fix model parse

.gitignore

@@ -44,3 +44,5 @@ tasks/
 
 # Added by goreleaser init:
 dist/
+.gocache
+.gomodcache

pkg/providers/factory_provider_test.go

@@ -60,6 +60,12 @@ func TestExtractProtocol(t *testing.T) {
 			wantProtocol: "nvidia",
 			wantModelID:  "meta/llama-3.1-8b",
 		},
+		{
+			name:         "openrouter nested model path with suffix",
+			model:        "openrouter/stepfun/step-3.5-flash:free",
+			wantProtocol: "openrouter",
+			wantModelID:  "stepfun/step-3.5-flash:free",
+		},
 	}
 
 	for _, tt := range tests {
@@ -95,6 +101,28 @@ func TestCreateProviderFromConfig_OpenAI(t *testing.T) {
 	}
 }
 
+func TestCreateProviderFromConfig_OpenRouterNestedModelPath(t *testing.T) {
+	cfg := &config.ModelConfig{
+		ModelName: "test-openrouter-step",
+		Model:     "openrouter/stepfun/step-3.5-flash:free",
+		APIKey:    "test-key",
+	}
+
+	provider, modelID, err := CreateProviderFromConfig(cfg)
+	if err != nil {
+		t.Fatalf("CreateProviderFromConfig() error = %v", err)
+	}
+	if provider == nil {
+		t.Fatal("CreateProviderFromConfig() returned nil provider")
+	}
+	if _, ok := provider.(*HTTPProvider); !ok {
+		t.Fatalf("expected *HTTPProvider, got %T", provider)
+	}
+	if modelID != "stepfun/step-3.5-flash:free" {
+		t.Errorf("modelID = %q, want %q", modelID, "stepfun/step-3.5-flash:free")
+	}
+}
+
 func TestCreateProviderFromConfig_DefaultAPIBase(t *testing.T) {
 	tests := []struct {
 		name     string

pkg/providers/model_ref.go

@@ -18,12 +18,15 @@ func ParseModelRef(raw string, defaultProvider string) *ModelRef {
 	}
 
 	if idx := strings.Index(raw, "/"); idx > 0 {
-		provider := NormalizeProvider(raw[:idx])
+		prefix := strings.TrimSpace(raw[:idx])
-		model := strings.TrimSpace(raw[idx+1:])
+		if isKnownProviderPrefix(prefix) {
-		if model == "" {
+			provider := NormalizeProvider(prefix)
-			return nil
+			model := strings.TrimSpace(raw[idx+1:])
+			if model == "" {
+				return nil
+			}
+			return &ModelRef{Provider: provider, Model: model}
 		}
-		return &ModelRef{Provider: provider, Model: model}
 	}
 
 	return &ModelRef{
@@ -32,6 +35,19 @@ func ParseModelRef(raw string, defaultProvider string) *ModelRef {
 	}
 }
 
+func isKnownProviderPrefix(prefix string) bool {
+	switch NormalizeProvider(prefix) {
+	case "openai", "anthropic", "openrouter", "groq", "zhipu", "gemini",
+		"nvidia", "ollama", "moonshot", "shengsuanyun", "deepseek", "cerebras",
+		"volcengine", "vllm", "qwen-portal", "mistral", "antigravity",
+		"claude-cli", "claudecli", "codex-cli", "codexcli", "github-copilot",
+		"github_copilot", "copilot", "zai", "opencode", "kimi-coding":
+		return true
+	default:
+		return false
+	}
+}
+
 // NormalizeProvider normalizes provider identifiers to canonical form.
 func NormalizeProvider(provider string) string {
 	p := strings.ToLower(strings.TrimSpace(provider))

pkg/providers/model_ref_test.go

@@ -123,3 +123,29 @@ func TestParseModelRef_DefaultProviderNormalization(t *testing.T) {
 		t.Errorf("provider = %q, want openai (normalized from GPT)", ref.Provider)
 	}
 }
+
+func TestParseModelRef_OpenRouterNestedModelWithExplicitProvider(t *testing.T) {
+	ref := ParseModelRef("openrouter/stepfun/step-3.5-flash:free", "openai")
+	if ref == nil {
+		t.Fatal("expected non-nil ref")
+	}
+	if ref.Provider != "openrouter" {
+		t.Errorf("provider = %q, want openrouter", ref.Provider)
+	}
+	if ref.Model != "stepfun/step-3.5-flash:free" {
+		t.Errorf("model = %q, want stepfun/step-3.5-flash:free", ref.Model)
+	}
+}
+
+func TestParseModelRef_UnknownPrefixUsesDefaultProvider(t *testing.T) {
+	ref := ParseModelRef("stepfun/step-3.5-flash:free", "openrouter")
+	if ref == nil {
+		t.Fatal("expected non-nil ref")
+	}
+	if ref.Provider != "openrouter" {
+		t.Errorf("provider = %q, want openrouter", ref.Provider)
+	}
+	if ref.Model != "stepfun/step-3.5-flash:free" {
+		t.Errorf("model = %q, want stepfun/step-3.5-flash:free", ref.Model)
+	}
+}