diff --git a/api_test.go b/api_test.go
index 45d888f..f1950df 100644
--- a/api_test.go
+++ b/api_test.go
@@ -236,7 +236,7 @@ func handleEditEndpoint(w http.ResponseWriter, r *http.Request) {
 	// create a response
 	res := EditsResponse{
 		Object:  "test-object",
-		Created: uint64(time.Now().Unix()),
+		Created: time.Now().Unix(),
 	}
 	// edit and calculate token usage
 	editString := "edited by mocked OpenAI server :)"
@@ -275,7 +275,7 @@ func handleCompletionEndpoint(w http.ResponseWriter, r *http.Request) {
 	res := CompletionResponse{
 		ID:      strconv.Itoa(int(time.Now().Unix())),
 		Object:  "test-object",
-		Created: uint64(time.Now().Unix()),
+		Created: time.Now().Unix(),
 		// would be nice to validate Model during testing, but
 		// this may not be possible with how much upkeep
 		// would be required / wouldn't make much sense
@@ -334,7 +334,7 @@ func handleImageEndpoint(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	res := ImageResponse{
-		Created: uint64(time.Now().Unix()),
+		Created: time.Now().Unix(),
 	}
 	for i := 0; i < imageReq.N; i++ {
 		imageData := ImageResponseDataInner{}
diff --git a/completion.go b/completion.go
index 97601c3..fdf2a27 100644
--- a/completion.go
+++ b/completion.go
@@ -75,7 +75,7 @@ type LogprobResult struct {
 type CompletionResponse struct {
 	ID      string             `json:"id"`
 	Object  string             `json:"object"`
-	Created uint64             `json:"created"`
+	Created int64              `json:"created"`
 	Model   string             `json:"model"`
 	Choices []CompletionChoice `json:"choices"`
 	Usage   Usage              `json:"usage"`
diff --git a/edits.go b/edits.go
index 8101429..0ae61cd 100644
--- a/edits.go
+++ b/edits.go
@@ -26,7 +26,7 @@ type EditsChoice struct {
 // EditsResponse represents a response structure for Edits API.
 type EditsResponse struct {
 	Object  string        `json:"object"`
-	Created uint64        `json:"created"`
+	Created int64         `json:"created"`
 	Usage   Usage         `json:"usage"`
 	Choices []EditsChoice `json:"choices"`
 }
diff --git a/files.go b/files.go
index 672f060..bc27e65 100644
--- a/files.go
+++ b/files.go
@@ -21,7 +21,7 @@ type FileRequest struct {
 // File struct represents an OpenAPI file.
 type File struct {
 	Bytes     int    `json:"bytes"`
-	CreatedAt int    `json:"created_at"`
+	CreatedAt int64  `json:"created_at"`
 	ID        string `json:"id"`
 	FileName  string `json:"filename"`
 	Object    string `json:"object"`
diff --git a/image.go b/image.go
index 335e82f..e71e0a1 100644
--- a/image.go
+++ b/image.go
@@ -30,7 +30,7 @@ type ImageRequest struct {
 
 // ImageResponse represents a response structure for image API.
 type ImageResponse struct {
-	Created uint64                   `json:"created,omitempty"`
+	Created int64                    `json:"created,omitempty"`
 	Data    []ImageResponseDataInner `json:"data,omitempty"`
 }
 
diff --git a/models.go b/models.go
index ccf2eec..cd4a866 100644
--- a/models.go
+++ b/models.go
@@ -7,7 +7,7 @@ import (
 
 // Model struct represents an OpenAPI model.
 type Model struct {
-	CreatedAt  int          `json:"created_at"`
+	CreatedAt  int64        `json:"created_at"`
 	ID         string       `json:"id"`
 	Object     string       `json:"object"`
 	OwnedBy    string       `json:"owned_by"`
@@ -18,7 +18,7 @@ type Model struct {
 
 // Permission struct represents an OpenAPI permission.
 type Permission struct {
-	CreatedAt          int         `json:"created_at"`
+	CreatedAt          int64       `json:"created_at"`
 	ID                 string      `json:"id"`
 	Object             string      `json:"object"`
 	AllowCreateEngine  bool        `json:"allow_create_engine"`