diff --git a/openaicompat/openaicompat.go b/openaicompat/openaicompat.go
index e3fa86afc89c6c9d2944e675ab40ef09dc6c4759..2e1af1b4a17ba3842aeb1fe3dd05c222b09fb773 100644
--- a/openaicompat/openaicompat.go
+++ b/openaicompat/openaicompat.go
@@ -17,11 +17,10 @@ const (
 
 type Option = func(*options)
 
-func New(url string, opts ...Option) ai.Provider {
+func New(opts ...Option) ai.Provider {
 	providerOptions := options{
 		openaiOptions: []openai.Option{
 			openai.WithName(Name),
-			openai.WithBaseURL(url),
 		},
 		languageModelOptions: []openai.LanguageModelOption{
 			openai.WithLanguageModelPrepareCallFunc(languagePrepareModelCall),
@@ -37,6 +36,12 @@ func New(url string, opts ...Option) ai.Provider {
 	return openai.New(providerOptions.openaiOptions...)
 }
 
+func WithBaseURL(url string) Option {
+	return func(o *options) {
+		o.openaiOptions = append(o.openaiOptions, openai.WithBaseURL(url))
+	}
+}
+
 func WithAPIKey(apiKey string) Option {
 	return func(o *options) {
 		o.openaiOptions = append(o.openaiOptions, openai.WithAPIKey(apiKey))
diff --git a/providertests/openaicompat_test.go b/providertests/openaicompat_test.go
index b0837afa56e49854be346619f4e1f1bcd66c3e25..5d954ab75d285bcc0802bd734528c670e7d8843d 100644
--- a/providertests/openaicompat_test.go
+++ b/providertests/openaicompat_test.go
@@ -44,12 +44,12 @@ func testOpenAICompatThinking(t *testing.T, result *ai.AgentResult) {
 			}
 		}
 	}
-	require.Greater(t, reasoningContentCount, 0)
+	require.Greater(t, reasoningContentCount, 0, "expected reasoning content, got none")
 }
 
 func builderXAIGrokCodeFast(r *recorder.Recorder) (ai.LanguageModel, error) {
 	provider := openaicompat.New(
-		"https://api.x.ai/v1",
+		openaicompat.WithBaseURL("https://api.x.ai/v1"),
 		openaicompat.WithAPIKey(os.Getenv("FANTASY_XAI_API_KEY")),
 		openaicompat.WithHTTPClient(&http.Client{Transport: r}),
 	)
@@ -58,7 +58,7 @@ func builderXAIGrokCodeFast(r *recorder.Recorder) (ai.LanguageModel, error) {
 
 func builderXAIGrok4Fast(r *recorder.Recorder) (ai.LanguageModel, error) {
 	provider := openaicompat.New(
-		"https://api.x.ai/v1",
+		openaicompat.WithBaseURL("https://api.x.ai/v1"),
 		openaicompat.WithAPIKey(os.Getenv("FANTASY_XAI_API_KEY")),
 		openaicompat.WithHTTPClient(&http.Client{Transport: r}),
 	)
@@ -67,7 +67,7 @@ func builderXAIGrok4Fast(r *recorder.Recorder) (ai.LanguageModel, error) {
 
 func builderXAIGrok3Mini(r *recorder.Recorder) (ai.LanguageModel, error) {
 	provider := openaicompat.New(
-		"https://api.x.ai/v1",
+		openaicompat.WithBaseURL("https://api.x.ai/v1"),
 		openaicompat.WithAPIKey(os.Getenv("FANTASY_XAI_API_KEY")),
 		openaicompat.WithHTTPClient(&http.Client{Transport: r}),
 	)
@@ -76,7 +76,7 @@ func builderXAIGrok3Mini(r *recorder.Recorder) (ai.LanguageModel, error) {
 
 func builderZAIGLM45(r *recorder.Recorder) (ai.LanguageModel, error) {
 	provider := openaicompat.New(
-		"https://api.z.ai/api/coding/paas/v4",
+		openaicompat.WithBaseURL("https://api.z.ai/api/coding/paas/v4"),
 		openaicompat.WithAPIKey(os.Getenv("FANTASY_ZAI_API_KEY")),
 		openaicompat.WithHTTPClient(&http.Client{Transport: r}),
 	)
@@ -85,7 +85,7 @@ func builderZAIGLM45(r *recorder.Recorder) (ai.LanguageModel, error) {
 
 func builderGroq(r *recorder.Recorder) (ai.LanguageModel, error) {
 	provider := openaicompat.New(
-		"https://api.groq.com/openai/v1",
+		openaicompat.WithBaseURL("https://api.groq.com/openai/v1"),
 		openaicompat.WithAPIKey(os.Getenv("FANTASY_GROQ_API_KEY")),
 		openaicompat.WithHTTPClient(&http.Client{Transport: r}),
 	)