = false
         chatRequest.updatingMessage = ''
+        ws.close()
       })
       ws.onopen = () => {
         ws.send(JSON.stringify({
@@ -69,7 +75,21 @@ export const runPetalsCompletionRequest = async (
             console.error(err)
             throw err
           }
-          const rMessages = request.messages || [] as Message[]
+          // Enforce strict order of messages
+          const fMessages = (request.messages || [] as Message[])
+          const rMessages = fMessages.reduce((a, m, i) => {
+            a.push(m)
+            const nm = fMessages[i + 1]
+            if (m.role === 'system' && (!nm || nm.role !== 'user')) {
+              const nc = {
+                role: 'user',
+                content: ''
+              } as Message
+              a.push(nc)
+            }
+            return a
+          },
+          [] as Message[])
           // make sure top_p and temperature are set the way we need
           let temperature = request.temperature
           if (temperature === undefined || isNaN(temperature as any)) temperature = 1
@@ -78,18 +98,47 @@ export const runPetalsCompletionRequest = async (
           if (topP === undefined || isNaN(topP as any)) topP = 1
           if (!topP || topP <= 0) topP = 0.01
           // build the message array
-          const inputArray = (rMessages).reduce((a, m) => {
-            const c = getRoleTag(m.role, model, chatRequest.chat) + m.content
-            a.push(c.trim())
-            return a
-          }, [] as string[])
-          const lastMessage = rMessages[rMessages.length - 1]
-          if (lastMessage && lastMessage.role !== 'assistant') {
-            inputArray.push(getRoleTag('assistant', model, chatRequest.chat))
+          const buildMessage = (m: Message): string => {
+            return getRoleTag(m.role, model, chat) + m.content + getRoleEnd(m.role, model, chat)
           }
+          const inputArray = rMessages.reduce((a, m, i) => {
+            let c = buildMessage(m)
+            let replace = false
+            const lm = a[a.length - 1]
+            // Merge content if needed
+            if (lm) {
+              if (lm.role === 'system' && m.role === 'user' && c.includes('[[SYSTEM_PROMPT]]')) {
+                c = c.replaceAll('[[SYSTEM_PROMPT]]', lm.content)
+                replace = true
+              } else {
+                c = c.replaceAll('[[SYSTEM_PROMPT]]', '')
+              }
+              if (lm.role === 'user' && m.role === 'assistant' && c.includes('[[USER_PROMPT]]')) {
+                c = c.replaceAll('[[USER_PROMPT]]', lm.content)
+                replace = true
+              } else {
+                c = c.replaceAll('[[USER_PROMPT]]', '')
+              }
+            }
+            // Clean up merge fields on last
+            if (!rMessages[i + 1]) {
+              c = c.replaceAll('[[USER_PROMPT]]', '').replaceAll('[[SYSTEM_PROMPT]]', '')
+            }
+            const result = {
+              role: m.role,
+              content: c.trim()
+            } as Message
+            if (replace) {
+              a[a.length - 1] = result
+            } else {
+              a.push(result)
+            }
+            return a
+          }, [] as Message[])
+          const leadPrompt = ((inputArray[inputArray.length - 1] || {}) as Message).role !== 'assistant' ? getLeadPrompt(chat) : ''
           const petalsRequest = {
             type: 'generate',
-            inputs: inputArray.join(stopSequence),
+            inputs: getStartSequence(chat) + inputArray.map(m => m.content).join(deliminator) + leadPrompt,
             max_new_tokens: 1, // wait for up to 1 tokens before displaying
             stop_sequence: stopSequenceC,
             do_sample: 1, // enable top p and the like
diff --git a/src/lib/Models.svelte b/src/lib/Models.svelte
index a1c25a8..5e75f9c 100644
--- a/src/lib/Models.svelte
+++ b/src/lib/Models.svelte
@@ -46,6 +46,7 @@ const modelDetails : Record<string, ModelDetail> = {
         type: 'Petals',
         label: 'Petals - Llama-65b',
         stop: ['###', '</s>'],
+        deliminator: '###',
         userStart: '<|user|>',
         assistantStart: '<|[[CHARACTER_NAME]]|>',
         systemStart: '',
@@ -57,6 +58,7 @@ const modelDetails : Record<string, ModelDetail> = {
         type: 'Petals',
         label: 'Petals - Guanaco-65b',
         stop: ['###', '</s>'],
+        deliminator: '###',
         userStart: '<|user|>',
         assistantStart: '<|[[CHARACTER_NAME]]|>',
         systemStart: '',
@@ -67,10 +69,15 @@ const modelDetails : Record<string, ModelDetail> = {
       'meta-llama/Llama-2-70b-chat-hf': {
         type: 'Petals',
         label: 'Petals - Llama-2-70b-chat',
-        stop: ['###', '</s>'],
-        userStart: '<|user|>',
-        assistantStart: '<|[[CHARACTER_NAME]]|>',
-        systemStart: '',
+        start: '<s>',
+        stop: ['</s>'],
+        deliminator: ' </s><s>',
+        userStart: '[INST][[SYSTEM_PROMPT]]',
+        userEnd: ' [/INST]',
+        assistantStart: '[[SYSTEM_PROMPT]][[USER_PROMPT]]',
+        assistantEnd: '',
+        systemStart: '<<SYS>>\n',
+        systemEnd: '\n<</SYS>>\n\n',
         prompt: 0.000000, // $0.000 per 1000 tokens prompt
         completion: 0.000000, // $0.000 per 1000 tokens completion
         max: 4096 // 4k max token buffer
@@ -177,10 +184,29 @@ export const getEndpoint = (model: Model): string => {
   }
 }
 
+
+export const getStartSequence = (chat: Chat): string => {
+  return mergeProfileFields(
+        chat.settings,
+        chat.settings.startSequence || valueOf(chat.id, getChatSettingObjectByKey('startSequence').placeholder)
+      )
+}
+
 export const getStopSequence = (chat: Chat): string => {
   return chat.settings.stopSequence || valueOf(chat.id, getChatSettingObjectByKey('stopSequence').placeholder)
 }
 
+export const getDeliminator = (chat: Chat): string => {
+  return chat.settings.deliminator || valueOf(chat.id, getChatSettingObjectByKey('deliminator').placeholder)
+}
+
+export const getLeadPrompt = (chat: Chat): string => {
+  return mergeProfileFields(
+        chat.settings,
+        chat.settings.leadPrompt || valueOf(chat.id, getChatSettingObjectByKey('leadPrompt').placeholder)
+      )
+}
+
 export const getUserStart = (chat: Chat): string => {
   return mergeProfileFields(
         chat.settings,
@@ -188,6 +214,13 @@ export const getUserStart = (chat: Chat): string => {
       )
 }
 
+export const getUserEnd = (chat: Chat): string => {
+  return mergeProfileFields(
+        chat.settings,
+        chat.settings.userMessageEnd || valueOf(chat.id, getChatSettingObjectByKey('userMessageEnd').placeholder)
+      )
+}
+
 export const getAssistantStart = (chat: Chat): string => {
   return mergeProfileFields(
         chat.settings,
@@ -195,6 +228,13 @@ export const getAssistantStart = (chat: Chat): string => {
       )
 }
 
+export const getAssistantEnd = (chat: Chat): string => {
+  return mergeProfileFields(
+        chat.settings,
+        chat.settings.assistantMessageEnd || valueOf(chat.id, getChatSettingObjectByKey('assistantMessageEnd').placeholder)
+      )
+}
+
 export const getSystemStart = (chat: Chat): string => {
   return mergeProfileFields(
         chat.settings,
@@ -202,6 +242,13 @@ export const getSystemStart = (chat: Chat): string => {
       )
 }
 
+export const getSystemEnd = (chat: Chat): string => {
+  return mergeProfileFields(
+        chat.settings,
+        chat.settings.systemMessageEnd || valueOf(chat.id, getChatSettingObjectByKey('systemMessageEnd').placeholder)
+      )
+}
+
 export const getRoleTag = (role: string, model: Model, chat: Chat): string => {
   const modelDetails = getModelDetail(model)
   switch (modelDetails.type) {
@@ -217,6 +264,21 @@ export const getRoleTag = (role: string, model: Model, chat: Chat): string => {
   }
 }
 
+export const getRoleEnd = (role: string, model: Model, chat: Chat): string => {
+  const modelDetails = getModelDetail(model)
+  switch (modelDetails.type) {
+        case 'Petals':
+          if (role === 'assistant') return getAssistantEnd(chat)
+          if (role === 'user') return getUserEnd(chat)
+          return getSystemEnd(chat)
+        case 'OpenAIDall-e':
+          return ''
+        case 'OpenAIChat':
+        default:
+          return ''
+  }
+}
+
 export const getTokens = (model: Model, value: string): number[] => {
   const modelDetails = getModelDetail(model)
   switch (modelDetails.type) {
diff --git a/src/lib/Settings.svelte b/src/lib/Settings.svelte
index 41613cc..1a6e743 100644
--- a/src/lib/Settings.svelte
+++ b/src/lib/Settings.svelte
@@ -109,11 +109,17 @@ const defaults:ChatSettings = {
   hppContinuePrompt: '',
   hppWithSummaryPrompt: false,
   imageGenerationSize: '',
+  startSequence: '',
   stopSequence: '',
   aggressiveStop: false,
+  deliminator: '',
   userMessageStart: '',
+  userMessageEnd: '',
   assistantMessageStart: '',
+  assistantMessageEnd: '',
   systemMessageStart: '',
+  systemMessageEnd: '',
+  leadPrompt: '',
   // useResponseAlteration: false,
   // responseAlterations: [],
   isDirty: false
@@ -514,10 +520,21 @@ const chatSettingsList: ChatSetting[] = [
         type: 'number',
         hide: isNotOpenAI
       },
+      {
+        key: 'startSequence',
+        name: 'Start Sequence',
+        title: 'Characters used to start the message chain.',
+        type: 'textarea',
+        placeholder: (chatId) => {
+          const val = getModelDetail(getChatSettings(chatId).model).start
+          return val || ''
+        },
+        hide: isNotPetals
+      },
       {
         key: 'stopSequence',
         name: 'Stop Sequence',
-        title: 'Characters used to separate messages in the message chain.',
+        title: 'Characters used to signal end of message chain.',
         type: 'text',
         placeholder: (chatId) => {
           const val = getModelDetail(getChatSettings(chatId).model).stop
@@ -532,39 +549,94 @@ const chatSettingsList: ChatSetting[] = [
         type: 'boolean',
         hide: isNotPetals
       },
+      {
+        key: 'deliminator',
+        name: 'Deliminator Sequence',
+        title: 'Characters used to separate messages in the message chain.',
+        type: 'textarea',
+        placeholder: (chatId) => {
+          const val = getModelDetail(getChatSettings(chatId).model).deliminator
+          return val || ''
+        },
+        hide: isNotPetals
+      },
       {
         key: 'userMessageStart',
         name: 'User Message Start Sequence',
-        title: 'Sequence to denote user messages in the message chain.',
-        type: 'text',
+        title: 'Sequence to denote start of user messages in the message chain.',
+        type: 'textarea',
         placeholder: (chatId) => {
           const val = getModelDetail(getChatSettings(chatId).model).userStart
           return val || ''
         },
         hide: isNotPetals
       },
+      {
+        key: 'userMessageEnd',
+        name: 'User Message End Sequence',
+        title: 'Sequence to denote end of user messages in the message chain.',
+        type: 'textarea',
+        placeholder: (chatId) => {
+          const val = getModelDetail(getChatSettings(chatId).model).userEnd
+          return val || ''
+        },
+        hide: isNotPetals
+      },
       {
         key: 'assistantMessageStart',
         name: 'Assistant Message Start Sequence',
         title: 'Sequence to denote assistant messages in the message chain.',
-        type: 'text',
+        type: 'textarea',
         placeholder: (chatId) => {
           const val = getModelDetail(getChatSettings(chatId).model).assistantStart
           return val || ''
         },
         hide: isNotPetals
       },
+      {
+        key: 'assistantMessageEnd',
+        name: 'Assistant Message End Sequence',
+        title: 'Sequence to denote end of assistant messages in the message chain.',
+        type: 'textarea',
+        placeholder: (chatId) => {
+          const val = getModelDetail(getChatSettings(chatId).model).assistantEnd
+          return val || ''
+        },
+        hide: isNotPetals
+      },
+      {
+        key: 'leadPrompt',
+        name: 'Completion Lead Sequence ',
+        title: 'Sequence to hint the LLM should answer as assistant.',
+        type: 'textarea',
+        placeholder: (chatId) => {
+          const val = getModelDetail(getChatSettings(chatId).model).leadPrompt
+          return val || ''
+        },
+        hide: isNotPetals
+      },
       {
         key: 'systemMessageStart',
         name: 'System Message Start Sequence',
         title: 'Sequence to denote system messages in the message chain.',
-        type: 'text',
+        type: 'textarea',
         placeholder: (chatId) => {
           const val = getModelDetail(getChatSettings(chatId).model).systemStart
           return val || ''
         },
         hide: isNotPetals
       },
+      {
+        key: 'systemMessageEnd',
+        name: 'System Message End Sequence',
+        title: 'Sequence to denote end of system messages in the message chain.',
+        type: 'textarea',
+        placeholder: (chatId) => {
+          const val = getModelDetail(getChatSettings(chatId).model).systemEnd
+          return val || ''
+        },
+        hide: isNotPetals
+      },
       {
         // logit bias editor not implemented yet
         key: 'logit_bias',
diff --git a/src/lib/Types.svelte b/src/lib/Types.svelte
index ae45919..592a626 100644
--- a/src/lib/Types.svelte
+++ b/src/lib/Types.svelte
@@ -12,10 +12,16 @@ export type RequestType = 'OpenAIChat' | 'OpenAIDall-e' | 'Petals'
 export type ModelDetail = {
     type: RequestType;
     label?: string;
+    start?: string;
     stop?: string[];
+    deliminator?: string;
     userStart?: string,
+    userEnd?: string,
     assistantStart?: string,
+    assistantEnd?: string,
     systemStart?: string,
+    systemEnd?: string,
+    leadPrompt?: string,
     prompt: number;
     completion: number;
     max: number;
@@ -113,11 +119,17 @@ export type ChatSettings = {
     trainingPrompts?: Message[];
     useResponseAlteration?: boolean;
     responseAlterations?: ResponseAlteration[];
+    startSequence: string;
     stopSequence: string;
     aggressiveStop: boolean;
+    deliminator: string;
     userMessageStart: string;
+    userMessageEnd: string;
     assistantMessageStart: string;
+    assistantMessageEnd: string;
+    leadPrompt: string;
     systemMessageStart: string;
+    systemMessageEnd: string;
     isDirty?: boolean;
   } & Request;