diff --git a/answers.go b/answers.go
index fedfcad18..662a3609c 100644
--- a/answers.go
+++ b/answers.go
@@ -8,7 +8,7 @@ import (
 )
 
 type AnswerRequest struct {
-	Documents       [][]string `json:"documents"`
+	Documents       []string   `json:"documents"`
 	Question        string     `json:"question"`
 	SearchModel     string     `json:"search_model"`
 	Model           string     `json:"model"`
diff --git a/api.go b/api.go
index 1911ce461..d8e4c7e4a 100644
--- a/api.go
+++ b/api.go
@@ -59,7 +59,12 @@ func (c *Client) sendRequest(req *http.Request, v interface{}) error {
 	defer res.Body.Close()
 
 	if res.StatusCode < http.StatusOK || res.StatusCode >= http.StatusBadRequest {
-		return fmt.Errorf("error, status code: %d", res.StatusCode)
+		var errRes ErrorResponse
+		err = json.NewDecoder(res.Body).Decode(&errRes)
+		if err != nil || errRes.Error == nil {
+			return fmt.Errorf("error, status code: %d", res.StatusCode)
+		}
+		return fmt.Errorf("error, status code: %d, message: %s", res.StatusCode, errRes.Error.Message)
 	}
 
 	if err = json.NewDecoder(res.Body).Decode(&v); err != nil {
diff --git a/api_test.go b/api_test.go
index ccccccd55..23b099c38 100644
--- a/api_test.go
+++ b/api_test.go
@@ -24,6 +24,18 @@ func TestAPI(t *testing.T) {
 		t.Fatalf("GetEngine error: %v", err)
 	}
 
+	fileRes, err := c.ListFiles(ctx)
+	if err != nil {
+		t.Fatalf("ListFiles error: %v", err)
+	}
+
+	if len(fileRes.Files) > 0 {
+		_, err = c.GetFile(ctx, fileRes.Files[0].ID)
+		if err != nil {
+			t.Fatalf("GetFile error: %v", err)
+		}
+	} // else skip
+
 	req := CompletionRequest{MaxTokens: 5}
 	req.Prompt = "Lorem ipsum"
 	_, err = c.CreateCompletion(ctx, "ada", req)
diff --git a/error.go b/error.go
new file mode 100644
index 000000000..4d0a32404
--- /dev/null
+++ b/error.go
@@ -0,0 +1,10 @@
+package gogpt
+
+type ErrorResponse struct {
+	Error *struct {
+		Code    *int    `json:"code,omitempty"`
+		Message string  `json:"message"`
+		Param   *string `json:"param,omitempty"`
+		Type    string  `json:"type"`
+	} `json:"error,omitempty"`
+}
diff --git a/files.go b/files.go
new file mode 100644
index 000000000..75ed5402e
--- /dev/null
+++ b/files.go
@@ -0,0 +1,50 @@
+package gogpt
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+)
+
+// File struct represents an OpenAPI file
+type File struct {
+	Bytes     int    `json:"bytes"`
+	CreatedAt int    `json:"created_at"`
+	ID        string `json:"id"`
+	FileName  string `json:"filename"`
+	Object    string `json:"object"`
+	Owner     string `json:"owner"`
+	Purpose   string `json:"purpose"`
+}
+
+// FilesList is a list of files that belong to the user or organization
+type FilesList struct {
+	Files []File `json:"data"`
+}
+
+// ListFiles Lists the currently available files,
+// and provides basic information about each file such as the file name and purpose.
+func (c *Client) ListFiles(ctx context.Context) (files FilesList, err error) {
+	req, err := http.NewRequest("GET", c.fullURL("/files"), nil)
+	if err != nil {
+		return
+	}
+
+	req = req.WithContext(ctx)
+	err = c.sendRequest(req, &files)
+	return
+}
+
+// GetFile Retrieves a file instance, providing basic information about the file
+// such as the file name and purpose.
+func (c *Client) GetFile(ctx context.Context, fileID string) (file File, err error) {
+	urlSuffix := fmt.Sprintf("/files/%s", fileID)
+	req, err := http.NewRequest("GET", c.fullURL(urlSuffix), nil)
+	if err != nil {
+		return
+	}
+
+	req = req.WithContext(ctx)
+	err = c.sendRequest(req, &file)
+	return
+}