feat(openai): 增加 gpt-5.4-mini/nano 模型支持与定价配置

- 接入 gpt-5.4-mini/nano 模型识别与规范化，补充默认模型列表
- 增加 gpt-5.4-mini/nano 输入/缓存命中/输出价格与计费兜底逻辑
- 同步前端模型白名单与 OpenCode 配置
- 补充 service tier(priority/flex) 计费回归测试

backend/internal/pkg/openai/constants.go

@@ -16,6 +16,8 @@ type Model struct {
 // DefaultModels OpenAI models list
 var DefaultModels = []Model{
 	{ID: "gpt-5.4", Object: "model", Created: 1738368000, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.4"},
+	{ID: "gpt-5.4-mini", Object: "model", Created: 1738368000, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.4 Mini"},
+	{ID: "gpt-5.4-nano", Object: "model", Created: 1738368000, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.4 Nano"},
 	{ID: "gpt-5.3-codex", Object: "model", Created: 1735689600, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.3 Codex"},
 	{ID: "gpt-5.3-codex-spark", Object: "model", Created: 1735689600, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.3 Codex Spark"},
 	{ID: "gpt-5.2", Object: "model", Created: 1733875200, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.2"},

backend/internal/service/billing_service.go

@@ -221,6 +221,18 @@ func (s *BillingService) initFallbackPricing() {
 		LongContextInputMultiplier:     openAIGPT54LongContextInputMultiplier,
 		LongContextOutputMultiplier:    openAIGPT54LongContextOutputMultiplier,
 	}
+	s.fallbackPrices["gpt-5.4-mini"] = &ModelPricing{
+		InputPricePerToken:             7.5e-7,
+		OutputPricePerToken:            4.5e-6,
+		CacheReadPricePerToken:         7.5e-8,
+		SupportsCacheBreakdown:         false,
+	}
+	s.fallbackPrices["gpt-5.4-nano"] = &ModelPricing{
+		InputPricePerToken:     2e-7,
+		OutputPricePerToken:    1.25e-6,
+		CacheReadPricePerToken: 2e-8,
+		SupportsCacheBreakdown: false,
+	}
 	// OpenAI GPT-5.2（本地兜底）
 	s.fallbackPrices["gpt-5.2"] = &ModelPricing{
 		InputPricePerToken:             1.75e-6,
@@ -294,6 +306,10 @@ func (s *BillingService) getFallbackPricing(model string) *ModelPricing {
 	if strings.Contains(modelLower, "gpt-5") || strings.Contains(modelLower, "codex") {
 		normalized := normalizeCodexModel(modelLower)
 		switch normalized {
+		case "gpt-5.4-mini":
+			return s.fallbackPrices["gpt-5.4-mini"]
+		case "gpt-5.4-nano":
+			return s.fallbackPrices["gpt-5.4-nano"]
 		case "gpt-5.4":
 			return s.fallbackPrices["gpt-5.4"]
 		case "gpt-5.2":

backend/internal/service/billing_service_test.go

@@ -174,6 +174,30 @@ func TestGetModelPricing_OpenAIGPT54Fallback(t *testing.T) {
 	require.InDelta(t, 1.5, pricing.LongContextOutputMultiplier, 1e-12)
 }
 
+func TestGetModelPricing_OpenAIGPT54MiniFallback(t *testing.T) {
+	svc := newTestBillingService()
+
+	pricing, err := svc.GetModelPricing("gpt-5.4-mini")
+	require.NoError(t, err)
+	require.NotNil(t, pricing)
+	require.InDelta(t, 7.5e-7, pricing.InputPricePerToken, 1e-12)
+	require.InDelta(t, 4.5e-6, pricing.OutputPricePerToken, 1e-12)
+	require.InDelta(t, 7.5e-8, pricing.CacheReadPricePerToken, 1e-12)
+	require.Zero(t, pricing.LongContextInputThreshold)
+}
+
+func TestGetModelPricing_OpenAIGPT54NanoFallback(t *testing.T) {
+	svc := newTestBillingService()
+
+	pricing, err := svc.GetModelPricing("gpt-5.4-nano")
+	require.NoError(t, err)
+	require.NotNil(t, pricing)
+	require.InDelta(t, 2e-7, pricing.InputPricePerToken, 1e-12)
+	require.InDelta(t, 1.25e-6, pricing.OutputPricePerToken, 1e-12)
+	require.InDelta(t, 2e-8, pricing.CacheReadPricePerToken, 1e-12)
+	require.Zero(t, pricing.LongContextInputThreshold)
+}
+
 func TestCalculateCost_OpenAIGPT54LongContextAppliesWholeSessionMultipliers(t *testing.T) {
 	svc := newTestBillingService()
 
@@ -210,6 +234,8 @@ func TestGetFallbackPricing_FamilyMatching(t *testing.T) {
 		{name: "gemini unknown no fallback", model: "gemini-2.0-pro", expectNilPricing: true},
 		{name: "openai gpt5.1", model: "gpt-5.1", expectedInput: 1.25e-6},
 		{name: "openai gpt5.4", model: "gpt-5.4", expectedInput: 2.5e-6},
+		{name: "openai gpt5.4 mini", model: "gpt-5.4-mini", expectedInput: 7.5e-7},
+		{name: "openai gpt5.4 nano", model: "gpt-5.4-nano", expectedInput: 2e-7},
 		{name: "openai gpt5.3 codex", model: "gpt-5.3-codex", expectedInput: 1.5e-6},
 		{name: "openai gpt5.1 codex max alias", model: "gpt-5.1-codex-max", expectedInput: 1.5e-6},
 		{name: "openai codex mini latest alias", model: "codex-mini-latest", expectedInput: 1.5e-6},
@@ -564,6 +590,40 @@ func TestCalculateCostWithServiceTier_FlexAppliesHalfMultiplier(t *testing.T) {
 	require.InDelta(t, baseCost.TotalCost*0.5, flexCost.TotalCost, 1e-10)
 }
 
+func TestCalculateCostWithServiceTier_Gpt54MiniPriorityFallsBackToTierMultiplier(t *testing.T) {
+	svc := newTestBillingService()
+	tokens := UsageTokens{InputTokens: 120, OutputTokens: 30, CacheCreationTokens: 12, CacheReadTokens: 8}
+
+	baseCost, err := svc.CalculateCost("gpt-5.4-mini", tokens, 1.0)
+	require.NoError(t, err)
+
+	priorityCost, err := svc.CalculateCostWithServiceTier("gpt-5.4-mini", tokens, 1.0, "priority")
+	require.NoError(t, err)
+
+	require.InDelta(t, baseCost.InputCost*2, priorityCost.InputCost, 1e-10)
+	require.InDelta(t, baseCost.OutputCost*2, priorityCost.OutputCost, 1e-10)
+	require.InDelta(t, baseCost.CacheCreationCost*2, priorityCost.CacheCreationCost, 1e-10)
+	require.InDelta(t, baseCost.CacheReadCost*2, priorityCost.CacheReadCost, 1e-10)
+	require.InDelta(t, baseCost.TotalCost*2, priorityCost.TotalCost, 1e-10)
+}
+
+func TestCalculateCostWithServiceTier_Gpt54NanoFlexAppliesHalfMultiplier(t *testing.T) {
+	svc := newTestBillingService()
+	tokens := UsageTokens{InputTokens: 100, OutputTokens: 50, CacheCreationTokens: 40, CacheReadTokens: 20}
+
+	baseCost, err := svc.CalculateCost("gpt-5.4-nano", tokens, 1.0)
+	require.NoError(t, err)
+
+	flexCost, err := svc.CalculateCostWithServiceTier("gpt-5.4-nano", tokens, 1.0, "flex")
+	require.NoError(t, err)
+
+	require.InDelta(t, baseCost.InputCost*0.5, flexCost.InputCost, 1e-10)
+	require.InDelta(t, baseCost.OutputCost*0.5, flexCost.OutputCost, 1e-10)
+	require.InDelta(t, baseCost.CacheCreationCost*0.5, flexCost.CacheCreationCost, 1e-10)
+	require.InDelta(t, baseCost.CacheReadCost*0.5, flexCost.CacheReadCost, 1e-10)
+	require.InDelta(t, baseCost.TotalCost*0.5, flexCost.TotalCost, 1e-10)
+}
+
 func TestCalculateCostWithServiceTier_PriorityFallsBackToTierMultiplierWithoutExplicitPriorityPrice(t *testing.T) {
 	svc := newTestBillingService()
 	tokens := UsageTokens{InputTokens: 120, OutputTokens: 30, CacheCreationTokens: 12, CacheReadTokens: 8}

backend/internal/service/openai_codex_transform.go

@@ -7,6 +7,8 @@ import (
 
 var codexModelMap = map[string]string{
 	"gpt-5.4":                    "gpt-5.4",
+	"gpt-5.4-mini":               "gpt-5.4-mini",
+	"gpt-5.4-nano":               "gpt-5.4-nano",
 	"gpt-5.4-none":               "gpt-5.4",
 	"gpt-5.4-low":                "gpt-5.4",
 	"gpt-5.4-medium":             "gpt-5.4",
@@ -225,6 +227,12 @@ func normalizeCodexModel(model string) string {
 
 	normalized := strings.ToLower(modelID)
 
+	if strings.Contains(normalized, "gpt-5.4-mini") || strings.Contains(normalized, "gpt 5.4 mini") {
+		return "gpt-5.4-mini"
+	}
+	if strings.Contains(normalized, "gpt-5.4-nano") || strings.Contains(normalized, "gpt 5.4 nano") {
+		return "gpt-5.4-nano"
+	}
 	if strings.Contains(normalized, "gpt-5.4") || strings.Contains(normalized, "gpt 5.4") {
 		return "gpt-5.4"
 	}

backend/internal/service/openai_codex_transform_test.go

@@ -238,6 +238,10 @@ func TestNormalizeCodexModel_Gpt53(t *testing.T) {
 		"gpt-5.4-high":              "gpt-5.4",
 		"gpt-5.4-chat-latest":       "gpt-5.4",
 		"gpt 5.4":                   "gpt-5.4",
+		"gpt-5.4-mini":              "gpt-5.4-mini",
+		"gpt 5.4 mini":              "gpt-5.4-mini",
+		"gpt-5.4-nano":              "gpt-5.4-nano",
+		"gpt 5.4 nano":              "gpt-5.4-nano",
 		"gpt-5.3":                   "gpt-5.3-codex",
 		"gpt-5.3-codex":             "gpt-5.3-codex",
 		"gpt-5.3-codex-xhigh":       "gpt-5.3-codex",

backend/internal/service/pricing_service.go

@@ -34,6 +34,22 @@ var (
 		Mode:                            "chat",
 		SupportsPromptCaching:           true,
 	}
+	openAIGPT54MiniFallbackPricing = &LiteLLMModelPricing{
+		InputCostPerToken:       7.5e-07,
+		OutputCostPerToken:      4.5e-06,
+		CacheReadInputTokenCost: 7.5e-08,
+		LiteLLMProvider:         "openai",
+		Mode:                    "chat",
+		SupportsPromptCaching:   true,
+	}
+	openAIGPT54NanoFallbackPricing = &LiteLLMModelPricing{
+		InputCostPerToken:       2e-07,
+		OutputCostPerToken:      1.25e-06,
+		CacheReadInputTokenCost: 2e-08,
+		LiteLLMProvider:         "openai",
+		Mode:                    "chat",
+		SupportsPromptCaching:   true,
+	}
 )
 
 // LiteLLMModelPricing LiteLLM价格数据结构
@@ -723,6 +739,18 @@ func (s *PricingService) matchOpenAIModel(model string) *LiteLLMModelPricing {
 		}
 	}
 
+	if strings.HasPrefix(model, "gpt-5.4-mini") {
+		logger.With(zap.String("component", "service.pricing")).
+			Info(fmt.Sprintf("[Pricing] OpenAI fallback matched %s -> %s", model, "gpt-5.4-mini(static)"))
+		return openAIGPT54MiniFallbackPricing
+	}
+
+	if strings.HasPrefix(model, "gpt-5.4-nano") {
+		logger.With(zap.String("component", "service.pricing")).
+			Info(fmt.Sprintf("[Pricing] OpenAI fallback matched %s -> %s", model, "gpt-5.4-nano(static)"))
+		return openAIGPT54NanoFallbackPricing
+	}
+
 	if strings.HasPrefix(model, "gpt-5.4") {
 		logger.With(zap.String("component", "service.pricing")).
 			Info(fmt.Sprintf("[Pricing] OpenAI fallback matched %s -> %s", model, "gpt-5.4(static)"))

backend/internal/service/pricing_service_test.go

@@ -98,6 +98,36 @@ func TestGetModelPricing_Gpt54UsesStaticFallbackWhenRemoteMissing(t *testing.T)
 	require.InDelta(t, 1.5, got.LongContextOutputCostMultiplier, 1e-12)
 }
 
+func TestGetModelPricing_Gpt54MiniUsesDedicatedStaticFallbackWhenRemoteMissing(t *testing.T) {
+	svc := &PricingService{
+		pricingData: map[string]*LiteLLMModelPricing{
+			"gpt-5.1-codex": {InputCostPerToken: 1.25e-6},
+		},
+	}
+
+	got := svc.GetModelPricing("gpt-5.4-mini")
+	require.NotNil(t, got)
+	require.InDelta(t, 7.5e-7, got.InputCostPerToken, 1e-12)
+	require.InDelta(t, 4.5e-6, got.OutputCostPerToken, 1e-12)
+	require.InDelta(t, 7.5e-8, got.CacheReadInputTokenCost, 1e-12)
+	require.Zero(t, got.LongContextInputTokenThreshold)
+}
+
+func TestGetModelPricing_Gpt54NanoUsesDedicatedStaticFallbackWhenRemoteMissing(t *testing.T) {
+	svc := &PricingService{
+		pricingData: map[string]*LiteLLMModelPricing{
+			"gpt-5.1-codex": {InputCostPerToken: 1.25e-6},
+		},
+	}
+
+	got := svc.GetModelPricing("gpt-5.4-nano")
+	require.NotNil(t, got)
+	require.InDelta(t, 2e-7, got.InputCostPerToken, 1e-12)
+	require.InDelta(t, 1.25e-6, got.OutputCostPerToken, 1e-12)
+	require.InDelta(t, 2e-8, got.CacheReadInputTokenCost, 1e-12)
+	require.Zero(t, got.LongContextInputTokenThreshold)
+}
+
 func TestParsePricingData_PreservesPriorityAndServiceTierFields(t *testing.T) {
 	raw := map[string]any{
 		"gpt-5.4": map[string]any{

backend/resources/model-pricing/model_prices_and_context_window.json

@@ -5173,6 +5173,71 @@
     "supports_tool_choice": true,
     "supports_vision": true
   },
+  "gpt-5.4-mini": {
+    "cache_read_input_token_cost": 7.5e-08,
+    "input_cost_per_token": 7.5e-07,
+    "litellm_provider": "openai",
+    "max_input_tokens": 400000,
+    "max_output_tokens": 128000,
+    "max_tokens": 128000,
+    "mode": "chat",
+    "output_cost_per_token": 4.5e-06,
+    "supported_endpoints": [
+      "/v1/chat/completions",
+      "/v1/batch",
+      "/v1/responses"
+    ],
+    "supported_modalities": [
+      "text",
+      "image"
+    ],
+    "supported_output_modalities": [
+      "text"
+    ],
+    "supports_function_calling": true,
+    "supports_native_streaming": true,
+    "supports_parallel_function_calling": true,
+    "supports_pdf_input": true,
+    "supports_prompt_caching": true,
+    "supports_reasoning": true,
+    "supports_response_schema": true,
+    "supports_service_tier": true,
+    "supports_system_messages": true,
+    "supports_tool_choice": true,
+    "supports_vision": true
+  },
+  "gpt-5.4-nano": {
+    "cache_read_input_token_cost": 2e-08,
+    "input_cost_per_token": 2e-07,
+    "litellm_provider": "openai",
+    "max_input_tokens": 400000,
+    "max_output_tokens": 128000,
+    "max_tokens": 128000,
+    "mode": "chat",
+    "output_cost_per_token": 1.25e-06,
+    "supported_endpoints": [
+      "/v1/chat/completions",
+      "/v1/batch",
+      "/v1/responses"
+    ],
+    "supported_modalities": [
+      "text",
+      "image"
+    ],
+    "supported_output_modalities": [
+      "text"
+    ],
+    "supports_function_calling": true,
+    "supports_native_streaming": true,
+    "supports_parallel_function_calling": true,
+    "supports_pdf_input": true,
+    "supports_prompt_caching": true,
+    "supports_reasoning": true,
+    "supports_response_schema": true,
+    "supports_system_messages": true,
+    "supports_tool_choice": true,
+    "supports_vision": true
+  },
   "gpt-5.3-codex": {
     "cache_read_input_token_cost": 1.75e-07,
     "cache_read_input_token_cost_priority": 3.5e-07,

frontend/src/components/keys/UseKeyModal.vue

@@ -705,6 +705,38 @@ function generateOpenCodeConfig(platform: string, baseUrl: string, apiKey: strin
         xhigh: {}
       }
     },
+    'gpt-5.4-mini': {
+      name: 'GPT-5.4 Mini',
+      limit: {
+        context: 400000,
+        output: 128000
+      },
+      options: {
+        store: false
+      },
+      variants: {
+        low: {},
+        medium: {},
+        high: {},
+        xhigh: {}
+      }
+    },
+    'gpt-5.4-nano': {
+      name: 'GPT-5.4 Nano',
+      limit: {
+        context: 400000,
+        output: 128000
+      },
+      options: {
+        store: false
+      },
+      variants: {
+        low: {},
+        medium: {},
+        high: {},
+        xhigh: {}
+      }
+    },
     'gpt-5.3-codex-spark': {
       name: 'GPT-5.3 Codex Spark',
       limit: {

frontend/src/components/keys/__tests__/UseKeyModal.spec.ts

@@ -0,0 +1,53 @@
+import { describe, expect, it, vi } from 'vitest'
+import { mount } from '@vue/test-utils'
+import { nextTick } from 'vue'
+
+vi.mock('vue-i18n', () => ({
+  useI18n: () => ({
+    t: (key: string) => key
+  })
+}))
+
+vi.mock('@/composables/useClipboard', () => ({
+  useClipboard: () => ({
+    copyToClipboard: vi.fn().mockResolvedValue(true)
+  })
+}))
+
+import UseKeyModal from '../UseKeyModal.vue'
+
+describe('UseKeyModal', () => {
+  it('renders updated GPT-5.4 mini/nano names in OpenCode config', async () => {
+    const wrapper = mount(UseKeyModal, {
+      props: {
+        show: true,
+        apiKey: 'sk-test',
+        baseUrl: 'https://example.com/v1',
+        platform: 'openai'
+      },
+      global: {
+        stubs: {
+          BaseDialog: {
+            template: '<div><slot /><slot name="footer" /></div>'
+          },
+          Icon: {
+            template: '<span />'
+          }
+        }
+      }
+    })
+
+    const opencodeTab = wrapper.findAll('button').find((button) =>
+      button.text().includes('keys.useKeyModal.cliTabs.opencode')
+    )
+
+    expect(opencodeTab).toBeDefined()
+    await opencodeTab!.trigger('click')
+    await nextTick()
+
+    const codeBlock = wrapper.find('pre code')
+    expect(codeBlock.exists()).toBe(true)
+    expect(codeBlock.text()).toContain('"name": "GPT-5.4 Mini"')
+    expect(codeBlock.text()).toContain('"name": "GPT-5.4 Nano"')
+  })
+})

frontend/src/composables/__tests__/useModelWhitelist.spec.ts

@@ -11,6 +11,8 @@ describe('useModelWhitelist', () => {
     const models = getModelsByPlatform('openai')
 
     expect(models).toContain('gpt-5.4')
+    expect(models).toContain('gpt-5.4-mini')
+    expect(models).toContain('gpt-5.4-nano')
     expect(models).toContain('gpt-5.4-2026-03-05')
   })
 
@@ -52,4 +54,13 @@ describe('useModelWhitelist', () => {
       'gpt-5.4-2026-03-05': 'gpt-5.4-2026-03-05'
     })
   })
+
+  it('whitelist keeps GPT-5.4 mini and nano exact mappings', () => {
+    const mapping = buildModelMappingObject('whitelist', ['gpt-5.4-mini', 'gpt-5.4-nano'], [])
+
+    expect(mapping).toEqual({
+      'gpt-5.4-mini': 'gpt-5.4-mini',
+      'gpt-5.4-nano': 'gpt-5.4-nano'
+    })
+  })
 })

frontend/src/composables/useModelWhitelist.ts

@@ -25,7 +25,7 @@ const openaiModels = [
   'gpt-5.2', 'gpt-5.2-2025-12-11', 'gpt-5.2-chat-latest',
   'gpt-5.2-codex', 'gpt-5.2-pro', 'gpt-5.2-pro-2025-12-11',
   // GPT-5.4 系列
-  'gpt-5.4', 'gpt-5.4-2026-03-05',
+  'gpt-5.4', 'gpt-5.4-mini', 'gpt-5.4-nano', 'gpt-5.4-2026-03-05',
   // GPT-5.3 系列
   'gpt-5.3-codex', 'gpt-5.3-codex-spark',
   'chatgpt-4o-latest',