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Gemini 3.5 Flash Usage Tutorial ​

🚀 Google I/O just dropped a new generation of LLMs, and everyone is searching: how to use gemini3.5flash? To help developers and AI enthusiasts experience this model — built around "blazing speed and great value" — as soon as possible, this article rounds up the latest, most complete 5 ways to use Gemini 3.5 Flash.

Whether you're a regular user hunting for free access, a beginner looking for a VPN-free direct route in China, or a hardcore geek developer, this full-service tutorial not only teaches you how to use gemini3.5flash, but also comes with a detailed "major pitfall guide" to help you get past the hurdles quickly and experience Gemini 3.5 Flash's power smoothly!

📑 Table of Contents (Click to Jump) ​

Method 1: Upgrade Antigravity IDE to 2.0

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For developers who want to know how to use gemini3.5flash for coding, the fastest way is through Antigravity IDE.

If you already use the Antigravity environment, just open the client and upgrade to the latest 2.0 version, then in the model selection menu at the top of the editor, scroll down and switch to Gemini 3.5 Flash to start.

⚠️ Upgrade pitfalls to avoid:

  • 🚨 Pitfall 1: Google account login fails / can't verify Some users find they can't log into their Google account after upgrading. It's likely caused by cache or regional IP fluctuation. Fix: try fully signing out and signing back in, or switch to a cleaner global proxy environment.

  • 🚨 Pitfall 2: the IDE "goes missing" after the main client upgrade Antigravity 2.0 is a major update that separates the IDE from the main client into a standalone app. If you can't find where to code after upgrading the main client, it's because you haven't installed this new app locally — download and install it separately. 70

  • Official download: https://antigravity.google/download#antigravity-ide

Method 2: Use the Antigravity CLI

If you prefer typing in the terminal, the CLI is a great way to experience Gemini 3.5 Flash. In essence, you upgrade the old Gemini CLI to the Antigravity CLI, then launch it with the agy command.

⚠️ Prerequisite: before using the CLI, you need to complete login authorization with an Antigravity account or Antigravity IDE, otherwise the CLI can't run LLM conversations.

💻 macOS / Linux installation: Run the following directly in the terminal:

bash
curl -fsSL https://antigravity.google/cli/install.sh | bash

💻 Windows PowerShell installation:

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powershell
irm https://antigravity.google/cli/install.ps1 | iex

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After installing, close the terminal and reopen it, type agy --version to check the installation, then type agy to sign in. 74

In the terminal prompt, choose option 1 (Google OAuth login). 75

The browser will then open a Google login authorization page automatically (if it doesn't, copy the link shown in the terminal and open it manually in the browser to complete authorization).

💻 Windows CMD installation:

cmd
curl -fsSL https://antigravity.google/cli/install.cmd -o install.cmd && install.cmd && del install.cmd

Once installed, type agy in the terminal to launch it — if all goes well, you'll see the Gemini 3.5 Flash command-line interface.

Method 3: Google AI Studio

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Many people search for "how to use gemini3.5flash for free" — Google AI Studio is definitely your best bet! It's currently the most non-paid-user-friendly, highest-success-rate, most stable official channel from China.

  1. Open the site and sign in with your regular Google account.
  2. In the Model selector on the right panel, switch to Gemini 3.5 Flash (Preview) (note: if some interfaces show a Gemini 3 Pro preview, just pick the Flash version as needed).
  3. Start right away! The platform supports an ultra-long context of up to 1 million tokens — upload long videos, multi-page PDF papers, or even drag in an entire GitHub repo for the AI to analyze.

💡 Key advantage: use the latest models with no additional subscription, no strict API call limits, and the strongest native multimodal (vision/audio/text) capabilities — the best free platform to experience Google I/O's latest AI tech.

Method 4: Official Gemini Web & App

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For users who prefer a native ChatGPT-style web interface or a mobile native app, you can also use Gemini's official consumer channels, but be aware there's a usage threshold.

  • 🌐 Web address: https://gemini.google.com
  • 💳 Access requirements: free accounts can only use the base models by default. You'll need a Google AI Pro subscription (~$20/month) or higher Ultra plan to unlock the latest Gemini 3.5 Flash / Pro advanced models in the official web interface.
  • ✅ How to use it: if you're a subscribed Plus/Pro user, just pick the newly added Gemini 3.5 Flash model from the model dropdown at the top of the web interface or app and start high-speed conversations.

Method 5: Domestic Mirrors/Aggregators (VPN-Free Direct Access)

If you're facing network restrictions and don't want to wrestle with complex network setups and proxy tools, the best answer to "how to use gemini3.5flash in China" is a quality domestic third-party API aggregator — these platforms have already integrated Gemini 3.5 Flash (preview API) at lightning speed.

  • Recommended site to try: https://chatshare.biz
  • Platform advantages: accessible directly under normal domestic networks; supports one-click seamless switching between top global models like Gemini 3.5 Flash, GPT-5.5 and Claude 4.7. Ideal for light users and researchers who need to compare multiple models.

❓ FAQ & the Major Pitfall Guide

To help you avoid detours while exploring "how to use gemini3.5flash", here's a troubleshooting guide for the recent hot issues:

Q1: What exactly is the difference between Antigravity IDE and the Antigravity main client? ​

A: Since the big 2.0 update, the two are now completely separate apps. The IDE is specifically for writing code, debugging programs and integrating an AI-assisted coding environment, while the main client handles Google ecosystem account management and other non-coding features. For the full AI coding experience, we recommend installing both apps.

Q2: After installing the CLI, why does typing agy in the terminal say "Command not found"? ​

A: This usually happens because the install script failed to write the executable's environment variable path (Path) into your shell config file. ✅ Fix: manually refresh the environment variable config. In the terminal, run source ~/.bashrc or source ~/.zshrc (depending on which shell your Mac/Linux uses), then type agy again.

[🚨 Ultimate Pitfall] Q3: After upgrading to 2.0, all my old plugin configs and chat history are gone — what do I do?! ​

A: Don't panic! Your data is absolutely not lost — it's a local file storage path change caused by 2.0 splitting the IDE into a standalone app. Just manually rename two hidden folders and all your original configs and data will be recovered intact:

For macOS / Linux users, run or manually do the following two steps:

  1. Rename the old directory /Users/你的用户名/Library/Application Support/Antigravity to Antigravity IDE
  2. Rename the old directory /Users/你的用户名/.antigravity to .antigravity-ide

✅ Result: once the folders are renamed, restart your Antigravity IDE and you'll be pleasantly surprised to find your previously installed third-party plugins and precious AI chat history back, exactly as they were!

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