diff --git a/pkg/config/config.go b/pkg/config/config.go
index 4dd1f9609..33919d9d7 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -939,8 +939,8 @@ type ModelConfig struct {
 	RPM            int            `json:"rpm,omitempty"`              // Requests per minute limit
 	MaxTokensField string         `json:"max_tokens_field,omitempty"` // Field name for max tokens (e.g., "max_completion_tokens")
 	RequestTimeout int            `json:"request_timeout,omitempty"`
-	ThinkingLevel  string         `json:"thinking_level,omitempty"`   // Extended thinking: off|low|medium|high|xhigh|adaptive
-	ExtraBody      map[string]any `json:"extra_body,omitempty"`       // Additional fields to inject into request body
+	ThinkingLevel  string         `json:"thinking_level,omitempty"` // Extended thinking: off|low|medium|high|xhigh|adaptive
+	ExtraBody      map[string]any `json:"extra_body,omitempty"`     // Additional fields to inject into request body
 
 	// from security
 	secModelName string
diff --git a/pkg/config/config_test.go b/pkg/config/config_test.go
index 5fc0fe8fc..9bd27e5eb 100644
--- a/pkg/config/config_test.go
+++ b/pkg/config/config_test.go
@@ -1199,11 +1199,11 @@ func TestModelConfig_ExtraBodyRoundTrip(t *testing.T) {
 	cfgPath := filepath.Join(dir, "config.json")
 
 	cfg := &Config{
-		ModelList: []ModelConfig{
+		ModelList: []*ModelConfig{
 			{
 				ModelName: "test-model",
 				Model:     "openai/test",
-				APIKey:    "sk-test",
+				apiKeys:   []string{"sk-test"},
 				ExtraBody: map[string]any{"custom_field": "value", "num_field": 42},
 			},
 		},
diff --git a/pkg/config/defaults.go b/pkg/config/defaults.go
index 2a086821a..ccfd5732a 100644
--- a/pkg/config/defaults.go
+++ b/pkg/config/defaults.go
@@ -339,7 +339,7 @@ func DefaultConfig() *Config {
 				ModelName: "MiniMax-M2.5",
 				Model:     "minimax/MiniMax-M2.5",
 				APIBase:   "https://api.minimaxi.com/v1",
-				ExtraBody:  map[string]any{"reasoning_split": true},
+				ExtraBody: map[string]any{"reasoning_split": true},
 			},
 
 			// LongCat - https://longcat.chat/platform
diff --git a/pkg/providers/factory_provider.go b/pkg/providers/factory_provider.go
index 68335a108..bc7c2ff70 100644
--- a/pkg/providers/factory_provider.go
+++ b/pkg/providers/factory_provider.go
@@ -138,7 +138,7 @@ func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, err
 
 	case "minimax":
 		// Minimax requires reasoning_split: true in the request body
-		if cfg.APIKey == "" && cfg.APIBase == "" {
+		if cfg.APIKey() == "" && cfg.APIBase == "" {
 			return nil, "", fmt.Errorf("api_key or api_base is required for HTTP-based protocol %q", protocol)
 		}
 		apiBase := cfg.APIBase
@@ -153,7 +153,7 @@ func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, err
 			extraBody["reasoning_split"] = true
 		}
 		return NewHTTPProviderWithMaxTokensFieldAndRequestTimeout(
-			cfg.APIKey,
+			cfg.APIKey(),
 			apiBase,
 			cfg.Proxy,
 			cfg.MaxTokensField,
diff --git a/pkg/providers/factory_provider_test.go b/pkg/providers/factory_provider_test.go
index 06025fba2..1bff0419d 100644
--- a/pkg/providers/factory_provider_test.go
+++ b/pkg/providers/factory_provider_test.go
@@ -622,9 +622,9 @@ func TestCreateProviderFromConfig_MinimaxInjectsReasoningSplit(t *testing.T) {
 	cfg := &config.ModelConfig{
 		ModelName: "test-minimax",
 		Model:     "minimax/MiniMax-M2.5",
-		APIKey:    "test-key",
 		APIBase:   server.URL,
 	}
+	cfg.SetAPIKey("test-key")
 
 	provider, modelID, err := CreateProviderFromConfig(cfg)
 	if err != nil {
@@ -670,10 +670,10 @@ func TestCreateProviderFromConfig_MinimaxPreservesUserExtraBody(t *testing.T) {
 	cfg := &config.ModelConfig{
 		ModelName: "test-minimax-custom",
 		Model:     "minimax/MiniMax-M2.5",
-		APIKey:    "test-key",
 		APIBase:   server.URL,
 		ExtraBody: map[string]any{"custom_field": "test"},
 	}
+	cfg.SetAPIKey("test-key")
 
 	provider, modelID, err := CreateProviderFromConfig(cfg)
 	if err != nil {
diff --git a/web/frontend/src/api/models.ts b/web/frontend/src/api/models.ts
index ff8c2e049..2fd042593 100644
--- a/web/frontend/src/api/models.ts
+++ b/web/frontend/src/api/models.ts
@@ -17,7 +17,7 @@ export interface ModelInfo {
   max_tokens_field?: string
   request_timeout?: number
   thinking_level?: string
-  extra_body?: Record<string, any>
+  extra_body?: Record<string, unknown>
   // Meta
   configured: boolean
   is_default: boolean