diff --git a/internal/cli/cli_test.go b/internal/cli/cli_test.go
index 0193013..0008cd5 100644
--- a/internal/cli/cli_test.go
+++ b/internal/cli/cli_test.go
@@ -1,6 +1,7 @@
 package cli
 
 import (
+	"bytes"
 	"os"
 	"path/filepath"
 	"testing"
@@ -165,3 +166,57 @@ func TestProviderEnableDisableCommands(t *testing.T) {
 		t.Fatalf("provider after enable = %#v, want disabled=false", provider)
 	}
 }
+
+func TestOpencodeSyncDoesNotPanicOnSliceModelMetadata(t *testing.T) {
+	t.Setenv("OLPX_CONFIG", filepath.Join(t.TempDir(), "olpx.json"))
+	configPath = ""
+
+	cfg, err := loadCfg()
+	if err != nil {
+		t.Fatalf("loadCfg: %v", err)
+	}
+	cfg.UpsertProvider(config.Provider{
+		ID:      "p1",
+		BaseURL: "https://example.com/v1",
+	})
+	cfg.UpsertAlias(config.Alias{
+		Alias:   "gpt-5.4",
+		Enabled: true,
+		Targets: []config.Target{{Provider: "p1", Model: "up-1", Enabled: true}},
+	})
+	if err := cfg.Save(); err != nil {
+		t.Fatalf("save config: %v", err)
+	}
+
+	target := filepath.Join(t.TempDir(), "opencode.jsonc")
+	seed := []byte("{\n  \"$schema\": \"https://opencode.ai/config.json\",\n  \"provider\": {\n    \"olpx\": {\n      \"npm\": \"@ai-sdk/openai\",\n      \"name\": \"OpenCode LocalProxy CLI\",\n      \"options\": {\n        \"baseURL\": \"http://127.0.0.1:9982/v1\",\n        \"apiKey\": \"olpx-local\",\n        \"setCacheKey\": true\n      },\n      \"models\": {\n        \"gpt-5.4\": {\n          \"name\": \"custom-display-name\",\n          \"tags\": [\"reasoning\", \"priority\"],\n          \"variants\": [\n            {\"name\": \"high\", \"effort\": \"high\"}\n          ]\n        }\n      }\n    }\n  }\n}\n")
+	if err := os.WriteFile(target, seed, 0o600); err != nil {
+		t.Fatalf("write target config: %v", err)
+	}
+
+	cmd := newOpencodeSyncCmd()
+	var stdout bytes.Buffer
+	cmd.SetOut(&stdout)
+	cmd.SetErr(&stdout)
+	cmd.SetArgs([]string{"--target", target})
+
+	defer func() {
+		if r := recover(); r != nil {
+			t.Fatalf("opencode sync panicked with slice metadata: %v", r)
+		}
+	}()
+
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("execute opencode sync: %v", err)
+	}
+	if got := stdout.String(); got != "✓ no changes required at "+target+"\n" {
+		t.Fatalf("stdout = %q", got)
+	}
+	data, err := os.ReadFile(target)
+	if err != nil {
+		t.Fatalf("read target config: %v", err)
+	}
+	if !bytes.Equal(data, seed) {
+		t.Fatalf("sync rewrote unchanged config:\n%s", string(data))
+	}
+}
diff --git a/internal/opencode/opencode.go b/internal/opencode/opencode.go
index d4aa4fb..63b1ed1 100644
--- a/internal/opencode/opencode.go
+++ b/internal/opencode/opencode.go
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"reflect"
 	"sort"
 
 	"github.com/tidwall/jsonc"
@@ -601,25 +602,5 @@ func ImportCustomProviders(raw Raw) []ImportableProvider {
 
 // mapsEqualShallow compares two string-keyed maps for structural equality.
 func mapsEqualShallow(a, b map[string]any) bool {
-	if len(a) != len(b) {
-		return false
-	}
-	for k, v := range a {
-		bv, ok := b[k]
-		if !ok {
-			return false
-		}
-		am, amOk := v.(map[string]any)
-		bm, bmOk := bv.(map[string]any)
-		if amOk && bmOk {
-			if !mapsEqualShallow(am, bm) {
-				return false
-			}
-			continue
-		}
-		if v != bv {
-			return false
-		}
-	}
-	return true
+	return reflect.DeepEqual(a, b)
 }
diff --git a/internal/opencode/opencode_test.go b/internal/opencode/opencode_test.go
index 6a3646d..a16fe1b 100644
--- a/internal/opencode/opencode_test.go
+++ b/internal/opencode/opencode_test.go
@@ -142,6 +142,43 @@ func TestEnsureOLPXProviderPreservesExistingModelMetadata(t *testing.T) {
 	}
 }
 
+func TestEnsureOLPXProviderDoesNotPanicOnComparableMetadata(t *testing.T) {
+	raw := Raw{
+		"$schema": "https://opencode.ai/config.json",
+		"provider": map[string]any{
+			"olpx": map[string]any{
+				"npm":  "@ai-sdk/openai",
+				"name": "OpenCode LocalProxy CLI",
+				"options": map[string]any{
+					"baseURL":     "http://127.0.0.1:9982/v1",
+					"apiKey":      "olpx-local",
+					"setCacheKey": true,
+				},
+				"models": map[string]any{
+					"gpt-5.4": map[string]any{
+						"name": "custom-display-name",
+						"tags": []any{"reasoning", "priority"},
+						"variants": []any{
+							map[string]any{"name": "high", "effort": "high"},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	defer func() {
+		if r := recover(); r != nil {
+			t.Fatalf("EnsureOLPXProvider() panicked with slice metadata: %v", r)
+		}
+	}()
+
+	changed := EnsureOLPXProvider(raw, "http://127.0.0.1:9982/v1", "olpx-local", []string{"gpt-5.4"})
+	if changed {
+		t.Fatal("EnsureOLPXProvider() reported change for unchanged alias metadata with slices")
+	}
+}
+
 func TestValidateOLPXProviderAllowsCustomModelMetadata(t *testing.T) {
 	raw := Raw{
 		"provider": map[string]any{