diff --git a/backend/internal/service/openai_gateway_response_handling.go b/backend/internal/service/openai_gateway_response_handling.go
index 436e431163..8857bdd527 100644
--- a/backend/internal/service/openai_gateway_response_handling.go
+++ b/backend/internal/service/openai_gateway_response_handling.go
@@ -1015,8 +1015,16 @@ func openAIUsageFromGJSON(value gjson.Result) (OpenAIUsage, bool) {
 	if imageOutputTokens == 0 {
 		imageOutputTokens = value.Get("completion_tokens_details.image_tokens").Int()
 	}
+	// 图片输入 token（如 gpt-image-2 的 /v1/images/edits 带图请求），
+	// 上游在 input_tokens_details.image_tokens 单独回传，用于图/文输入分价计费。
+	// 普通文本请求该字段为 0，走原路径行为不变。
+	imageInputTokens := firstPositiveGJSONInt(
+		value.Get("input_tokens_details.image_tokens"),
+		value.Get("prompt_tokens_details.image_tokens"),
+	)
 	return OpenAIUsage{
 		InputTokens:              int(inputTokens),
+		ImageInputTokens:         imageInputTokens,
 		OutputTokens:             int(outputTokens),
 		CacheCreationInputTokens: cacheCreationTokens,
 		CacheReadInputTokens:     cacheReadTokens,
diff --git a/backend/internal/service/openai_images.go b/backend/internal/service/openai_images.go
index 081b5e741b..0772830c40 100644
--- a/backend/internal/service/openai_images.go
+++ b/backend/internal/service/openai_images.go
@@ -1146,6 +1146,9 @@ func mergeOpenAIUsage(dst *OpenAIUsage, body []byte) {
 		if parsed.CacheReadInputTokens > 0 {
 			dst.CacheReadInputTokens = parsed.CacheReadInputTokens
 		}
+		if parsed.ImageInputTokens > 0 {
+			dst.ImageInputTokens = parsed.ImageInputTokens
+		}
 		if parsed.ImageOutputTokens > 0 {
 			dst.ImageOutputTokens = parsed.ImageOutputTokens
 		}