diff --git a/relay/common/override.go b/relay/common/override.go
index 558fd55a..b1a7d177 100644
--- a/relay/common/override.go
+++ b/relay/common/override.go
@@ -2094,6 +2094,10 @@ func mergeObjects(data []byte, path string, value interface{}, keepOrigin bool)
 // 目前内置以下字段：
 //   - upstream_model/model：始终为通道映射后的上游模型名。
 //   - original_model：请求最初指定的模型名。
+//   - user_id：已认证用户 ID。
+//   - user_group：用户所属分组。
+//   - token_group：令牌指定的分组；未指定时回退为用户分组。
+//   - using_group：当前实际使用的分组，自动跨分组重试时可能变化。
 //   - request_path：请求路径
 //   - is_channel_test：是否为渠道测试请求（同 is_test）。
 func BuildParamOverrideContext(info *RelayInfo) map[string]interface{} {
@@ -2102,6 +2106,10 @@ func BuildParamOverrideContext(info *RelayInfo) map[string]interface{} {
 	}
 
 	ctx := make(map[string]interface{})
+	ctx["user_id"] = info.UserId
+	ctx["user_group"] = info.UserGroup
+	ctx["token_group"] = info.TokenGroup
+	ctx["using_group"] = info.UsingGroup
 	if info.ChannelMeta != nil && info.ChannelMeta.UpstreamModelName != "" {
 		ctx["model"] = info.ChannelMeta.UpstreamModelName
 		ctx["upstream_model"] = info.ChannelMeta.UpstreamModelName
diff --git a/relay/common/override_test.go b/relay/common/override_test.go
index e1f84eaf..19af348d 100644
--- a/relay/common/override_test.go
+++ b/relay/common/override_test.go
@@ -1260,6 +1260,116 @@ func TestApplyParamOverrideConditionFromRetryAndLastErrorContext(t *testing.T) {
 	assertJSONEqual(t, `{"temperature":0.1}`, string(out))
 }
 
+func TestApplyParamOverrideConditionByUserAndGPTModel(t *testing.T) {
+	paramOverride := map[string]interface{}{
+		"operations": []interface{}{
+			map[string]interface{}{
+				"path":  "service_tier",
+				"mode":  "set",
+				"value": "priority",
+				"logic": "AND",
+				"conditions": []interface{}{
+					map[string]interface{}{
+						"path":  "user_id",
+						"mode":  "full",
+						"value": 1,
+					},
+					map[string]interface{}{
+						"path":  "upstream_model",
+						"mode":  "contains",
+						"value": "gpt",
+					},
+				},
+			},
+		},
+	}
+
+	tests := []struct {
+		name     string
+		userID   int
+		model    string
+		expected string
+	}{
+		{
+			name:     "target user and GPT model",
+			userID:   1,
+			model:    "gpt-5.2",
+			expected: `{"model":"gpt-5.2","service_tier":"priority"}`,
+		},
+		{
+			name:     "other user",
+			userID:   2,
+			model:    "gpt-5.2",
+			expected: `{"model":"gpt-5.2"}`,
+		},
+		{
+			name:     "non-GPT model",
+			userID:   1,
+			model:    "claude-sonnet-4-5",
+			expected: `{"model":"claude-sonnet-4-5"}`,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			info := &RelayInfo{
+				UserId: tt.userID,
+				ChannelMeta: &ChannelMeta{
+					ParamOverride:     paramOverride,
+					UpstreamModelName: tt.model,
+				},
+			}
+			input := []byte(fmt.Sprintf(`{"model":%q}`, tt.model))
+
+			out, err := ApplyParamOverrideWithRelayInfo(input, info)
+
+			require.NoError(t, err)
+			require.JSONEq(t, tt.expected, string(out))
+		})
+	}
+}
+
+func TestApplyParamOverrideConditionByGroupContext(t *testing.T) {
+	info := &RelayInfo{
+		UserGroup:  "vip",
+		TokenGroup: "premium",
+		UsingGroup: "priority-route",
+	}
+	ctx := BuildParamOverrideContext(info)
+	paramOverride := map[string]interface{}{
+		"operations": []interface{}{
+			map[string]interface{}{
+				"path":  "service_tier",
+				"mode":  "set",
+				"value": "priority",
+				"logic": "AND",
+				"conditions": []interface{}{
+					map[string]interface{}{
+						"path":  "user_group",
+						"mode":  "full",
+						"value": "vip",
+					},
+					map[string]interface{}{
+						"path":  "token_group",
+						"mode":  "full",
+						"value": "premium",
+					},
+					map[string]interface{}{
+						"path":  "using_group",
+						"mode":  "full",
+						"value": "priority-route",
+					},
+				},
+			},
+		},
+	}
+
+	out, err := ApplyParamOverride([]byte(`{"model":"gpt-5.2"}`), paramOverride, ctx)
+
+	require.NoError(t, err)
+	require.JSONEq(t, `{"model":"gpt-5.2","service_tier":"priority"}`, string(out))
+}
+
 func TestApplyParamOverrideConditionFromRequestHeaders(t *testing.T) {
 	input := []byte(`{"temperature":0.7}`)
 	override := map[string]interface{}{