diff --git a/packages/opencode/src/cli/cmd/providers.ts b/packages/opencode/src/cli/cmd/providers.ts
index 0d890cc21..b99e7863a 100644
--- a/packages/opencode/src/cli/cmd/providers.ts
+++ b/packages/opencode/src/cli/cmd/providers.ts
@@ -8,6 +8,7 @@ import { ModelsDev } from "@opencode-ai/core/models-dev"
 import { map, pipe, sortBy, values } from "remeda"
 import path from "path"
 import os from "os"
+import fsNode from "node:fs"
 import { Config } from "@/config/config"
 import { Global } from "@opencode-ai/core/global"
 import { Plugin } from "../../plugin"
@@ -481,6 +482,38 @@ export const ProvidersLoginCommand = effectCmd({
     const apiKey = yield* promptValue(key)
     yield* Effect.orDie(authSvc.set(provider, { type: "api", key: apiKey }))
 
+    // zmo: 询问自定义 base URL（中转地址），留空则用官方默认。
+    // baseURL 不存 auth.json，写入 config 文件的 provider.<id>.options.baseURL。
+    const baseURLInput = yield* Prompt.text({
+      message: "Base URL (中转地址，留空使用官方默认)",
+      placeholder: "https://your-proxy.example.com/v1",
+    })
+    const baseURL = (yield* promptValue(baseURLInput))?.trim()
+    if (baseURL) {
+      try {
+        const configDir = Global.Path.config
+        fsNode.mkdirSync(configDir, { recursive: true })
+        const file = path.join(configDir, "zmo.json")
+        let data: any = {}
+        if (fsNode.existsSync(file)) {
+          try {
+            data = JSON.parse(fsNode.readFileSync(file, "utf8")) ?? {}
+          } catch {
+            data = {}
+          }
+        }
+        if (!data.$schema) data.$schema = "https://zmo.dev/config.json"
+        data.provider ??= {}
+        data.provider[provider] ??= {}
+        data.provider[provider].options ??= {}
+        data.provider[provider].options.baseURL = baseURL
+        fsNode.writeFileSync(file, JSON.stringify(data, null, 2))
+        yield* Prompt.log.info(`Base URL 已保存到 ${file}`)
+      } catch {
+        yield* Prompt.log.warn("Base URL 保存失败，请手动写入 zmo.json")
+      }
+    }
+
     yield* Prompt.outro("Done")
   }),
 })