How to Use Gemini 3.5 Flash and Gemini Omni for Free: Entry Points for Users and Developers

After Google released Gemini 3.5 Flash and Gemini Omni, the practical question is not the benchmark score, but how ordinary users and developers can actually use them, which entry points are free, and which ones are only low-friction trials.

The short version:

For chat, writing, image understanding, and everyday Q&A: use Gemini app first.
To test Gemini 3.5 Flash parameters, prompts, and multimodal input: use Google AI Studio.
To call Gemini 3.5 Flash from code: create an API key in AI Studio.
To try it from the terminal for free: look at Gemini CLI.
To try Gemini Omni video editing: start with Gemini app and Google Flow.
For real production use: do not rely on free quotas; move to a paid API or Vertex AI.

Note: free quotas, regional availability, subscription tiers, and model menus change over time. This article was written on May 20, 2026. Before official use, always check Google’s current pages.

Free Gemini 3.5 Flash Method 1: Gemini App

The simplest entry point is Gemini app:

https://gemini.google.com/

The basic flow is straightforward:

Open Gemini.
Sign in with a Google account.
Look for 3.5 Flash in the model selector.
Start chatting.

This entry point is best for ordinary users. You can use it for writing, summarization, image understanding, file analysis, everyday Q&A, and simple planning. According to public reports, Gemini 3.5 Flash has been made available to users globally and can be selected from Gemini’s model dropdown.

The limits are also clear: free users usually face daily message, regional, and feature limits. If you exceed the limit, you need to wait for the quota to refresh or upgrade your subscription.

Free Gemini 3.5 Flash Method 2: Google AI Studio

If you want more than chat, and need to tune prompts, inspect parameters, or test structured output, Google AI Studio is a better fit:

https://aistudio.google.com/

Basic flow:

Sign in to Google AI Studio.
Create a new prompt.
Select gemini-3.5-flash in the model dropdown.
Enter the prompt and run it.

AI Studio gives you more control. You can adjust temperature, system instructions, structured output, and multi-image input, and you can export a working prompt into code or an API call.

For developers, AI Studio is a free testing bench. Tune the prompt and input format here first, then move into API integration to avoid wasting quota.

Free Gemini 3.5 Flash Method 3: Free API Key

Developers care most about the API. AI Studio can create a Gemini API key for calling gemini-3.5-flash.

Basic flow:

Open Google AI Studio.
Find Get API key.
Select or create a project.
Create an API key.
Save the key to a local environment variable.

Python example:

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import os
from google import genai

client = genai.Client(api_key=os.environ["GEMINI_API_KEY"])

response = client.models.generate_content(
    model="gemini-3.5-flash",
    contents="Explain in three sentences what Gemini 3.5 Flash is best suited for."
)

print(response.text)

Node.js example:

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import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({ apiKey: process.env.GEMINI_API_KEY });

const response = await ai.models.generateContent({
  model: "gemini-3.5-flash",
  contents: "Explain in three sentences what Gemini 3.5 Flash is best suited for."
});

console.log(response.text);

curl example:

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curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"contents":[{"parts":[{"text":"Hello Gemini 3.5 Flash"}]}]}'

Public information suggests that the AI Studio free tier usually gives Gemini Flash models a daily request allowance. The exact numbers can vary by time, region, and account status. Common claims include around 1,500 requests per day, per-minute request limits, and token limits. Do not bake those numbers into a production plan; check Google’s current pricing and limits pages before launch.

Free Gemini 3.5 Flash Method 4: Gemini CLI

If you like the command line, look at Gemini CLI. It is useful for temporary scripts, repository summaries, file reading, and quick Q&A in the terminal.

Installation is usually:

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npm install -g @google/gemini-cli

Then run:

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gemini

The CLI is better suited to personal developer workflows than production integration. Production should still use API keys, service accounts, permission controls, and auditable calling patterns.

Free or Low-Friction Gemini Omni Access: Gemini App and Google Flow

Gemini Omni is a multimodal model for video creation and editing. Its core capability is not ordinary text Q&A, but multi-turn video editing with natural language while referencing image, text, video, and audio inputs.

The Google DeepMind page lists these entry points:

Gemini app.
Google Flow.
YouTube Shorts.

The page also notes that a Google AI subscription is required, and that features vary by subscription tier and region. So “free access” to Gemini Omni should be understood more carefully: some entry points may let free users see or try part of the experience, but full video editing may require a subscription, regional availability, or product rollout access.

If you only want to try it, use this order:

Open Gemini app first and check whether Gemini Omni or a related video editing entry is available.
Then open Google Flow: https://flow.google/
If you make short-form content, watch for Omni-related editing features in YouTube Shorts.

If the entry point is not visible, it usually does not mean you did something wrong. Your account, region, subscription tier, or rollout group may simply not qualify yet.

How Gemini Omni Is Best Used

Gemini Omni is more suitable for creators than for ordinary chat.

You can try these directions:

Upload or select a video and ask it to change the style.
Make a specific action in the video more exaggerated.
Use a reference image to replace an object or character in the scene.
Modify camera, action, environment, and style over multiple turns.
Combine sketches, reference images, audio, or video into a new output.

You can write prompts as if giving instructions to an editor:

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Keep the original person and room structure unchanged. Change the effect after touching the mirror into liquid ripples. The motion should feel natural, and the lighting should not change abruptly.

For multi-turn editing, do not pack too many requirements into one request. A safer approach is:

Change the main action first.
Then change the style.
Then adjust the camera angle.
Finally tune sound, text, and rhythm.

This makes consistency easier to maintain and helps you identify which step caused a problem.

Common Pitfalls When Using Free Access

First, free quota is not production quota. A free API key is suitable for testing, personal tools, and prototypes, not for promising a stable service.

Second, do not send sensitive data to free or third-party entry points. This includes private code, customer data, contracts, keys, financial spreadsheets, and internal documents.

Third, check data-use settings. Free tiers may have different data-use policies, so review the settings in AI Studio or your Google account before use.

Fourth, video capabilities are usually more restricted than text capabilities. Gemini Omni-style video editing may be limited by subscription, region, queueing, duration, resolution, and content safety policies.

Fifth, be careful with third-party “unlimited free API” services. Many gateways rate-limit, forward requests, keep logs, or use opaque payment methods. Sensitive work should not go through these entry points.

Which Entry Point Should You Choose?

If you are an ordinary user:

Gemini 3.5 Flash: use Gemini app.
Gemini Omni: check Gemini app first, then Google Flow.

If you are a creator:

Use Google Flow to try Omni video workflows.
Use Gemini app for scripts, storyboards, prompts, and material descriptions.

If you are a developer:

Use AI Studio to debug prompts.
Use an API key to integrate gemini-3.5-flash.
Use Gemini CLI for personal terminal workflows.
For production, consider Vertex AI or the paid API.

If you are an enterprise:

Do not rely on free quotas.
Focus on permissions, logs, audits, data residency, compliance, and key management.
For video generation and editing, add watermarking, content review, and copyright processes.

Summary

Gemini 3.5 Flash has relatively clear free access paths: Gemini app, Google AI Studio, AI Studio API key, and Gemini CLI can all serve as low-friction entry points. It is suitable for chat, writing, coding, agent prototypes, and multimodal testing.

Gemini Omni focuses on video editing and multimodal creation. Its main entry points are Gemini app, Google Flow, and YouTube Shorts, but full capabilities are more likely to depend on subscription and region. It is best for creators to start with trials and concept validation, not to plan around it as a stable production service from day one.

The safest strategy is: test text and code tasks first with the Gemini 3.5 Flash free tier; validate video creation effects with Gemini Omni in Gemini app or Flow; when you need to launch something real, move to a formal setup with auditability, billing, and controlled permissions.

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