diff --git a/docs/docs.go b/docs/docs.go
index 489bf98..8f4fc4e 100644
--- a/docs/docs.go
+++ b/docs/docs.go
@@ -861,7 +861,7 @@ const docTemplate = `{
                         "AdminAuth": []
                     }
                 ],
-                "description": "List request logs with basic filtering/pagination",
+                "description": "List request logs with basic filtering/pagination. Returns full log records including request_body.",
                 "produces": [
                     "application/json"
                 ],
@@ -923,7 +923,7 @@ const docTemplate = `{
                     "200": {
                         "description": "OK",
                         "schema": {
-                            "$ref": "#/definitions/internal_api.ListMasterLogsResponse"
+                            "$ref": "#/definitions/internal_api.ListLogsResponse"
                         }
                     },
                     "500": {
@@ -991,7 +991,7 @@ const docTemplate = `{
                         "AdminAuth": []
                     }
                 ],
-                "description": "Aggregate log stats with basic filtering",
+                "description": "Aggregate log stats with basic filtering. Use group_by param for grouped statistics (model/day/month). Without group_by returns LogStatsResponse; with group_by returns GroupedStatsResponse.",
                 "produces": [
                     "application/json"
                 ],
@@ -1011,13 +1011,24 @@ const docTemplate = `{
                         "description": "unix seconds",
                         "name": "until",
                         "in": "query"
+                    },
+                    {
+                        "enum": [
+                            "model",
+                            "day",
+                            "month"
+                        ],
+                        "type": "string",
+                        "description": "group by dimension: model, day, month. Returns GroupedStatsResponse when specified.",
+                        "name": "group_by",
+                        "in": "query"
                     }
                 ],
                 "responses": {
                     "200": {
-                        "description": "OK",
+                        "description": "Grouped stats (when group_by is specified)",
                         "schema": {
-                            "$ref": "#/definitions/internal_api.LogStatsResponse"
+                            "$ref": "#/definitions/internal_api.GroupedStatsResponse"
                         }
                     },
                     "500": {
@@ -4175,6 +4186,46 @@ const docTemplate = `{
                 }
             }
         },
+        "internal_api.GroupedStatsItem": {
+            "type": "object",
+            "properties": {
+                "avg_latency_ms": {
+                    "type": "number"
+                },
+                "count": {
+                    "type": "integer"
+                },
+                "date": {
+                    "description": "For group_by=day",
+                    "type": "string"
+                },
+                "model": {
+                    "description": "For group_by=model",
+                    "type": "string"
+                },
+                "month": {
+                    "description": "For group_by=month",
+                    "type": "string"
+                },
+                "tokens_in": {
+                    "type": "integer"
+                },
+                "tokens_out": {
+                    "type": "integer"
+                }
+            }
+        },
+        "internal_api.GroupedStatsResponse": {
+            "type": "object",
+            "properties": {
+                "items": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/internal_api.GroupedStatsItem"
+                    }
+                }
+            }
+        },
         "internal_api.IssueChildKeyRequest": {
             "type": "object",
             "properties": {
@@ -4215,6 +4266,26 @@ const docTemplate = `{
                 }
             }
         },
+        "internal_api.ListLogsResponse": {
+            "type": "object",
+            "properties": {
+                "items": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/internal_api.LogView"
+                    }
+                },
+                "limit": {
+                    "type": "integer"
+                },
+                "offset": {
+                    "type": "integer"
+                },
+                "total": {
+                    "type": "integer"
+                }
+            }
+        },
         "internal_api.ListMasterLogsResponse": {
             "type": "object",
             "properties": {
@@ -4259,6 +4330,65 @@ const docTemplate = `{
                 }
             }
         },
+        "internal_api.LogView": {
+            "type": "object",
+            "properties": {
+                "audit_reason": {
+                    "type": "string"
+                },
+                "client_ip": {
+                    "type": "string"
+                },
+                "created_at": {
+                    "type": "integer"
+                },
+                "error_message": {
+                    "type": "string"
+                },
+                "group": {
+                    "type": "string"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "key_id": {
+                    "type": "integer"
+                },
+                "latency_ms": {
+                    "type": "integer"
+                },
+                "model": {
+                    "type": "string"
+                },
+                "provider_id": {
+                    "type": "integer"
+                },
+                "provider_name": {
+                    "type": "string"
+                },
+                "provider_type": {
+                    "type": "string"
+                },
+                "request_body": {
+                    "type": "string"
+                },
+                "request_size": {
+                    "type": "integer"
+                },
+                "response_size": {
+                    "type": "integer"
+                },
+                "status_code": {
+                    "type": "integer"
+                },
+                "tokens_in": {
+                    "type": "integer"
+                },
+                "tokens_out": {
+                    "type": "integer"
+                }
+            }
+        },
         "internal_api.ManageMasterRequest": {
             "type": "object",
             "required": [
diff --git a/docs/swagger.json b/docs/swagger.json
index cda71cc..66f8bc5 100644
--- a/docs/swagger.json
+++ b/docs/swagger.json
@@ -855,7 +855,7 @@
                         "AdminAuth": []
                     }
                 ],
-                "description": "List request logs with basic filtering/pagination",
+                "description": "List request logs with basic filtering/pagination. Returns full log records including request_body.",
                 "produces": [
                     "application/json"
                 ],
@@ -917,7 +917,7 @@
                     "200": {
                         "description": "OK",
                         "schema": {
-                            "$ref": "#/definitions/internal_api.ListMasterLogsResponse"
+                            "$ref": "#/definitions/internal_api.ListLogsResponse"
                         }
                     },
                     "500": {
@@ -985,7 +985,7 @@
                         "AdminAuth": []
                     }
                 ],
-                "description": "Aggregate log stats with basic filtering",
+                "description": "Aggregate log stats with basic filtering. Use group_by param for grouped statistics (model/day/month). Without group_by returns LogStatsResponse; with group_by returns GroupedStatsResponse.",
                 "produces": [
                     "application/json"
                 ],
@@ -1005,13 +1005,24 @@
                         "description": "unix seconds",
                         "name": "until",
                         "in": "query"
+                    },
+                    {
+                        "enum": [
+                            "model",
+                            "day",
+                            "month"
+                        ],
+                        "type": "string",
+                        "description": "group by dimension: model, day, month. Returns GroupedStatsResponse when specified.",
+                        "name": "group_by",
+                        "in": "query"
                     }
                 ],
                 "responses": {
                     "200": {
-                        "description": "OK",
+                        "description": "Grouped stats (when group_by is specified)",
                         "schema": {
-                            "$ref": "#/definitions/internal_api.LogStatsResponse"
+                            "$ref": "#/definitions/internal_api.GroupedStatsResponse"
                         }
                     },
                     "500": {
@@ -4169,6 +4180,46 @@
                 }
             }
         },
+        "internal_api.GroupedStatsItem": {
+            "type": "object",
+            "properties": {
+                "avg_latency_ms": {
+                    "type": "number"
+                },
+                "count": {
+                    "type": "integer"
+                },
+                "date": {
+                    "description": "For group_by=day",
+                    "type": "string"
+                },
+                "model": {
+                    "description": "For group_by=model",
+                    "type": "string"
+                },
+                "month": {
+                    "description": "For group_by=month",
+                    "type": "string"
+                },
+                "tokens_in": {
+                    "type": "integer"
+                },
+                "tokens_out": {
+                    "type": "integer"
+                }
+            }
+        },
+        "internal_api.GroupedStatsResponse": {
+            "type": "object",
+            "properties": {
+                "items": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/internal_api.GroupedStatsItem"
+                    }
+                }
+            }
+        },
         "internal_api.IssueChildKeyRequest": {
             "type": "object",
             "properties": {
@@ -4209,6 +4260,26 @@
                 }
             }
         },
+        "internal_api.ListLogsResponse": {
+            "type": "object",
+            "properties": {
+                "items": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/internal_api.LogView"
+                    }
+                },
+                "limit": {
+                    "type": "integer"
+                },
+                "offset": {
+                    "type": "integer"
+                },
+                "total": {
+                    "type": "integer"
+                }
+            }
+        },
         "internal_api.ListMasterLogsResponse": {
             "type": "object",
             "properties": {
@@ -4253,6 +4324,65 @@
                 }
             }
         },
+        "internal_api.LogView": {
+            "type": "object",
+            "properties": {
+                "audit_reason": {
+                    "type": "string"
+                },
+                "client_ip": {
+                    "type": "string"
+                },
+                "created_at": {
+                    "type": "integer"
+                },
+                "error_message": {
+                    "type": "string"
+                },
+                "group": {
+                    "type": "string"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "key_id": {
+                    "type": "integer"
+                },
+                "latency_ms": {
+                    "type": "integer"
+                },
+                "model": {
+                    "type": "string"
+                },
+                "provider_id": {
+                    "type": "integer"
+                },
+                "provider_name": {
+                    "type": "string"
+                },
+                "provider_type": {
+                    "type": "string"
+                },
+                "request_body": {
+                    "type": "string"
+                },
+                "request_size": {
+                    "type": "integer"
+                },
+                "response_size": {
+                    "type": "integer"
+                },
+                "status_code": {
+                    "type": "integer"
+                },
+                "tokens_in": {
+                    "type": "integer"
+                },
+                "tokens_out": {
+                    "type": "integer"
+                }
+            }
+        },
         "internal_api.ManageMasterRequest": {
             "type": "object",
             "required": [
diff --git a/docs/swagger.yaml b/docs/swagger.yaml
index 1078e4a..d21f473 100644
--- a/docs/swagger.yaml
+++ b/docs/swagger.yaml
@@ -417,6 +417,33 @@ definitions:
       deleted_count:
         type: integer
     type: object
+  internal_api.GroupedStatsItem:
+    properties:
+      avg_latency_ms:
+        type: number
+      count:
+        type: integer
+      date:
+        description: For group_by=day
+        type: string
+      model:
+        description: For group_by=model
+        type: string
+      month:
+        description: For group_by=month
+        type: string
+      tokens_in:
+        type: integer
+      tokens_out:
+        type: integer
+    type: object
+  internal_api.GroupedStatsResponse:
+    properties:
+      items:
+        items:
+          $ref: '#/definitions/internal_api.GroupedStatsItem'
+        type: array
+    type: object
   internal_api.IssueChildKeyRequest:
     properties:
       allow_ips:
@@ -443,6 +470,19 @@ definitions:
       tokens:
         type: integer
     type: object
+  internal_api.ListLogsResponse:
+    properties:
+      items:
+        items:
+          $ref: '#/definitions/internal_api.LogView'
+        type: array
+      limit:
+        type: integer
+      offset:
+        type: integer
+      total:
+        type: integer
+    type: object
   internal_api.ListMasterLogsResponse:
     properties:
       items:
@@ -472,6 +512,45 @@ definitions:
       total:
         type: integer
     type: object
+  internal_api.LogView:
+    properties:
+      audit_reason:
+        type: string
+      client_ip:
+        type: string
+      created_at:
+        type: integer
+      error_message:
+        type: string
+      group:
+        type: string
+      id:
+        type: integer
+      key_id:
+        type: integer
+      latency_ms:
+        type: integer
+      model:
+        type: string
+      provider_id:
+        type: integer
+      provider_name:
+        type: string
+      provider_type:
+        type: string
+      request_body:
+        type: string
+      request_size:
+        type: integer
+      response_size:
+        type: integer
+      status_code:
+        type: integer
+      tokens_in:
+        type: integer
+      tokens_out:
+        type: integer
+    type: object
   internal_api.ManageMasterRequest:
     properties:
       action:
@@ -1426,7 +1505,8 @@ paths:
       tags:
       - admin
     get:
-      description: List request logs with basic filtering/pagination
+      description: List request logs with basic filtering/pagination. Returns full
+        log records including request_body.
       parameters:
       - description: limit (default 50, max 200)
         in: query
@@ -1466,7 +1546,7 @@ paths:
         "200":
           description: OK
           schema:
-            $ref: '#/definitions/internal_api.ListMasterLogsResponse'
+            $ref: '#/definitions/internal_api.ListLogsResponse'
         "500":
           description: Internal Server Error
           schema:
@@ -1478,7 +1558,9 @@ paths:
       - admin
   /admin/logs/stats:
     get:
-      description: Aggregate log stats with basic filtering
+      description: Aggregate log stats with basic filtering. Use group_by param for
+        grouped statistics (model/day/month). Without group_by returns LogStatsResponse;
+        with group_by returns GroupedStatsResponse.
       parameters:
       - description: unix seconds
         in: query
@@ -1488,13 +1570,22 @@ paths:
         in: query
         name: until
         type: integer
+      - description: 'group by dimension: model, day, month. Returns GroupedStatsResponse
+          when specified.'
+        enum:
+        - model
+        - day
+        - month
+        in: query
+        name: group_by
+        type: string
       produces:
       - application/json
       responses:
         "200":
-          description: OK
+          description: Grouped stats (when group_by is specified)
           schema:
-            $ref: '#/definitions/internal_api.LogStatsResponse'
+            $ref: '#/definitions/internal_api.GroupedStatsResponse'
         "500":
           description: Internal Server Error
           schema:
diff --git a/internal/api/log_handler.go b/internal/api/log_handler.go
index 6a4bba8..8fb0d29 100644
--- a/internal/api/log_handler.go
+++ b/internal/api/log_handler.go
@@ -155,7 +155,7 @@ func (h *MasterHandler) masterLogBase(masterID uint) (*gorm.DB, error) {
 
 // ListLogs godoc
 // @Summary      List logs (admin)
-// @Description  List request logs with basic filtering/pagination
+// @Description  List request logs with basic filtering/pagination. Returns full log records including request_body.
 // @Tags         admin
 // @Produce      json
 // @Security     AdminAuth
@@ -167,7 +167,7 @@ func (h *MasterHandler) masterLogBase(masterID uint) (*gorm.DB, error) {
 // @Param        group        query     string  false  "route group"
 // @Param        model        query     string  false  "model"
 // @Param        status_code  query     int     false  "status code"
-// @Success      200  {object}  ListMasterLogsResponse
+// @Success      200  {object}  ListLogsResponse
 // @Failure      500  {object}  gin.H
 // @Router       /admin/logs [get]
 func (h *Handler) ListLogs(c *gin.Context) {
@@ -346,14 +346,15 @@ func (h *Handler) deleteLogsBefore(cutoff time.Time, keyID uint, modelName strin
 
 // LogStats godoc
 // @Summary      Log stats (admin)
-// @Description  Aggregate log stats with basic filtering. Use group_by param for grouped statistics.
+// @Description  Aggregate log stats with basic filtering. Use group_by param for grouped statistics (model/day/month). Without group_by returns LogStatsResponse; with group_by returns GroupedStatsResponse.
 // @Tags         admin
 // @Produce      json
 // @Security     AdminAuth
 // @Param        since    query     int     false  "unix seconds"
 // @Param        until    query     int     false  "unix seconds"
-// @Param        group_by query     string  false  "group by dimension: model, day, month"
-// @Success      200  {object}  LogStatsResponse
+// @Param        group_by query     string  false  "group by dimension: model, day, month. Returns GroupedStatsResponse when specified."  Enums(model, day, month)
+// @Success      200  {object}  LogStatsResponse  "Default aggregated stats (when group_by is not specified)"
+// @Success      200  {object}  GroupedStatsResponse  "Grouped stats (when group_by is specified)"
 // @Failure      500  {object}  gin.H
 // @Router       /admin/logs/stats [get]
 func (h *Handler) LogStats(c *gin.Context) {