diff --git a/anthropic_models.go b/anthropic_models.go
index b67099e..5a25f2f 100644
--- a/anthropic_models.go
+++ b/anthropic_models.go
@@ -5,6 +5,8 @@ package anthrogo
 type AnthropicModel string
 
 const (
+	ModelClaude3Dot5Sonnet AnthropicModel = "claude-3-5-sonnet-20240620"
+
 	ModelClaude3Opus   AnthropicModel = "claude-3-opus-20240229"
 	ModelClaude3Sonnet AnthropicModel = "claude-3-sonnet-20240229"
 	ModelClaude3Haiku  AnthropicModel = "claude-3-haiku-20240307"
diff --git a/examples/messages/message_basic.go b/examples/messages/message_basic.go
index 9e0b054..c05b131 100644
--- a/examples/messages/message_basic.go
+++ b/examples/messages/message_basic.go
@@ -27,7 +27,7 @@ func main() {
 	userPrompt = strings.TrimSuffix(userPrompt, "\n")
 
 	resp, err := c.MessageRequest(context.Background(), anthrogo.MessagePayload{
-		Model: anthrogo.ModelClaude3Opus,
+		Model: anthrogo.ModelClaude3Dot5Sonnet,
 		Messages: []anthrogo.Message{{
 			Role: anthrogo.RoleTypeUser,
 			Content: []anthrogo.MessageContent{{
diff --git a/examples/messages_stream/message_stream.go b/examples/messages_stream/message_stream.go
index 69cc511..90f9c11 100644
--- a/examples/messages_stream/message_stream.go
+++ b/examples/messages_stream/message_stream.go
@@ -28,7 +28,7 @@ func main() {
 	userPrompt = strings.TrimSuffix(userPrompt, "\n")
 
 	r, _, err := c.MessageStreamRequest(context.Background(), anthrogo.MessagePayload{
-		Model: anthrogo.ModelClaude3Opus,
+		Model: anthrogo.ModelClaude3Dot5Sonnet,
 		Messages: []anthrogo.Message{{
 			Role: anthrogo.RoleTypeUser,
 			Content: []anthrogo.MessageContent{{