> DeepSeek-R1-0528 is an open-weights AI model from DeepSeek, released 28 May 2025. Index score 134 (GPT-4 = 100), rank 105 of 229 ranked models.

[Models](https://themodelindex.org/models/) /[DeepSeek](https://themodelindex.org/labs/deepseek/)

# DeepSeek-R1-0528

DeepSeek

Released 28 May 2025

Open

Reasoning

[Compare](https://themodelindex.org/compare/deepseek-r1-0528-vs-o3-2025-04/) [Announcement](https://api-docs.deepseek.com/news/news250528/)

134123–146

Index score

#105 of 229 models

3/ 8

Core tests taken

3 of 6 areas · plus 9 anchor tests

−12

Versus the frontier at release

best then: o3

–

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_

o1 reached this score 6 months earlier.

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

Show 6 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

76%

Humanity's Last Exam

no result

Maths

evidence

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

evidence

ARC-AGI-2

1%

Long tasks

evidence

METR time horizon

31 min

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

#105

of 219 · 134

LMArena · Text

overall chat quality, judged by people

#111

of 388 · 1422

LMArena · Creative writing

creative writing

#113

of 386 · 1390

LMArena · Coding

coding questions in chat

#115

of 383 · 1464

LMArena · Maths

maths questions in chat

#149

of 373 · 1393

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

Not in the top three among current models on any category we track.

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

DeepSeek Chat

app · subscription

↗

DeepSeek API

API

↗

#### Run it yourself

🤗

Official weights

deepseek-ai/DeepSeek-R1-0528

↗

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

28 May 2025

Announcement

[api-docs.deepseek.com ↗](https://api-docs.deepseek.com/news/news250528/)

Release entry

DeepSeek-R1-0528

Scored as

DeepSeek-R1 (May 2025)

Artificial Analysis index

–

Weights

[huggingface.co/deepseek-ai/DeepSeek-R1-0528 ↗](https://huggingface.co/deepseek-ai/DeepSeek-R1-0528)

Output speed

–

Hugging Face

not linked

## DeepSeek releases · around this one

DeepSeek-V3

Open

26 DEC 2024

index 116

DeepSeek-R1

Open

20 JAN 2025

index 129

DeepSeek-R1-0528

Open

28 MAY 2025

index 134

DeepSeek-V3.1

Open

21 AUG 2025

index 132

DeepSeek-V3.2-Exp

Open

29 SEP 2025

index 143

---
Source: https://themodelindex.org/models/deepseek-r1-0528/ · The Model Index · data as of 2026-10-01