diff --git a/completion.go b/completion.go
index a64de0f3..a549f20f 100644
--- a/completion.go
+++ b/completion.go
@@ -133,6 +133,7 @@ const (
 	CompletionChoiceFinishReasonStop          CompletionChoiceFinishReason = "stop"
 	CompletionChoiceFinishReasonLength        CompletionChoiceFinishReason = "length"
 	CompletionChoiceFinishReasonContentFilter CompletionChoiceFinishReason = "content_filter"
+	CompletionChoiceFinishReasonToolCalls     CompletionChoiceFinishReason = "tool_calls"
 )
 
 type CompletionChoiceLogprobs struct {