diff --git a/backend/internal/service/channel_service.go b/backend/internal/service/channel_service.go
index a7e9bffe3..744b8f43d 100644
--- a/backend/internal/service/channel_service.go
+++ b/backend/internal/service/channel_service.go
@@ -962,19 +962,35 @@ func conflictsBetween(a, b modelEntry) bool {
 	}
 }
 
-// toModelEntry 将模型名转换为 modelEntry
+// toModelEntry 将模型名转换为 modelEntry（用于模型映射的冲突检测）。
+// 归一化必须与 expandMappingToCache 写缓存键的方式一致：映射缓存只做 strings.ToLower。
 func toModelEntry(pattern string) modelEntry {
 	prefix, isWild := splitWildcardSuffix(strings.ToLower(pattern))
 	return modelEntry{pattern: pattern, prefix: prefix, wildcard: isWild}
 }
 
+// toPricingModelEntry 将模型名转换为 modelEntry（用于模型定价的冲突检测）。
+//
+// 与 toModelEntry 的区别：定价缓存的键走 normalizeChannelPricingModelName
+// （额外做 TrimSpace，并把 claude-* 的 "." 换成 "-"），冲突检测必须用同一套归一化，
+// 否则两个校验时看着不同、写进缓存后键相同的定价会互相静默覆盖。
+func toPricingModelEntry(pattern string) modelEntry {
+	// 先剥通配符再归一化，与 expandPricingToCache 的处理顺序保持一致
+	prefix, isWild := splitWildcardSuffix(pattern)
+	return modelEntry{
+		pattern:  pattern,
+		prefix:   normalizeChannelPricingModelName(prefix),
+		wildcard: isWild,
+	}
+}
+
 // validateNoConflictingModels 检查定价列表中是否有冲突模型模式（同一平台下）。
 // 冲突包括：精确重复、通配符之间的前缀包含、通配符与精确名的前缀匹配。
 func validateNoConflictingModels(pricingList []ChannelModelPricing) error {
 	byPlatform := make(map[string][]modelEntry)
 	for _, p := range pricingList {
 		for _, model := range p.Models {
-			byPlatform[p.Platform] = append(byPlatform[p.Platform], toModelEntry(model))
+			byPlatform[p.Platform] = append(byPlatform[p.Platform], toPricingModelEntry(model))
 		}
 	}
 	for platform, entries := range byPlatform {
diff --git a/backend/internal/service/channel_service_test.go b/backend/internal/service/channel_service_test.go
index a89e5063a..f56f61e91 100644
--- a/backend/internal/service/channel_service_test.go
+++ b/backend/internal/service/channel_service_test.go
@@ -414,6 +414,44 @@ func TestValidateNoConflictingModels(t *testing.T) {
 			wantErr:     true,
 			errContains: "conflict",
 		},
+		// 以下三例：冲突检测必须与 normalizeChannelPricingModelName 用同一套归一化，
+		// 否则校验放行、写进缓存后键相同，后写的定价会静默覆盖前一条。
+		{
+			name: "claude_dot_and_hyphen_spelling_conflict",
+			pricingList: []ChannelModelPricing{
+				{Platform: "anthropic", Models: []string{"claude-sonnet-4.5"}},
+				{Platform: "anthropic", Models: []string{"claude-sonnet-4-5"}},
+			},
+			wantErr:     true,
+			errContains: "conflict",
+		},
+		{
+			name: "claude_dot_and_hyphen_spelling_conflict_wildcard",
+			pricingList: []ChannelModelPricing{
+				{Platform: "anthropic", Models: []string{"claude-sonnet-4.5*"}},
+				{Platform: "anthropic", Models: []string{"claude-sonnet-4-5-x"}},
+			},
+			wantErr:     true,
+			errContains: "conflict",
+		},
+		{
+			name: "surrounding_whitespace_conflict",
+			pricingList: []ChannelModelPricing{
+				{Platform: "openai", Models: []string{"gpt-5.6"}},
+				{Platform: "openai", Models: []string{" gpt-5.6 "}},
+			},
+			wantErr:     true,
+			errContains: "conflict",
+		},
+		{
+			// 只有 claude-* 前缀才做 "." → "-"，别把其它平台也一起归一化了
+			name: "non_claude_dot_spelling_is_not_normalized",
+			pricingList: []ChannelModelPricing{
+				{Platform: "openai", Models: []string{"gpt-5.6"}},
+				{Platform: "openai", Models: []string{"gpt-5-6"}},
+			},
+			wantErr: false,
+		},
 	}
 
 	for _, tt := range tests {
@@ -469,6 +507,16 @@ func TestValidateNoConflictingMappings(t *testing.T) {
 			wantErr:     true,
 			errContains: "conflict",
 		},
+		{
+			// 映射缓存（expandMappingToCache）只做 strings.ToLower，不做定价那套
+			// "." → "-"，所以这两个源模式在缓存里是两个不同的键、并不冲突。
+			// 这条用来卡住：定价侧的归一化修复不能顺手套到映射侧，否则会误报冲突。
+			name: "mapping keeps dot and hyphen spelling separate",
+			mapping: map[string]map[string]string{
+				"anthropic": {"claude-sonnet-4.5": "a", "claude-sonnet-4-5": "b"},
+			},
+			wantErr: false,
+		},
 		{
 			name: "wildcard vs exact conflict",
 			mapping: map[string]map[string]string{