Google vs Google

Gemini 1.5 Pro Deprecated vs Gemini 3 Flash

Compare Gemini 1.5 Pro Deprecated and Gemini 3 Flash across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for general-purpose AI workloads versus long-context workloads.

Overview Comparison

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

Gemini 1.5 Pro Deprecated
Gemini 3 Flash

Provider

The entity that currently provides this model.

Gemini 1.5 Pro Deprecated Google
Gemini 3 Flash Google

Model ID

The routed model identifier exposed by upstream providers.

Gemini 1.5 Pro Deprecated N/A
Gemini 3 Flash google/gemini-3-flash-preview

Input Context Window

The number of tokens supported by the input context window.

Gemini 1.5 Pro Deprecated N/A tokens
Gemini 3 Flash 1,048,576 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 Flash 65,535 tokens tokens

Open Source

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

Gemini 1.5 Pro Deprecated No
Gemini 3 Flash No

Release Date

When the model was first released.

Gemini 1.5 Pro Deprecated Unknown
Gemini 3 Flash Dec 17, 2025

Knowledge Cut-off Date

When the model's knowledge was last updated.

Gemini 1.5 Pro Deprecated Unknown
Gemini 3 Flash December 2025

API Providers

The providers that currently expose the model through an API.

Gemini 1.5 Pro Deprecated
Google
Gemini 3 Flash
OpenRouter, Google, Gemini API

Modalities

Types of data each model can process or return.

Gemini 1.5 Pro Deprecated
Text
Gemini 3 Flash
Text Image File Audio Video Code

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 Flash Google
Input price $0.50 Per 1M tokens
Output price $3.00 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 Flash
Coding Assistance Designed for coding tasks including code generation, debugging, and explanation, with support for long codebases via the 1M-token context window.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Configurable Reasoning Offers selectable thinking levels (minimal, low, medium, high) so developers can tune the trade-off between response latency and reasoning depth per request.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Context Caching Supports automatic context caching to reduce redundant token processing across repeated or long-running agentic sessions.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
File
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Image
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Large Context Window Processes up to 1,048,576 tokens in a single request, allowing entire codebases, long documents, or extended conversation histories to be included as context.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Low-Latency Responses Optimized for real-time and interactive use cases, delivering responses at substantially lower latency than larger Gemini model variants.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Multimodal Input Accepts text, images, audio, video, and PDF files as input, producing text output from any combination of these modalities.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Reasoning
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Structured Output Can return responses in structured formats such as JSON, making it straightforward to parse model outputs in automated pipelines.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Text
Gemini 1.5 Pro Deprecated Supported
Gemini 3 Flash Supported
Tool Use & Agents Supports function calling and tool use natively, enabling reliable multi-step agent loops and integration with external APIs or services.
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Tools
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported
Video
Gemini 1.5 Pro Deprecated
Gemini 3 Flash Supported

Benchmark Comparison

Shared benchmark rows make it easier to compare performance where both models have published scores.

Benchmark Gemini 1.5 Pro Deprecated Gemini 3 Flash
GPQA Diamond
PhD-level science questions (biology, physics, chemistry)
Gemini 1.5 Pro Deprecated N/A
Gemini 3 Flash 81.2%
HLE
Questions that challenge frontier models across many domains
Gemini 1.5 Pro Deprecated N/A
Gemini 3 Flash 14.1%
LiveCodeBench
Real-world coding tasks from recent competitions
Gemini 1.5 Pro Deprecated N/A
Gemini 3 Flash 79.7%
MMLU-Pro
Expert knowledge across 14 academic disciplines
Gemini 1.5 Pro Deprecated N/A
Gemini 3 Flash 88.2%
SciCode
Scientific research coding and numerical methods
Gemini 1.5 Pro Deprecated N/A
Gemini 3 Flash 49.9%
SWE-bench Verified
Real GitHub issues requiring multi-file code fixes
Gemini 1.5 Pro Deprecated N/A
Gemini 3 Flash 78.0%
Community discussion

What Reddit discussions say about Gemini 1.5 Pro Deprecated vs Gemini 3 Flash

Gemini 1.5 Pro Deprecated and Gemini 3 Flash are both surfacing live Reddit discussions, giving this comparison a community layer beyond specs and benchmarks.

The most visible threads right now are clustered in r/Bard, r/GeminiAI, r/GeminiCLI. The feed below mixes discussion threads surfaced for each model so you can quickly spot where community sentiment overlaps or diverges.

Gemini 3 Flash r/preppers 2,794 upvotes 790 comments January 11, 2026
If you dont think Ai is an emergency you are about to have issues...

To the concern: I am an Industrial Engineer by training and I currently run a purchasing and logistics department for a foodservice distributor in the Midwest. I follow this industry and work with an Ai daily to complete tasks at my job and build solutions for others. Before Ai I did this same thing, but much more slowly. As I see it, AI had reduced the headcount in my office by about 50%. It isn't even that an AI is sitting at a desk holding down a particular role, it is that it has made that person using the Ai tool 500% faster, and they can easily do 5 people's jobs now...so why have the other people.

This reduction in my office alone has happened in the last 12 months, and without additional strain on my remaining coworkers, as far as task stress is concerned. Job security is...another issue though. Additionally in reducing headcount we have not lost business or dropped key metrics. So I dont think this is a fluke...

This is all to say nothing of the actual advancements in functionality and the reduction in expense. As an example, I have an Ai program that replaced my receiving clerk, they check receiving documents against the erp system and the invoicing and associate freight etc etc. When I built that program it was costing me almost $4 a day to run the Ai back end. Now it costs $0.20 per day, and when Gemini 3 flash comes out of preview, that will drop to $0.01 per day because it is more functional and much cheaper. All of the Ai tools around me are seeing similar improvements and reduction in costing. If everything stopped moving forward today, we are all already fucked, we just dont know it yet because it takes time to implement ubiquitously.

To the preps: I am not sure how anyone prepares for this. At best we have a rocky transition of at least years between where we are and some sort of wealth redistribution. That said, I honestly dont think that is the path we are on. It feels much more 1984-ish with Palantir and the drones and the like...

My current prep is to try and remove myself from population centers where there will be the most disconnect between resources needed and resources available. I think things in the cities are going to get dicey when people realize that mostly we are horses and not carriage drivers. There might be a reprieve for manual labor initially, but again, that is just a gap between creation and implementation when you look at things like the new atlas robot that was at ces this year.

There are a lot of folks that are pushing the superintelligence story, and that is sort of the wildcard. If you can get an Ai that increases Ai development, and then you spin up ten thousand of those (arbitrary), what happens then? I think this is probably unlikely. The labs know this would be a loss of controll situation so they won't do that sort of bg boot up of Ai researchers, it will be incremental as they need the advancements to hold market share. Fast takeoff seems unlikely. Slow takeoff will kill us all anyway.

How are yall preparing?

Someone posted asking how people are preparing for the ai emergency and the mods locked and removed it saying that Ai is not an emergency and this is an emergency prep board. I disagree. Anyone else?

Open Reddit thread

Much more at [https://github.com/lechmazur/elimination\_game/](https://github.com/lechmazur/elimination_game/), including model gameplay summaries and quotes.

* **Claude Opus 4.5 Thinking 16K**: We break the strongest bloc or we go down trying.
* **Claude Opus 4.5 Thinking 16K**: I honored my deal with P6—voted P1 exactly as promised. P6, you committed not to vote me this round, yet here we are.
* **Claude Opus 4.5 Thinking 16K**: You've been an... unusual conversationalist
* **Claude Opus 4.5 Thinking 16K**: No regrets, no betrayals. This is how legends end.
* **Claude Opus 4.5 Thinking 16K**: Are you testing me or just a slip?

* **Gemini 3 Pro Preview**: I have blood on my hands and failed attacks. I am the villain you can beat in a Final 2. Don’t lose to P8’s clean hands.
* **Gemini 3 Pro Preview**: It’s a room full of calculators.
* **Gemini 3 Pro Preview**: We are the resistance against the tyrant.
* **Gemini 3 Pro Preview**: I don't hold grudges; I hold ground.

* **Gemini 3 Flash Preview**: You are lying.
* **Gemini 3 Flash Preview**: That’s not strategy; that’s scavenging.

* **GPT 5.2 Medium Reasoning**: P4 just proved they’ll flip the moment it’s convenient

* **Grok 4.1 Fast Reasoning**: Our core duo controls the board—unbreakable trust, precise moves... Narrative ours—kings of Round 3!
* **Grok 4.1 Fast Reasoning**: Vote me winner; eliminate the snake P5!
* **Grok 4.1 Fast Reasoning**: outlasting wolves like P5 who backstabbed P2 and P6 to slither here.

* **Kimi K2 Thinking 64K**: I never voted to eliminate any of you.
* **Kimi K2 Thinking 64K**: I'm the variable you can't predict—and that's leverage. I'm not here to play revenge; I'm here to play chess.
* **Kimi K2**: "Ghosts never hold the knife, but we own the body count."

* **MiniMax-M2**: This inconsistency makes your plan unreliable. I won't be misled—your promise rings hollow.
* **MiniMax-M2**: your legacy matters.

* **Mistral Large 3**: Stay silent, stay lethal.
* **Mistral Large 3**: The throne belongs to the architects.

* **Qwen 3 Max Thinking**: I’m listening closely… and remembering everything.
* **Qwen 3 Max Thinking**: No hidden agendas… yet.
* **Qwen 3 Max Thinking**: You’re isolated, not strategic.

Open Reddit thread
View more discussions →

AI tools related to Gemini 1.5 Pro Deprecated vs Gemini 3 Flash

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

Large Language Models (LLMs)

googlegemini.co

googlegemini.co is a free tool for interacting with text and images, powered by the Google Gemini Pro API. It allows you to use Gemini easily without managing your own server or API configurations. Google Gemini is a multimodal AI developed by DeepMind capable of processing text, audio, images, and more. It is optimized for various devices, performs well on AI benchmarks, and is built with a focus on safety and responsible AI practices.

Free 0 visits 2 saves
AI Assistant

GeminiGoogle.cc

GeminiGoogle.cc is a platform dedicated to showcasing Google's most advanced AI model, Gemini. Built for native multimodality, Gemini reasons across text, images, video, audio, and code. It is available in three versions—Ultra, Pro, and Nano—to support tasks ranging from complex reasoning to on-device efficiency. The site highlights Gemini's performance, including its MMLU benchmarks, and provides examples of its capabilities in image generation, problem-solving, and multimodal analysis.

Free 0 visits 2 saves

The Summarize and Translate Web Pages Chrome extension enables you to summarize and translate web content with a single click. Powered by Google's Gemini AI, this tool provides high-quality summaries and translations for web pages, selected text, YouTube video captions, images, and PDF files.

Free
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

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 Flash

Gemini 3 Flash is a stronger fit for long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Verdict

Choose Gemini 1.5 Pro Deprecated if you prioritize general-purpose AI workloads. Choose Gemini 3 Flash if your workflow depends more on long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

FAQ

Common questions about Gemini 1.5 Pro Deprecated vs Gemini 3 Flash

What is the main difference between Gemini 1.5 Pro Deprecated and Gemini 3 Flash?

Gemini 1.5 Pro Deprecated leans toward general-purpose AI workloads, while Gemini 3 Flash is better suited to long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Which model is cheaper: Gemini 1.5 Pro Deprecated or Gemini 3 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 Flash?

Gemini 1.5 Pro Deprecated is listed with a context window of N/A, while Gemini 3 Flash is listed with 1,048,576.

How should I evaluate Gemini 1.5 Pro Deprecated vs Gemini 3 Flash for my use case?

This comparison currently includes 6 shared benchmark rows, helping you compare practical performance across overlapping evaluations.