feat: 适配gpt-5-codex模型

src/routes/openaiRoutes.js

@@ -139,7 +139,7 @@ const handleResponses = async (req, res) => {
     let requestedModel = req.body?.model || null
 
     // 如果模型是 gpt-5 开头且后面还有内容（如 gpt-5-2025-08-07），则覆盖为 gpt-5
-    if (requestedModel && requestedModel.startsWith('gpt-5-') && requestedModel !== 'gpt-5') {
+    if (requestedModel && requestedModel.startsWith('gpt-5-') && requestedModel !== 'gpt-5-codex') {
       logger.info(`📝 Model ${requestedModel} detected, normalizing to gpt-5 for Codex API`)
       requestedModel = 'gpt-5'
       req.body.model = 'gpt-5' // 同时更新请求体中的模型

src/services/pricingService.js

@@ -265,6 +265,15 @@ class PricingService {
       return this.pricingData[modelName]
     }
 
+    // 特殊处理：gpt-5-codex 回退到 gpt-5
+    if (modelName === 'gpt-5-codex' && !this.pricingData['gpt-5-codex']) {
+      const fallbackPricing = this.pricingData['gpt-5']
+      if (fallbackPricing) {
+        logger.info(`💰 Using gpt-5 pricing as fallback for ${modelName}`)
+        return fallbackPricing
+      }
+    }
+
     // 对于Bedrock区域前缀模型（如 us.anthropic.claude-sonnet-4-20250514-v1:0），
     // 尝试去掉区域前缀进行匹配
     if (modelName.includes('.anthropic.') || modelName.includes('.claude')) {

src/utils/costCalculator.js

@@ -242,6 +242,14 @@ class CostCalculator {
    * @returns {Object} 定价信息
    */
   static getModelPricing(model = 'unknown') {
+    // 特殊处理：gpt-5-codex 回退到 gpt-5（如果没有专门定价）
+    if (model === 'gpt-5-codex' && !MODEL_PRICING['gpt-5-codex']) {
+      const gpt5Pricing = MODEL_PRICING['gpt-5']
+      if (gpt5Pricing) {
+        console.log(`Using gpt-5 pricing as fallback for ${model}`)
+        return gpt5Pricing
+      }
+    }
     return MODEL_PRICING[model] || MODEL_PRICING['unknown']
   }
 
@@ -285,7 +293,7 @@ class CostCalculator {
    * @returns {Object} 节省信息
    */
   static calculateCacheSavings(usage, model = 'unknown') {
-    const pricing = this.getModelPricing(model)
+    const pricing = this.getModelPricing(model) // 已包含 gpt-5-codex 回退逻辑
     const cacheReadTokens = usage.cache_read_input_tokens || 0
 
     // 如果这些token不使用缓存，需要按正常input价格计费