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+---
+title: '升级到 V4.2'
+description: 'FastGPT 从旧版本升级到 V4.2 操作指南'
+icon: 'upgrade'
+draft: false
+toc: true
+weight: 763
+---
+
+99.9%用户不影响，升级 4.2 主要是修改了配置文件中 QAModel 的格式。从原先的数组改成对象：
+
+```json
+"QAModel": {
+    "model": "gpt-3.5-turbo-16k",
+    "name": "GPT35-16k",
+    "maxToken": 16000,
+    "price": 0
+}
+```
+
+改动目的是，我们认为不需要留有选择余地，选择一个最合适的模型去进行任务即可。