Gemini 4 Hydrogen 全球推送，免费用户可通过自动模型选择使用
Google 把 Gemini 4 Hydrogen 推到了免费用户的自动路由里，桌面、手机、网页全都有。不用付费就能在合适的 prompt 下用到它，想知道路由怎么判断的可以看官方文档。用 Gemini 的朋友今天打开 app 就能碰运气。
Google 宣布 Gemini 4 Hydrogen 从今天起面向全球用户推送，覆盖桌面端、移动端和网页端三端。免费用户不会直接指定该模型，而是通过 auto model selection（自动模型选择）机制获得访问：当系统判断某条 prompt 适合由 Gemini 4 Hydrogen 处理时，才会自动路由到该模型。
这一发布意味着免费层与付费层共享同一个新模型池，区别在于付费用户可以手动指定模型，免费用户则依赖路由策略。Google 同时更新了 Gemini 模型介绍页和 auto model selection 说明文档（goo.gle/4AxH40q），供用户查询各模型的能力差异和触发条件。
对普通用户而言，三端同步推送降低了尝新门槛；对开发者来说，auto model selection 的路由逻辑会影响成本与延迟的平衡，值得在 API 调用侧关注模型分配行为。
Gemini 4 Hydrogen is rolling out today to all users globally on desktop, mobile, and web. Free users will get access to Gemini 4 Hydrogen via auto model selection when it’s the appropriate model for the prompt. Learn more about Gemini models and auto model selection: goo.gle/4AxH40q📊 3 ⚡
This report is categorized under AITOP's "Models" desk, focusing on US frontier AI labs and Silicon Valley technology leaders. Within our cross-regional analytical framework, it directly maps to AI developer toolchains, coding agents, and engineering workflows and US-China foundation model benchmarks and commercialization comparison. Key entities and technical topics under continuous tracking include Gemini, Gemini 4 Hydrogen, Google, 自动模型选择.
Source attribution: curated from Google Gemini App (@GeminiApp). Cross-source corroboration: 11 independent sources have covered this development (including lmarena.ai, Logan Kilpatrick, Artificial Analysis), confirming industry-wide signal strength.
