diff --git a/chat.go b/chat.go
index c74f979..52ae329 100644
--- a/chat.go
+++ b/chat.go
@@ -44,7 +44,7 @@ const (
 
 type ChatCompletionRequest struct {
 	// (Required)
-	// ID of the model to use. Currently, only gpt-3.5-turbo and gpt-3.5-turbo-0301 are supported.
+	// ID of the model to use.
 	Model ChatGPTModel `json:"model"`
 
 	// Required
@@ -157,16 +157,22 @@ func validate(req *ChatCompletionRequest) error {
 		return chatgpt_errors.ErrNoMessages
 	}
 
+	isAllowed := false
+
 	allowedModels := []ChatGPTModel{
 		GPT35Turbo, GPT35Turbo0301, GPT35Turbo0613, GPT35Turbo16k, GPT35Turbo16k0613, GPT4, GPT4_0314, GPT4_0613, GPT4_32k, GPT4_32k_0314, GPT4_32k_0613,
 	}
 
 	for _, model := range allowedModels {
-		if req.Model != model {
-			return chatgpt_errors.ErrInvalidModel
+		if req.Model == model {
+			isAllowed = true
 		}
 	}
 
+	if !isAllowed {
+		return chatgpt_errors.ErrInvalidModel
+	}
+
 	for _, message := range req.Messages {
 		if message.Role != ChatGPTModelRoleUser && message.Role != ChatGPTModelRoleSystem && message.Role != ChatGPTModelRoleAssistant {
 			return chatgpt_errors.ErrInvalidRole
diff --git a/go.mod b/go.mod
index d8bca31..194e77e 100644
--- a/go.mod
+++ b/go.mod
@@ -2,10 +2,10 @@ module github.com/ayush6624/go-chatgpt
 
 go 1.20
 
+require github.com/stretchr/testify v1.8.2
+
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/objx v0.5.0 // indirect
-	github.com/stretchr/testify v1.8.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index a788369..6a56e69 100644
--- a/go.sum
+++ b/go.sum
@@ -5,12 +5,12 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0 h1:1zr/of2m5FGMsad5YfcqgdqdWrIhu+EBEJRhR1U7z/c=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/utils/errors.go b/utils/errors.go
index 59ca836..85a4d09 100644
--- a/utils/errors.go
+++ b/utils/errors.go
@@ -7,7 +7,7 @@ var (
 	ErrAPIKeyRequired = errors.New("API Key is required")
 
 	// ErrInvalidModel is returned when the model is invalid
-	ErrInvalidModel = errors.New("invalid model. Only `gpt-3.5-turbo` and `gpt-3.5-turbo-0301` are supported")
+	ErrInvalidModel = errors.New("invalid model")
 
 	// ErrNoMessages is returned when no messages are provided
 	ErrNoMessages = errors.New("no messages provided")