feat: replace gemini-3-pro-image with gemini-3.1-flash-image

- Add migration 060 to update model_mapping for all antigravity accounts
- Remove gemini-3-pro-image and gemini-3-pro-image-preview mappings
- Add gemini-3.1-flash-image and gemini-3.1-flash-image-preview mappings
- Update frontend usage window to show GImage for new model
- Update isImageGenerationModel to support new model

backend/internal/domain/constants.go

@@ -92,16 +92,18 @@ var DefaultAntigravityModelMapping = map[string]string{
 	"gemini-3-flash":     "gemini-3-flash",
 	"gemini-3-pro-high":  "gemini-3-pro-high",
 	"gemini-3-pro-low":   "gemini-3-pro-low",
-	"gemini-3-pro-image": "gemini-3-pro-image",
 	// Gemini 3 preview 映射
 	"gemini-3-flash-preview":     "gemini-3-flash",
 	"gemini-3-pro-preview":       "gemini-3-pro-high",
-	"gemini-3-pro-image-preview": "gemini-3-pro-image",
 	// Gemini 3.1 白名单
 	"gemini-3.1-pro-high": "gemini-3.1-pro-high",
 	"gemini-3.1-pro-low":  "gemini-3.1-pro-low",
 	// Gemini 3.1 preview 映射
 	"gemini-3.1-pro-preview": "gemini-3.1-pro-high",
+	// Gemini 3.1 image 白名单
+	"gemini-3.1-flash-image": "gemini-3.1-flash-image",
+	// Gemini 3.1 image preview 映射
+	"gemini-3.1-flash-image-preview": "gemini-3.1-flash-image",
 	// 其他官方模型
 	"gpt-oss-120b-medium":    "gpt-oss-120b-medium",
 	"tab_flash_lite_preview": "tab_flash_lite_preview",

backend/internal/service/antigravity_gateway_service.go

@@ -3757,14 +3757,17 @@ func (s *AntigravityGatewayService) extractImageSize(body []byte) string {
 }
 
 // isImageGenerationModel 判断模型是否为图片生成模型
-// 支持的模型：gemini-3-pro-image, gemini-3-pro-image-preview, gemini-2.5-flash-image 等
+// 支持的模型：gemini-3.1-flash-image, gemini-3-pro-image, gemini-2.5-flash-image 等
 func isImageGenerationModel(model string) bool {
 	modelLower := strings.ToLower(model)
 	// 移除 models/ 前缀
 	modelLower = strings.TrimPrefix(modelLower, "models/")
 
 	// 精确匹配或前缀匹配
-	return modelLower == "gemini-3-pro-image" ||
+	return modelLower == "gemini-3.1-flash-image" ||
+		modelLower == "gemini-3.1-flash-image-preview" ||
+		strings.HasPrefix(modelLower, "gemini-3.1-flash-image-") ||
+		modelLower == "gemini-3-pro-image" ||
 		modelLower == "gemini-3-pro-image-preview" ||
 		strings.HasPrefix(modelLower, "gemini-3-pro-image-") ||
 		modelLower == "gemini-2.5-flash-image" ||

backend/internal/service/gateway_service.go

@@ -470,7 +470,7 @@ type ForwardResult struct {
 	FirstTokenMs     *int // 首字时间（流式请求）
 	ClientDisconnect bool // 客户端是否在流式传输过程中断开
 
-	// 图片生成计费字段（仅 gemini-3-pro-image 使用）
+	// 图片生成计费字段（图片生成模型使用）
 	ImageCount int    // 生成的图片数量
 	ImageSize  string // 图片尺寸 "1K", "2K", "4K"
 

backend/migrations/060_add_gemini31_flash_image_to_model_mapping.sql

@@ -0,0 +1,46 @@
+-- Add gemini-3.1-flash-image and gemini-3.1-flash-image-preview to model_mapping
+--
+-- Background:
+-- Antigravity now supports gemini-3.1-flash-image as the latest image generation model,
+-- replacing the previous gemini-3-pro-image.
+--
+-- Strategy:
+-- Directly overwrite the entire model_mapping with updated mappings
+-- This ensures consistency with DefaultAntigravityModelMapping in constants.go
+
+UPDATE accounts
+SET credentials = jsonb_set(
+    credentials,
+    '{model_mapping}',
+    '{
+        "claude-opus-4-6-thinking": "claude-opus-4-6-thinking",
+        "claude-opus-4-6": "claude-opus-4-6-thinking",
+        "claude-opus-4-5-thinking": "claude-opus-4-6-thinking",
+        "claude-opus-4-5-20251101": "claude-opus-4-6-thinking",
+        "claude-sonnet-4-6": "claude-sonnet-4-6",
+        "claude-sonnet-4-5": "claude-sonnet-4-5",
+        "claude-sonnet-4-5-thinking": "claude-sonnet-4-5-thinking",
+        "claude-sonnet-4-5-20250929": "claude-sonnet-4-5",
+        "claude-haiku-4-5": "claude-sonnet-4-5",
+        "claude-haiku-4-5-20251001": "claude-sonnet-4-5",
+        "gemini-2.5-flash": "gemini-2.5-flash",
+        "gemini-2.5-flash-lite": "gemini-2.5-flash-lite",
+        "gemini-2.5-flash-thinking": "gemini-2.5-flash-thinking",
+        "gemini-2.5-pro": "gemini-2.5-pro",
+        "gemini-3-flash": "gemini-3-flash",
+        "gemini-3-pro-high": "gemini-3-pro-high",
+        "gemini-3-pro-low": "gemini-3-pro-low",
+        "gemini-3-flash-preview": "gemini-3-flash",
+        "gemini-3-pro-preview": "gemini-3-pro-high",
+        "gemini-3.1-pro-high": "gemini-3.1-pro-high",
+        "gemini-3.1-pro-low": "gemini-3.1-pro-low",
+        "gemini-3.1-pro-preview": "gemini-3.1-pro-high",
+        "gemini-3.1-flash-image": "gemini-3.1-flash-image",
+        "gemini-3.1-flash-image-preview": "gemini-3.1-flash-image",
+        "gpt-oss-120b-medium": "gpt-oss-120b-medium",
+        "tab_flash_lite_preview": "tab_flash_lite_preview"
+    }'::jsonb
+)
+WHERE platform = 'antigravity'
+  AND deleted_at IS NULL
+  AND credentials->'model_mapping' IS NOT NULL;

frontend/src/components/account/AccountStatusIndicator.vue

@@ -181,6 +181,7 @@ const formatScopeName = (scope: string): string => {
     'gemini-3.1-pro-high': 'G3PH',
     'gemini-3.1-pro-low': 'G3PL',
     'gemini-3-pro-image': 'G3PI',
+    'gemini-3.1-flash-image': 'GImage',
     // 其他
     'gpt-oss-120b-medium': 'GPT120',
     'tab_flash_lite_preview': 'TabFL',

frontend/src/components/account/AccountUsageCell.vue

@@ -397,8 +397,8 @@ const antigravity3ProUsageFromAPI = computed(() =>
 // Gemini 3 Flash from API
 const antigravity3FlashUsageFromAPI = computed(() => getAntigravityUsageFromAPI(['gemini-3-flash']))
 
-// Gemini 3 Image from API
+// Gemini Image from API
-const antigravity3ImageUsageFromAPI = computed(() => getAntigravityUsageFromAPI(['gemini-3-pro-image']))
+const antigravity3ImageUsageFromAPI = computed(() => getAntigravityUsageFromAPI(['gemini-3.1-flash-image']))
 
 // Claude from API (all Claude model variants)
 const antigravityClaudeUsageFromAPI = computed(() =>

frontend/src/components/keys/UseKeyModal.vue

@@ -864,8 +864,8 @@ function generateOpenCodeConfig(platform: string, baseUrl: string, apiKey: strin
         }
       }
     },
-    'gemini-3-pro-image': {
+    'gemini-3.1-flash-image': {
-      name: 'Gemini 3 Pro (Image)',
+      name: 'Gemini 3.1 Flash Image',
       limit: {
         context: 1048576,
         output: 65536

frontend/src/composables/useModelWhitelist.ts

@@ -91,10 +91,10 @@ const antigravityModels = [
   'gemini-3-flash',
   'gemini-3-pro-high',
   'gemini-3-pro-low',
-  'gemini-3-pro-image',
   // Gemini 3.1 系列
   'gemini-3.1-pro-high',
   'gemini-3.1-pro-low',
+  'gemini-3.1-flash-image',
   // 其他
   'gpt-oss-120b-medium',
   'tab_flash_lite_preview'

frontend/src/i18n/locales/en.ts

@@ -1133,7 +1133,7 @@ export default {
       },
       imagePricing: {
         title: 'Image Generation Pricing',
-        description: 'Configure pricing for gemini-3-pro-image model. Leave empty to use default prices.'
+        description: 'Configure pricing for image generation models. Leave empty to use default prices.'
       },
       soraPricing: {
         title: 'Sora Per-Request Pricing',
@@ -2047,7 +2047,7 @@ export default {
         geminiFlashDaily: 'Flash',
         gemini3Pro: 'G3P',
         gemini3Flash: 'G3F',
-        gemini3Image: 'G3I',
+        gemini3Image: 'GImage',
         claude: 'Claude'
       },
       tier: {

frontend/src/i18n/locales/zh.ts

@@ -1220,7 +1220,7 @@ export default {
       },
       imagePricing: {
         title: '图片生成计费',
-        description: '配置 gemini-3-pro-image 模型的图片生成价格，留空则使用默认价格'
+        description: '配置图片生成模型的图片生成价格，留空则使用默认价格'
       },
       soraPricing: {
         title: 'Sora 按次计费',
@@ -1582,7 +1582,7 @@ export default {
         geminiFlashDaily: 'Flash',
         gemini3Pro: 'G3P',
         gemini3Flash: 'G3F',
-        gemini3Image: 'G3I',
+        gemini3Image: 'GImage',
         claude: 'Claude'
       },
       tier: {