diff --git a/embeddings_test.go b/embeddings_test.go
index ed6384f3f..438978169 100644
--- a/embeddings_test.go
+++ b/embeddings_test.go
@@ -169,7 +169,7 @@ func TestAzureEmbeddingEndpoint(t *testing.T) {
 
 	server.RegisterHandler(
 		"/openai/deployments/text-embedding-ada-002/embeddings",
-		func(w http.ResponseWriter, r *http.Request) {
+		func(w http.ResponseWriter, _ *http.Request) {
 			resBytes, _ := json.Marshal(openai.EmbeddingResponse{Data: sampleEmbeddings})
 			fmt.Fprintln(w, string(resBytes))
 		},
diff --git a/files_api_test.go b/files_api_test.go
index 6f62a3fbc..c92162a84 100644
--- a/files_api_test.go
+++ b/files_api_test.go
@@ -86,7 +86,7 @@ func handleCreateFile(w http.ResponseWriter, r *http.Request) {
 func TestDeleteFile(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/files/deadbeef", func(w http.ResponseWriter, r *http.Request) {})
+	server.RegisterHandler("/v1/files/deadbeef", func(http.ResponseWriter, *http.Request) {})
 	err := client.DeleteFile(context.Background(), "deadbeef")
 	checks.NoError(t, err, "DeleteFile error")
 }
@@ -94,7 +94,7 @@ func TestDeleteFile(t *testing.T) {
 func TestListFile(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/files", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/files", func(w http.ResponseWriter, _ *http.Request) {
 		resBytes, _ := json.Marshal(openai.FilesList{})
 		fmt.Fprintln(w, string(resBytes))
 	})
@@ -105,7 +105,7 @@ func TestListFile(t *testing.T) {
 func TestGetFile(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/files/deadbeef", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/files/deadbeef", func(w http.ResponseWriter, _ *http.Request) {
 		resBytes, _ := json.Marshal(openai.File{})
 		fmt.Fprintln(w, string(resBytes))
 	})
@@ -151,7 +151,7 @@ func TestGetFileContentReturnError(t *testing.T) {
 }`
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/files/deadbeef/content", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/files/deadbeef/content", func(w http.ResponseWriter, _ *http.Request) {
 		w.WriteHeader(http.StatusBadRequest)
 		fmt.Fprint(w, wantErrorResp)
 	})
@@ -178,7 +178,7 @@ func TestGetFileContentReturnError(t *testing.T) {
 func TestGetFileContentReturnTimeoutError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/files/deadbeef/content", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/files/deadbeef/content", func(http.ResponseWriter, *http.Request) {
 		time.Sleep(10 * time.Nanosecond)
 	})
 	ctx := context.Background()
diff --git a/image_test.go b/image_test.go
index 81fff6cba..9332dd5cd 100644
--- a/image_test.go
+++ b/image_test.go
@@ -60,7 +60,7 @@ func TestImageFormBuilderFailures(t *testing.T) {
 	_, err := client.CreateEditImage(ctx, req)
 	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")
 
-	mockBuilder.mockCreateFormFile = func(name string, file *os.File) error {
+	mockBuilder.mockCreateFormFile = func(name string, _ *os.File) error {
 		if name == "mask" {
 			return mockFailedErr
 		}
@@ -69,12 +69,12 @@ func TestImageFormBuilderFailures(t *testing.T) {
 	_, err = client.CreateEditImage(ctx, req)
 	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")
 
-	mockBuilder.mockCreateFormFile = func(name string, file *os.File) error {
+	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
 		return nil
 	}
 
 	var failForField string
-	mockBuilder.mockWriteField = func(fieldname, value string) error {
+	mockBuilder.mockWriteField = func(fieldname, _ string) error {
 		if fieldname == failForField {
 			return mockFailedErr
 		}
@@ -125,12 +125,12 @@ func TestVariImageFormBuilderFailures(t *testing.T) {
 	_, err := client.CreateVariImage(ctx, req)
 	checks.ErrorIs(t, err, mockFailedErr, "CreateVariImage should return error if form builder fails")
 
-	mockBuilder.mockCreateFormFile = func(name string, file *os.File) error {
+	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
 		return nil
 	}
 
 	var failForField string
-	mockBuilder.mockWriteField = func(fieldname, value string) error {
+	mockBuilder.mockWriteField = func(fieldname, _ string) error {
 		if fieldname == failForField {
 			return mockFailedErr
 		}
diff --git a/messages.go b/messages.go
index ead247f5b..861463235 100644
--- a/messages.go
+++ b/messages.go
@@ -18,7 +18,7 @@ type Message struct {
 	ThreadID    string           `json:"thread_id"`
 	Role        string           `json:"role"`
 	Content     []MessageContent `json:"content"`
-	FileIds     []string         `json:"file_ids"`
+	FileIds     []string         `json:"file_ids"` //nolint:revive //backwards-compatibility
 	AssistantID *string          `json:"assistant_id,omitempty"`
 	RunID       *string          `json:"run_id,omitempty"`
 	Metadata    map[string]any   `json:"metadata"`
@@ -54,7 +54,7 @@ type ImageFile struct {
 type MessageRequest struct {
 	Role     string         `json:"role"`
 	Content  string         `json:"content"`
-	FileIds  []string       `json:"file_ids,omitempty"`
+	FileIds  []string       `json:"file_ids,omitempty"` //nolint:revive // backwards-compatibility
 	Metadata map[string]any `json:"metadata,omitempty"`
 }
 
diff --git a/models_test.go b/models_test.go
index 4a4c759dc..24a28ed23 100644
--- a/models_test.go
+++ b/models_test.go
@@ -64,7 +64,7 @@ func handleGetModelEndpoint(w http.ResponseWriter, _ *http.Request) {
 func TestGetModelReturnTimeoutError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/models/text-davinci-003", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/models/text-davinci-003", func(http.ResponseWriter, *http.Request) {
 		time.Sleep(10 * time.Nanosecond)
 	})
 	ctx := context.Background()
diff --git a/run.go b/run.go
index ddcd06b84..1f3cb7eb7 100644
--- a/run.go
+++ b/run.go
@@ -24,8 +24,9 @@ type Run struct {
 	Model          string             `json:"model"`
 	Instructions   string             `json:"instructions,omitempty"`
 	Tools          []Tool             `json:"tools"`
-	FileIDS        []string           `json:"file_ids"`
+	FileIDS        []string           `json:"file_ids"` //nolint:revive // backwards-compatibility
 	Metadata       map[string]any     `json:"metadata"`
+	Usage          Usage              `json:"usage,omitempty"`
 
 	httpHeader
 }
diff --git a/speech.go b/speech.go
index f2442b921..b9344ac66 100644
--- a/speech.go
+++ b/speech.go
@@ -74,7 +74,7 @@ func (c *Client) CreateSpeech(ctx context.Context, request CreateSpeechRequest)
 		err = ErrInvalidVoice
 		return
 	}
-	req, err := c.newRequest(ctx, http.MethodPost, c.fullURL("/audio/speech", request.Model),
+	req, err := c.newRequest(ctx, http.MethodPost, c.fullURL("/audio/speech", string(request.Model)),
 		withBody(request),
 		withContentType("application/json; charset=utf-8"),
 	)
diff --git a/stream_test.go b/stream_test.go
index 35c52ae3b..2822a3535 100644
--- a/stream_test.go
+++ b/stream_test.go
@@ -34,7 +34,7 @@ func TestCompletionsStreamWrongModel(t *testing.T) {
 func TestCreateCompletionStream(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "text/event-stream")
 
 		// Send test responses
@@ -106,7 +106,7 @@ func TestCreateCompletionStream(t *testing.T) {
 func TestCreateCompletionStreamError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "text/event-stream")
 
 		// Send test responses
@@ -151,7 +151,7 @@ func TestCreateCompletionStreamError(t *testing.T) {
 func TestCreateCompletionStreamRateLimitError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(429)
 
@@ -182,7 +182,7 @@ func TestCreateCompletionStreamRateLimitError(t *testing.T) {
 func TestCreateCompletionStreamTooManyEmptyStreamMessagesError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "text/event-stream")
 
 		// Send test responses
@@ -228,7 +228,7 @@ func TestCreateCompletionStreamTooManyEmptyStreamMessagesError(t *testing.T) {
 func TestCreateCompletionStreamUnexpectedTerminatedError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "text/event-stream")
 
 		// Send test responses
@@ -263,7 +263,7 @@ func TestCreateCompletionStreamUnexpectedTerminatedError(t *testing.T) {
 func TestCreateCompletionStreamBrokenJSONError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "text/event-stream")
 
 		// Send test responses
@@ -305,7 +305,7 @@ func TestCreateCompletionStreamBrokenJSONError(t *testing.T) {
 func TestCreateCompletionStreamReturnTimeoutError(t *testing.T) {
 	client, server, teardown := setupOpenAITestServer()
 	defer teardown()
-	server.RegisterHandler("/v1/completions", func(w http.ResponseWriter, r *http.Request) {
+	server.RegisterHandler("/v1/completions", func(http.ResponseWriter, *http.Request) {
 		time.Sleep(10 * time.Nanosecond)
 	})
 	ctx := context.Background()