diff --git a/chat.go b/chat.go
index cfa86b6f3..0de0c13b0 100644
--- a/chat.go
+++ b/chat.go
@@ -68,7 +68,9 @@ func (c *Client) CreateChatCompletion(
 	request ChatCompletionRequest,
 ) (response ChatCompletionResponse, err error) {
 	model := request.Model
-	if model != GPT3Dot5Turbo0301 && model != GPT3Dot5Turbo {
+	switch model {
+	case GPT3Dot5Turbo0301, GPT3Dot5Turbo, GPT4, GPT40314, GPT432K0314, GPT432K:
+	default:
 		err = ErrChatCompletionInvalidModel
 		return
 	}
diff --git a/completion.go b/completion.go
index b060815bd..2cce97b53 100644
--- a/completion.go
+++ b/completion.go
@@ -17,6 +17,10 @@ var (
 // GPT3 Models are designed for text-based tasks. For code-specific
 // tasks, please refer to the Codex series of models.
 const (
+	GPT432K0314             = "gpt-4-32k-0314"
+	GPT432K                 = "gpt-4-32k"
+	GPT40314                = "gpt-4-0314"
+	GPT4                    = "gpt-4"
 	GPT3Dot5Turbo0301       = "gpt-3.5-turbo-0301"
 	GPT3Dot5Turbo           = "gpt-3.5-turbo"
 	GPT3TextDavinci003      = "text-davinci-003"
@@ -97,7 +101,8 @@ func (c *Client) CreateCompletion(
 	ctx context.Context,
 	request CompletionRequest,
 ) (response CompletionResponse, err error) {
-	if request.Model == GPT3Dot5Turbo0301 || request.Model == GPT3Dot5Turbo {
+	switch request.Model {
+	case GPT3Dot5Turbo0301, GPT3Dot5Turbo, GPT4, GPT40314, GPT432K0314, GPT432K:
 		err = ErrCompletionUnsupportedModel
 		return
 	}