> Claude Opus 4 is a closed AI model from Anthropic, released 22 May 2025. Index score 137 (GPT-4 = 100), rank 96 of 229 ranked models.

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# Claude Opus 4

Anthropic

Released 22 May 2025

Closed

Flagship

Date verified

[Compare](https://themodelindex.org/compare/claude-opus-4-vs-deepseek-r1-0528/) [Announcement](https://www.anthropic.com/news/claude-4)

137126–148

Index score

#96 of 229 models

5/ 8

Core tests taken

4 of 6 areas · plus 17 anchor tests

−10

Versus the frontier at release

best then: o3

Replaced by [Claude Opus 4.1](https://themodelindex.org/models/claude-opus-4-1/)

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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_

Gemini 2.5 Pro reached this score 2 months earlier.

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

Show 12 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

76%

Humanity's Last Exam

11%

Maths

evidence

FrontierMath T1-3

no result

Coding

evidence

SWE-bench Verified

71%

Terminal-Bench

no result

Agents

evidence

APEX-Agents

no result

Novel problems

evidence

ARC-AGI-2

9%

Long tasks

evidence

METR time horizon

1.7 h

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

#96

of 219 · 137

Epoch Capabilities Index

overall capability from many benchmarks

#92

of 239 · 142.7

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

3rd

SWE-bench Verified

Epoch AI · independent

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

Claude

app · subscription

↗

Claude API

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

22 May 2025

Announcement

[anthropic.com ↗](https://www.anthropic.com/news/claude-4)

Release entry

Claude Opus 4 + Sonnet 4

Scored as

Claude Opus 4

Artificial Analysis index

–

Output speed

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Hugging Face

closed weights

## Anthropic releases · around this one

Claude 3.5 Haiku

Closed

4 NOV 2024

index 107

Claude 3.7 Sonnet

Closed

24 FEB 2025

index 134

Claude Opus 4

Closed

22 MAY 2025

index 137

Claude Sonnet 4

Closed

22 MAY 2025

index 135

Claude Opus 4.1

Closed

5 AUG 2025

index 140

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Source: https://themodelindex.org/models/claude-opus-4/ · The Model Index · data as of 2026-10-01