> Qwen 3.5 Plus (hosted 397B-A17B) is a closed AI model from Alibaba, released 16 Feb 2026. Index score 146 (GPT-4 = 100), rank 66 of 229 ranked models.

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# Qwen 3.5 Plus (hosted 397B-A17B)

Alibaba

Released 16 Feb 2026

Closed

[Compare](https://themodelindex.org/compare/qwen-3-5-plus-hosted-397b-a17b-vs-kimi-k2-5/)

146134–158

Index score

#66 of 229 models

1/ 8

Core tests taken

1 of 6 areas · plus 10 anchor tests

−24

Versus the frontier at release

best then: GPT-5.3-Codex

Replaced by [Qwen3.6-Plus](https://themodelindex.org/models/qwen3-6-plus/)

–

Price per million tokens

no public API price found

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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_

o3 reached this score 10 months earlier.

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

Show 8 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

85%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

no result

Coding

no evidence yet

SWE-bench Verified

no result

Terminal-Bench

no result

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

#66

of 219 · 146

Epoch Capabilities Index

overall capability from many benchmarks

#65

of 239 · 146.8

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 Qwen3.6-Plus; 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

Qwen Chat

app · subscription

↗

Alibaba Cloud Model Studio

API

↗

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

16 Feb 2026

Announcement

not linked yet

Release entry

–

Scored as

Qwen 3.5 Plus (hosted 397B-A17B)

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## Alibaba releases · around this one

Qwen

Closed

11 APR 2023

Tongyi Qianwen

Closed

11 APR 2023

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Source: https://themodelindex.org/models/qwen-3-5-plus-hosted-397b-a17b/ · The Model Index · data as of 2026-10-01