diff --git a/internal/agent/coordinator.go b/internal/agent/coordinator.go
index a1fd6ae3dd293cac5ad65079c96bad4acd47c4f9..5acafb993d2d40860ae1ccf3992dea9c3e1b7980 100644
--- a/internal/agent/coordinator.go
+++ b/internal/agent/coordinator.go
@@ -566,14 +566,19 @@ func (c *coordinator) buildAgentModels(ctx context.Context, isSubAgent bool) (Mo
 		}, nil
 }
 
-func (c *coordinator) buildAnthropicProvider(baseURL, apiKey string, headers map[string]string) (fantasy.Provider, error) {
+func (c *coordinator) buildAnthropicProvider(baseURL, apiKey string, headers map[string]string, providerID string) (fantasy.Provider, error) {
 	var opts []anthropic.Option
 
-	if strings.HasPrefix(apiKey, "Bearer ") {
+	switch {
+	case strings.HasPrefix(apiKey, "Bearer "):
 		// NOTE: Prevent the SDK from picking up the API key from env.
 		os.Setenv("ANTHROPIC_API_KEY", "")
 		headers["Authorization"] = apiKey
-	} else if apiKey != "" {
+	case providerID == string(catwalk.InferenceProviderMiniMax):
+		// NOTE: Prevent the SDK from picking up the API key from env.
+		os.Setenv("ANTHROPIC_API_KEY", "")
+		headers["Authorization"] = "Bearer " + apiKey
+	case apiKey != "":
 		// X-Api-Key header
 		opts = append(opts, anthropic.WithAPIKey(apiKey))
 	}
@@ -793,7 +798,7 @@ func (c *coordinator) buildProvider(providerCfg config.ProviderConfig, model con
 	case openai.Name:
 		return c.buildOpenaiProvider(baseURL, apiKey, headers)
 	case anthropic.Name:
-		return c.buildAnthropicProvider(baseURL, apiKey, headers)
+		return c.buildAnthropicProvider(baseURL, apiKey, headers, providerCfg.ID)
 	case openrouter.Name:
 		return c.buildOpenrouterProvider(baseURL, apiKey, headers)
 	case vercel.Name: