> Claude Opus 4.6 is a closed AI model from Anthropic, released 5 Feb 2026. Index score 167 (GPT-4 = 100), rank 26 of 229 ranked models. API price $5.0 in / $25 out per million tokens, 1M context.

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# Claude Opus 4.6

Anthropic

Released 5 Feb 2026

Closed

Flagship

Date verified

[Compare](https://themodelindex.org/compare/claude-opus-4-6-vs-kimi-k2-5/) [Announcement](https://www.anthropic.com/news/claude-opus-4-6)

167155–178

Index score

#26 of 229 models

8/ 8

Core tests taken

6 of 6 areas · plus 19 anchor tests

−3

Versus the frontier at release

best then: GPT-5.3-Codex

Replaced by [Claude Opus 4.7](https://themodelindex.org/models/claude-opus-4-7/)

$5.0/ $25

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_

Among the first models to reach this score.

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

Show 13 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

91%

Humanity's Last Exam

34%

Maths

evidence

FrontierMath T1-3

66%

Coding

evidence

SWE-bench Verified

79%

Terminal-Bench

80%

Agents

evidence

APEX-Agents

46%

Novel problems

evidence

ARC-AGI-2

69%

Long tasks

evidence

METR time horizon

12 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

#26

of 219 · 167

Epoch Capabilities Index

overall capability from many benchmarks

#27

of 239 · 155.3

LiveBench · Overall

overall, with fresh questions to limit contamination

#35

of 58 · 74.5

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

1st

SWE-bench Verified

Epoch AI · independent

1st

METR time horizon

Epoch AI · independent

2nd

Terminal-Bench

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

↗

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

C

Claude Platform on AWS

$5.0 / $25

cheapest

A

Azure

$5.0 / $25

↗

G

Google

$5.5 / $27.5

↗

A

Amazon Bedrock

$5.0 / $25

↗

A

Anthropic

$5.0 / $25

↗

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 Feb 2026

Announcement

[anthropic.com ↗](https://www.anthropic.com/news/claude-opus-4-6)

Release entry

Claude Opus 4.6

Scored as

Claude Opus 4.6

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## Anthropic releases · around this one

Claude Haiku 4.5

Closed

15 OCT 2025

index 137

Claude Opus 4.5

Closed

24 NOV 2025

index 153

Claude Opus 4.6

Closed

5 FEB 2026

index 167

Claude Sonnet 4.6

Closed

17 FEB 2026

index 160

Claude Mythos Preview

Closed

7 APR 2026

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Source: https://themodelindex.org/models/claude-opus-4-6/ · The Model Index · data as of 2026-10-01