[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC)：2025-09-05。"],[[["\u003cp\u003eVertex AI Search offers a selection of model versions for generating answers, accessible when using search summaries and answers with follow-ups.\u003c/p\u003e\n"],["\u003cp\u003eThere are two main types of models used by Vertex AI Search for question-and-answer tasks: Vertex AI LLM models and Vertex AI Search models, the latter being further trained based on LLMs.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003estable\u003c/code\u003e model designation in Vertex AI Search automatically updates to the most current model version available, whereas other model versions remain frozen after their release.\u003c/p\u003e\n"],["\u003cp\u003eVertex AI Search models share the same discontinuation date as their base Vertex AI LLM models, with the base LLM models being supported for six months after the release of the subsequent version.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003epreview\u003c/code\u003e model specfication uses the latest \u003ccode\u003egemini-1.5-pro-002\u003c/code\u003e model, and is subject to change without notification.\u003c/p\u003e\n"]]],[],null,["# Answer generation model versions and lifecycle\n\nAI Applications offers multiple model versions for you to choose when\ngenerating answers. You can choose the model versions when using [search\nsummaries](/generative-ai-app-builder/docs/get-search-summaries) and [answers and\nfollow-ups](/generative-ai-app-builder/docs/answer).\n\nAvailable models\n----------------\n\nAI Applications uses two types of models for question and answering\nuse cases:\n\n- Vertex AI LLM models that have been tested on question and answering tasks\n- AI Applications models that are based on Vertex AI LLM models and further trained to address question and answering tasks\n\nAI Applications models share the same discontinuation date as their\nbase Vertex AI LLM models. The base LLM model is available for six\nmonths after the release date of the next version of the model, per the [Vertex\nAI model lifecycle\npolicy](/vertex-ai/generative-ai/docs/learn/model-versioning).\nLeave enough time to migrate to new models before the discontinuation dates.\n\nThe following table lists model version specifications. When you set a model\nspecification, the API uses the specified model to generate answers.\n\nWhat's next\n-----------\n\n- [Get search summaries](/generative-ai-app-builder/docs/get-search-summaries)"]]
