> Gemini 2.5 Flash (Sep 2025) is a closed AI model from Google, released 25 Sep 2025. Index score 138 (GPT-4 = 100), rank 94 of 229 ranked models.

[Models](https://themodelindex.org/models/) /[Google](https://themodelindex.org/labs/google/)

# Gemini 2.5 Flash (Sep 2025)

Google

Released 25 Sep 2025

Closed

[Compare](https://themodelindex.org/compare/gemini-2-5-flash-sep-2025-vs-deepseek-v3-2-exp/)

138126–150

Index score

#94 · provisional, limited data

1/ 8

Core tests taken

1 of 6 areas · plus 3 anchor tests

−16

Versus the frontier at release

best then: GPT-5

Replaced by [Gemini 3 Flash](https://themodelindex.org/models/gemini-3-flash/)

–

Price per million tokens

no public API price found

–

Context window

tokens it reads at once

## Where it sits · on the frontier

_Chart: Model Index score of every scored model since late 2022, with the best closed and best open model over time_

Gemini 2.5 Pro reached this score 6 months earlier.

## Test results · by area · tick = best by any model

Show 2 anchor tests

Reasoning & knowledge

no evidence yet

GPQA Diamond

no result

Humanity's Last Exam

no result

Maths

no evidence yet

FrontierMath T1-3

no result

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

17%

Agents

evidence

APEX-Agents

no result

Novel problems

no evidence yet

ARC-AGI-2

no result

Long tasks

no evidence yet

METR time horizon

no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

## What others say · rank on each leaderboard

The Model Index

independent tests, our method

#94

of 219 · 138

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

## Best at · top three among current models

Replaced by Gemini 3 Flash; it no longer leads any category among current models.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

## Where to use it · prices checked 1 Oct 2026

#### From the lab

Gemini

app · subscription

↗

Google AI Studio

API

↗

#### API providers · 2 · per million tokens, in / out

G

Google AI Studio

$0.54 / $4.5

cheapest

G

Google

$0.54 / $4.5

↗

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

## Facts and sources

Released

25 Sep 2025

Announcement

not linked yet

Release entry

–

Scored as

Gemini 2.5 Flash (Sep 2025)

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## Google releases · around this one

PaLM 2

Closed

10 MAY 2023

Gemini 1.0 Nano

Closed

6 DEC 2023

---
Source: https://themodelindex.org/models/gemini-2-5-flash-sep-2025/ · The Model Index · data as of 2026-10-01