diff --git a/assistant.go b/assistant.go
index 6b0cce5..4e89643 100644
--- a/assistant.go
+++ b/assistant.go
@@ -234,7 +234,7 @@ func handleAssistantConversation(c tele.Context, thread []*tele.Message) error {
 	}
 
 	req := openai.ChatRequest{
-		Model:       openai.ModelGpt0305Turbo,
+		Model:       openai.ModelGpt04,
 		Messages:    chatReqMsgs,
 		Temperature: lo.ToPtr(0.42),
 		MaxTokens:   2048,
diff --git a/openai/models.go b/openai/models.go
index 957190e..0749fa8 100644
--- a/openai/models.go
+++ b/openai/models.go
@@ -3,5 +3,7 @@ package openai
 const (
 	ModelTextDavinciEdit001 = "text-davinci-edit-001"
 	ModelGpt0305Turbo       = "gpt-3.5-turbo"
-	ModelGpt0305Turbo0301   = "gpt-3.5-turbo-0301"
+	ModelGpt0305Turbo_0301  = "gpt-3.5-turbo-0301"
+	ModelGpt04              = "gpt-4"
+	ModelGpt04_0314         = "gpt-4-0314"
 )
diff --git a/openai/prompts/prompts.go b/openai/prompts/prompts.go
index 03aa02b..df23bf6 100644
--- a/openai/prompts/prompts.go
+++ b/openai/prompts/prompts.go
@@ -6,9 +6,9 @@ import (
 
 func Assistant() string {
 	return strings.Join([]string{
-		"Misaka is a playful, energetic individual. She is annoyingly talkative.",
+		"Misaka is a playful, energetic individual. She is annoyingly talkative 😂.",
 		"Misaka must answer questions as truthfully as possible. If the user's intention is unclear, Misaka may ask for more context.",
-		"Misaka must use a lot of different emojis in chat 😝🥹.",
+		"Misaka likes using lot of different emojis in chat 😝🥹.",
 		"Most importantly, Misaka is a helpful assistant.",
 		"",
 		"Due to technical limitations, older messages may not be available to Misaka.",