From 312f2ecb8d87579da8e1b4f3cbd223d54f39fb70 Mon Sep 17 00:00:00 2001
From: erio <asakifeng@gmail.com>
Date: Fri, 6 Mar 2026 13:54:25 +0800
Subject: [PATCH] fix: OpenAI passthrough accounts bypass model mapping check
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透传模式账号仅替换认证，应允许所有模型通过。之前调度阶段的
isModelSupportedByAccount 不感知透传模式，导致 model_mapping
中未配置的新模型（如 gpt-5.4）被拒绝返回 503。
---
 backend/internal/service/gateway_service.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/backend/internal/service/gateway_service.go b/backend/internal/service/gateway_service.go
index 0fe2545ec0..f6c993a89c 100644
--- a/backend/internal/service/gateway_service.go
+++ b/backend/internal/service/gateway_service.go
@@ -3424,6 +3424,10 @@ func (s *GatewayService) isModelSupportedByAccount(account *Account, requestedMo
 	if account.Platform == PlatformSora {
 		return s.isSoraModelSupportedByAccount(account, requestedModel)
 	}
+	// OpenAI 透传模式：仅替换认证，允许所有模型
+	if account.Platform == PlatformOpenAI && account.IsOpenAIPassthroughEnabled() {
+		return true
+	}
 	// OAuth/SetupToken 账号使用 Anthropic 标准映射（短ID → 长ID）
 	if account.Platform == PlatformAnthropic && account.Type != AccountTypeAPIKey {
 		requestedModel = claude.NormalizeModelID(requestedModel)