AI model comparison

Gemini 3 Flash Preview vs Gemini 2.5 Flash

Side by side comparison of Gemini 3 Flash Preview and Gemini 2.5 Flash on pricing, benchmark scores, context window, and more.

Gemini 3 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance.

Input / 1M: $0.50
Output / 1M: $3
Context: 1.05M

Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks.

Input / 1M: $0.30
Output / 1M: $2.50
Context: 1.05M

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At a glance

Quick verdict

How the two models stack up on the things people ask about most.

Lower price

Gemini 2.5 Flash

1.4x cheaper for a typical chat

Higher intelligence score

Not available

Not enough benchmark data

Larger context window

Tie

1.05M vs 1.05M tokens

Newer release

Gemini 3 Flash Preview

Released December 17, 2025

Pricing

Gemini 3 Flash Preview vs Gemini 2.5 Flash API pricing

Per-token API rates. Cheaper option highlighted.

Metric	Gemini 3 Flash Preview	Gemini 2.5 Flash
Input tokensPer 1M tokens	$0.50	$0.30
Output tokensPer 1M tokens	$3	$2.50
Cached input (read)Per 1M tokens	$0.05	$0.03
Cache writePer 1M tokens	$0.08	$0.08
Web searchPer request	$0.014	$0.014

What it costs in practice

Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.

Chat message

2K in, 500 out

Gemini 3 Flash Preview$2.50

Gemini 2.5 Flash$1.85

Coding task

30K in, 4K out

Gemini 3 Flash Preview$27$13.50 cached

Gemini 2.5 Flash$19$10.90 cached

Long document summary

150K in, 2K out

Gemini 3 Flash Preview$81$13.50 cached

Gemini 2.5 Flash$50$9.50 cached

Specs

Context window and capabilities

How much each model can read, how much it can write, and what it accepts as input.

Metric	Gemini 3 Flash Preview	Gemini 2.5 Flash
Context window	1.05M tokens	1.05M tokens
Max output	66K tokens	66K tokens
Input types	Audio, File, Image, Text, Video	Audio, File, Image, Text, Video
Output types	Text	Text
Reasoning effort levels	High, Medium, Low, Minimal, None	Not available
Default reasoning effort	Medium	Not available
Release date	December 17, 2025	June 17, 2025

Features

Supported features

API features available for each model.

Metric	Gemini 3 Flash Preview	Gemini 2.5 Flash
Tool calling	Supported	Supported
Structured outputs	Supported	Supported
JSON mode	Supported	Supported
Reasoning	Supported	Supported
Temperature	Supported	Supported
Stop sequences	Supported	Supported
Deterministic seed	Supported	Supported
Verbosity control	Not supported	Not supported

Our take

Gemini 2.5 Flash is 1.4x cheaper for a typical chat. The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.

FAQ

Frequently asked questions

Is Gemini 3 Flash Preview or Gemini 2.5 Flash cheaper?

Gemini 2.5 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 2.5 Flash costs $0.30 per 1M input tokens and $2.50 per 1M output tokens, while Gemini 3 Flash Preview costs $0.50 per 1M input tokens and $3 per 1M output tokens.

Which has a bigger context window, Gemini 3 Flash Preview or Gemini 2.5 Flash?

Gemini 3 Flash Preview supports up to 1.05M tokens of context, compared with 1.05M for Gemini 2.5 Flash.

Can I use Gemini 3 Flash Preview and Gemini 2.5 Flash at the same time?

Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Gemini 3 Flash Preview and Gemini 2.5 Flash answer side by side and keep the better response.

Why choose? Ask both.

Send one prompt to Gemini 3 Flash Preview and Gemini 2.5 Flash at the same time. Compare the answers side by side and keep the best one.

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