> Claude Sonnet 5 is a closed AI model from Anthropic, released 30 Jun 2026. Index score 169 (GPT-4 = 100), rank 22 of 229 ranked models. API price $2.0 in / $10 out per million tokens, 1M context.

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# Claude Sonnet 5

Anthropic

Released 30 Jun 2026

Closed

Flagship

Date verified

[Compare](https://themodelindex.org/compare/claude-sonnet-5-vs-kimi-k3/) [Announcement](https://www.anthropic.com/news/claude-sonnet-5)

169158–180

Index score

#22 of 229 models

3/ 8

Core tests taken

3 of 6 areas · plus 14 anchor tests

−16

Versus the frontier at release

best then: Claude Fable 5

Replaced by [Claude Sonnet 5.5](https://themodelindex.org/models/claude-sonnet-5-5/)

$2.0/ $10

Price per million tokens

input / output, list price

1M

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_

GPT-5.3-Codex reached this score 5 months earlier.

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

Show 13 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

91%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

66%

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

evidence

APEX-Agents

55%

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

#22

of 219 · 169

LMArena · Coding

coding questions in chat

#35

of 383 · 1519

Epoch Capabilities Index

overall capability from many benchmarks

#23

of 239 · 156.3

LMArena · Maths

maths questions in chat

#42

of 373 · 1474

LMArena · Text

overall chat quality, judged by people

#51

of 388 · 1462

LMArena · Creative writing

creative writing

#56

of 386 · 1436

LMArena · Vision

understanding images

#34

of 149 · 1265

LMArena · WebDev

building web apps and front ends

#37

of 123 · 1540

LMArena · Documents

working with long documents

#16

of 41 · 1466

LiveBench · Overall

overall, with fresh questions to limit contamination

#28

of 58 · 76

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 Claude Sonnet 5.5; 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

Claude

app · subscription

↗

Claude API

API

↗

#### API providers · 5 · per million tokens, in / out

C

Claude Platform on AWS

$2.0 / $10

cheapest

A

Azure

$2.2 / $11

↗

G

Google

$2.2 / $11

↗

A

Amazon Bedrock

$2.2 / $11

↗

A

Anthropic

$2.0 / $10

↗

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

30 Jun 2026

Announcement

[anthropic.com ↗](https://www.anthropic.com/news/claude-sonnet-5)

Release entry

Claude Sonnet 5

Scored as

Claude Sonnet 5

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## Anthropic releases · around this one

Claude Fable 5

Closed

9 JUN 2026

index 185

Claude Mythos 5

Closed

9 JUN 2026

Claude Sonnet 5

Closed

30 JUN 2026

index 169

Claude Opus 5

Closed

24 JUL 2026

index 187

Claude Fable 5.1

Closed

1 SEP 2026

index 192

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Source: https://themodelindex.org/models/claude-sonnet-5/ · The Model Index · data as of 2026-10-01