diff --git a/betaassistant_test.go b/betaassistant_test.go
index 320efd0..8885f27 100644
--- a/betaassistant_test.go
+++ b/betaassistant_test.go
@@ -26,7 +26,7 @@ func TestBetaAssistantNewWithOptionalParams(t *testing.T) {
 		option.WithAPIKey("My API Key"),
 	)
 	_, err := client.Beta.Assistants.New(context.TODO(), openai.BetaAssistantNewParams{
-		Model:        openai.F(openai.ChatModelGPT4o),
+		Model:        openai.F(openai.ChatModelO1),
 		Description:  openai.F("description"),
 		Instructions: openai.F("instructions"),
 		Metadata:     openai.F[any](map[string]interface{}{}),
diff --git a/betathread_test.go b/betathread_test.go
index b4d386f..a9a3ef8 100644
--- a/betathread_test.go
+++ b/betathread_test.go
@@ -161,7 +161,7 @@ func TestBetaThreadNewAndRunWithOptionalParams(t *testing.T) {
 		MaxCompletionTokens: openai.F(int64(256)),
 		MaxPromptTokens:     openai.F(int64(256)),
 		Metadata:            openai.F[any](map[string]interface{}{}),
-		Model:               openai.F(openai.ChatModelGPT4o),
+		Model:               openai.F(openai.ChatModelO1),
 		ParallelToolCalls:   openai.F(true),
 		Temperature:         openai.F(1.000000),
 		Thread: openai.F(openai.BetaThreadNewAndRunParamsThread{
diff --git a/betathreadrun_test.go b/betathreadrun_test.go
index 13feaac..7967ddf 100644
--- a/betathreadrun_test.go
+++ b/betathreadrun_test.go
@@ -47,7 +47,7 @@ func TestBetaThreadRunNewWithOptionalParams(t *testing.T) {
 			MaxCompletionTokens: openai.F(int64(256)),
 			MaxPromptTokens:     openai.F(int64(256)),
 			Metadata:            openai.F[any](map[string]interface{}{}),
-			Model:               openai.F(openai.ChatModelGPT4o),
+			Model:               openai.F(openai.ChatModelO1),
 			ParallelToolCalls:   openai.F(true),
 			Temperature:         openai.F(1.000000),
 			ToolChoice:          openai.F[openai.AssistantToolChoiceOptionUnionParam](openai.AssistantToolChoiceOptionAuto(openai.AssistantToolChoiceOptionAutoNone)),