Google vs Google

Gemini 1.5 Pro Deprecated vs Gemini 3.5 Flash

Compare Gemini 1.5 Pro Deprecated and Gemini 3.5 Flash across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for general-purpose AI workloads versus reasoning-heavy tasks.

Overview Comparison

Structured side-by-side differences for the highest-signal model metadata.

Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash

Provider

The entity that currently provides this model.

Gemini 1.5 Pro Deprecated Google
Gemini 3.5 Flash Google

Model ID

The routed model identifier exposed by upstream providers.

Gemini 1.5 Pro Deprecated N/A
Gemini 3.5 Flash google/gemini-3.5-flash

Input Context Window

The number of tokens supported by the input context window.

Gemini 1.5 Pro Deprecated N/A tokens
Gemini 3.5 Flash $9.00 /MTok tokens

Maximum Output Tokens

The number of tokens that can be generated by the model in a single request.

Gemini 1.5 Pro Deprecated 8,192 tokens tokens
Gemini 3.5 Flash 65,536 tokens tokens

Open Source

Whether the model's code is available for public use.

Gemini 1.5 Pro Deprecated No
Gemini 3.5 Flash No

Release Date

When the model was first released.

Gemini 1.5 Pro Deprecated Unknown
Gemini 3.5 Flash May 19, 2026

Knowledge Cut-off Date

When the model's knowledge was last updated.

Gemini 1.5 Pro Deprecated Unknown
Gemini 3.5 Flash 2025-01-01

API Providers

The providers that currently expose the model through an API.

Gemini 1.5 Pro Deprecated
Google
Gemini 3.5 Flash
Google

Modalities

Types of data each model can process or return.

Gemini 1.5 Pro Deprecated
Text
Gemini 3.5 Flash
Text Image File Audio Video

Pricing Comparison

Compare current token pricing before you choose the cheaper or more scalable API option.

Gemini 1.5 Pro Deprecated Google
Input price N/A Per 1M tokens
Output price N/A Per 1M tokens
Gemini 3.5 Flash Google
Input price $1.50 Per 1M tokens
Output price $9.00 Per 1M tokens

Capabilities Comparison

See where each model overlaps, where they differ, and which one supports more of the features you care about.

Capability
Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash
File
Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash Supported
Image
Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash Supported
Reasoning
Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash Supported
Structured Output
Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash Supported
Text
Gemini 1.5 Pro Deprecated Supported
Gemini 3.5 Flash Supported
Tools
Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash Supported
Video
Gemini 1.5 Pro Deprecated
Gemini 3.5 Flash Supported

AI tools related to Gemini 1.5 Pro Deprecated vs Gemini 3.5 Flash

These tools are closely connected to one or both models in this comparison and can help you evaluate real-world fit.

The Gemini Chat Assistant Sidebar is a Chrome extension that functions as an AI assistant, similar to Microsoft Edge's Copilot, to improve your browsing experience. It enables you to chat with the Gemini AI model, analyze webpage content with one click, and request summaries or other intelligent tasks. The tool supports ongoing dialogue based on the content you process.

Free

Sider is an AI chatbot and assistant available on the App Store that turns your screen into an interactive hub powered by advanced AI models like ChatGPT, Claude, and Gemini. It provides a unified platform to access AI models, files, and images. Through the ChatScreen feature, you can interact with on-screen content using a double-tap or custom screenshot gesture. Sider functions as a versatile tool for work and study by analyzing, summarizing, and extracting text from your screen.

Free 0 visits 1 saves
AI Assistant

2Slash

2Slash is a browser extension that integrates AI directly into any text field. It enables users to generate social media content, Google Sheets formulas, and email replies, as well as improve grammar and explore various writing tasks. By typing '//' in any text field, users can quickly draft emails, translate text, correct grammar, write paragraphs, rephrase content, and generate code. 2Slash is designed to improve daily productivity by helping users engage with their community and enhance their social media presence through tailored responses and posts.

Free 0 visits 1 saves

The EcoTrack Chrome Extension helps users make sustainable choices directly within their browser. By connecting to the EcoTrack service and utilizing the Gemini 1.5 Pro AI model, this extension offers real-time data on product carbon footprints, recycling guidance, and sustainability tips. Featuring a React-based interface, EcoTrack provides environmental information to support informed, eco-friendly purchasing decisions.

Free

Which model should you choose?

Use the summary below to decide which model better fits your workflow, budget, and feature requirements.

Best fit for

Gemini 1.5 Pro Deprecated

Gemini 1.5 Pro Deprecated is a stronger fit for general-purpose AI workloads.

Best fit for

Gemini 3.5 Flash

Gemini 3.5 Flash is a stronger fit for reasoning-heavy tasks, tool-augmented workflows, multimodal applications.

Verdict

Choose Gemini 1.5 Pro Deprecated if you prioritize general-purpose AI workloads. Choose Gemini 3.5 Flash if your workflow depends more on reasoning-heavy tasks, tool-augmented workflows, multimodal applications.

FAQ

Common questions about Gemini 1.5 Pro Deprecated vs Gemini 3.5 Flash

What is the main difference between Gemini 1.5 Pro Deprecated and Gemini 3.5 Flash?

Gemini 1.5 Pro Deprecated leans toward general-purpose AI workloads, while Gemini 3.5 Flash is better suited to reasoning-heavy tasks, tool-augmented workflows, multimodal applications.

Which model is cheaper: Gemini 1.5 Pro Deprecated or Gemini 3.5 Flash?

Review both models' current pricing on this page to decide which option is more cost-effective.

Which model has the larger context window: Gemini 1.5 Pro Deprecated or Gemini 3.5 Flash?

Gemini 1.5 Pro Deprecated is listed with a context window of N/A, while Gemini 3.5 Flash is listed with $9.00 /MTok.

How should I evaluate Gemini 1.5 Pro Deprecated vs Gemini 3.5 Flash for my use case?

Use the feature, pricing, and context comparisons on this page to evaluate the two models.