Jun 17, 2025
1,048,576 context
65,536 tokens output
Google
vs
Google
Gemini 2.5 Pro vs Gemini 1.5 Flash Deprecated
Compare Gemini 2.5 Pro and Gemini 1.5 Flash Deprecated across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus general-purpose AI workloads.
Unknown
N/A context
8,192 tokens output
Overview Comparison
Structured side-by-side differences for the highest-signal model metadata.
Gemini 2.5 Pro
Gemini 1.5 Flash Deprecated
Provider
The entity that currently provides this model.
Gemini 2.5 Pro
Google
Gemini 1.5 Flash Deprecated
Google
Model ID
The routed model identifier exposed by upstream providers.
Gemini 2.5 Pro
google/gemini-2.5-pro
Gemini 1.5 Flash Deprecated
N/A
Input Context Window
The number of tokens supported by the input context window.
Gemini 2.5 Pro
1,048,576
tokens
Gemini 1.5 Flash Deprecated
N/A
tokens
Maximum Output Tokens
The number of tokens that can be generated by the model in a single request.
Gemini 2.5 Pro
65,536 tokens
tokens
Gemini 1.5 Flash Deprecated
8,192 tokens
tokens
Open Source
Whether the model's code is available for public use.
Gemini 2.5 Pro
No
Gemini 1.5 Flash Deprecated
No
Release Date
When the model was first released.
Gemini 2.5 Pro
Jun 17, 2025
Gemini 1.5 Flash Deprecated
Unknown
Knowledge Cut-off Date
When the model's knowledge was last updated.
Gemini 2.5 Pro
2025-01-31
Gemini 1.5 Flash Deprecated
Unknown
API Providers
The providers that currently expose the model through an API.
Gemini 2.5 Pro
Google, Gemini API
Gemini 1.5 Flash Deprecated
Google
Modalities
Types of data each model can process or return.
Gemini 2.5 Pro
Text
Image
File
Audio
Video
Code
Gemini 1.5 Flash Deprecated
Text
Pricing Comparison
Compare current token pricing before you choose the cheaper or more scalable API option.
Gemini 2.5 Pro
Google
Input price
$1.25
Per 1M tokens
Output price
$10.00
Per 1M tokens
Gemini 1.5 Flash Deprecated
Google
Input price
N/A
Per 1M tokens
Output price
N/A
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 2.5 Pro
Gemini 1.5 Flash Deprecated
Code Generation
Generates and debugs code across languages, achieving a 63.8% score on the SWE-Bench Verified benchmark for real-world software engineering tasks.
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Extended Context Window
Processes up to 1,048,576 tokens in a single context, enabling analysis of large documents, codebases, or long conversation histories without truncation.
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
File
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Image
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Math and STEM Analysis
Handles complex mathematical reasoning and science problems, with benchmark performance cited across math and science evaluation suites.
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Multimodal Input
Accepts text, images, audio, video, and code as input within the same request, allowing mixed-media tasks to be handled in a single call.
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Reasoning
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Structured Output
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Structured Reasoning
Uses a thinking approach to work through multi-step problems, drawing logical conclusions before producing a final response rather than generating output directly.
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Text
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
Supported
Tool Use
Supports function calling and external tool integration, allowing the model to invoke defined tools and return structured results as part of a response.
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Tools
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Video
Gemini 2.5 Pro
Supported
Gemini 1.5 Flash Deprecated
—
Benchmark Comparison
Shared benchmark rows make it easier to compare performance where both models have published scores.
| Benchmark | Gemini 2.5 Pro | Gemini 1.5 Flash Deprecated |
|---|---|---|
|
AIME 2024
American math olympiad problems
|
||
|
GPQA Diamond
PhD-level science questions (biology, physics, chemistry)
|
||
|
HLE
Questions that challenge frontier models across many domains
|
||
|
LiveCodeBench
Real-world coding tasks from recent competitions
|
||
|
MATH-500
Undergraduate and competition-level math problems
|
||
|
MMLU-Pro
Expert knowledge across 14 academic disciplines
|
||
|
SciCode
Scientific research coding and numerical methods
|
Community discussion
What Reddit discussions say about Gemini 2.5 Pro vs Gemini 1.5 Flash Deprecated
Gemini 2.5 Pro and Gemini 1.5 Flash Deprecated 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/singularity, r/Bard, r/LocalLLaMA.
Why am I not paying like 200 bucks per month for it? It is the best model ever and destroys any of open ai's models. It feels illegal. Doesn't make sense. Free in ai studio + Best model ever. I love GOOGLE (especially Logan).
I just saw this update drop on X from Google AI Studio. They benchmarked **Gemini 3 Pro** against **Gemini 2.5 Pro** on a full run of **Pokémon Crystal** (which is significantly longer/harder than the standard Pokemon Red benchmark).
**The Results:**
**Completion:** It obtained all 16 badges and defeated the hidden boss Red (the hardest challenge in the game).
**Efficiency:** It accomplished this using **roughly half the tokens and turns** of the previous model (2.5 Pro).
This is a huge signal for **Agentic Efficiency.** Halving the token usage for a long-horizon task means the model isn't just **faster** ,it's making better decisions with less "flailing" or trial and error. It implies a massive jump in planning capability.
**Source: Google Ai studio( X article)**
🔗: https://x.com/i/status/2000649586847985985
AI tools related to Gemini 2.5 Pro vs Gemini 1.5 Flash Deprecated
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
AI Summarizer
Summarize and Translate Web Pages - Chrome Extension
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
Large Language Models (LLMs)
O.Translator
O.Translator is an AI-powered online translation platform designed to translate documents while maintaining their original formatting. It supports a wide range of file types, including PDF, DOCX, XLSX, PPTX, and EPUB. The service provides high-accuracy AI translations, easy editing tools, free previews, cost-effective pricing, data privacy, and team-based translation features.
Free
0 visits
14 saves
Which model should you choose?
Use the summary below to decide which model better fits your workflow, budget, and feature requirements.
Gemini 2.5 Pro
Gemini 2.5 Pro is a stronger fit for long-context workloads, reasoning-heavy tasks, tool-augmented workflows.
Gemini 1.5 Flash Deprecated
Gemini 1.5 Flash Deprecated is a stronger fit for general-purpose AI workloads.
Verdict
Choose Gemini 2.5 Pro if you prioritize long-context workloads, reasoning-heavy tasks, tool-augmented workflows. Choose Gemini 1.5 Flash Deprecated if your workflow depends more on general-purpose AI workloads.
FAQ
Common questions about Gemini 2.5 Pro vs Gemini 1.5 Flash Deprecated
What is the main difference between Gemini 2.5 Pro and Gemini 1.5 Flash Deprecated?
Gemini 2.5 Pro leans toward long-context workloads, reasoning-heavy tasks, tool-augmented workflows, while Gemini 1.5 Flash Deprecated is better suited to general-purpose AI workloads.
Which model is cheaper: Gemini 2.5 Pro or Gemini 1.5 Flash Deprecated?
Review both models' current pricing on this page to decide which option is more cost-effective.
Which model has the larger context window: Gemini 2.5 Pro or Gemini 1.5 Flash Deprecated?
Gemini 2.5 Pro is listed with a context window of 1,048,576, while Gemini 1.5 Flash Deprecated is listed with N/A.
How should I evaluate Gemini 2.5 Pro vs Gemini 1.5 Flash Deprecated for my use case?
This comparison currently includes 7 shared benchmark rows, helping you compare practical performance across overlapping evaluations.