> Kimi K2 (Sep 2025) is an open-weights AI model from Moonshot, released 5 Sep 2025. API price $0.60 in / $2.5 out per million tokens, 262K context.

[Models](https://themodelindex.org/models/) /[Moonshot](https://themodelindex.org/labs/moonshot/)

# Kimi K2 (Sep 2025)

Moonshot

Released 5 Sep 2025

Open

[Compare](https://themodelindex.org/compare/kimi-k2-sep-2025-vs-gpt-5/)

–

Index score

Not yet evaluated independently

0/ 8

Core tests taken

0 of 6 areas · plus 1 anchor tests

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Versus the frontier at release

Replaced by [Kimi K2.5](https://themodelindex.org/models/kimi-k2-5/)

$0.60/ $2.5

Price per million tokens

input / output, list price

262K

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_

o1 reached this score 9 months earlier.

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

Show 1 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

no result

Agents

no evidence yet

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

Not on any of the rankings we follow yet.

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 Kimi K2.5; 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

Kimi

app · subscription

↗

Moonshot API

API

↗

#### API providers · 1 · per million tokens, in / out

N

Novita

$0.60 / $2.5 · fp8

cheapest

#### Run it yourself

🤗

Official weights

moonshotai/Kimi-K2-Instruct-0905

↗

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

5 Sep 2025

Announcement

not linked yet

Release entry

–

Scored as

Kimi K2 (Sep 2025)

Artificial Analysis index

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Output speed

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Hugging Face

[moonshotai/Kimi-K2-Instruct-0905 ↗](https://huggingface.co/moonshotai/Kimi-K2-Instruct-0905)

## Moonshot releases · around this one

Kimi Chat

Closed

9 OCT 2023

Kimi k1.5

Closed

20 JAN 2025

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Source: https://themodelindex.org/models/kimi-k2-sep-2025/ · The Model Index · data as of 2026-10-01