> Muse Spark 1.2 is a closed AI model from Meta, released 5 Aug 2026. Index score 166 (GPT-4 = 100), rank 30 of 229 ranked models. API price $1.25 in / $4.25 out per million tokens, 1.05M context.

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# Muse Spark 1.2

Meta

Released 5 Aug 2026

Closed

Flagship

[Compare](https://themodelindex.org/compare/muse-spark-1-2-vs-kimi-k3/)

166154–177

Index score

#30 of 229 models

1/ 8

Core tests taken

1 of 6 areas · plus 8 anchor tests

−21

Versus the frontier at release

best then: Claude Opus 5

Replaced by [Muse Spark 1.3](https://themodelindex.org/models/muse-spark-1-3/)

$1.25/ $4.25

Price per million tokens

input / output, list price

1.05M

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_

Claude Opus 4.6 reached this score 6 months earlier.

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

Show 8 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

no result

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

evidence

APEX-Agents

36%

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

#30

of 219 · 166

LMArena · Text

overall chat quality, judged by people

#10

of 388 · 1494

LMArena · Coding

coding questions in chat

#12

of 383 · 1535

LMArena · Vision

understanding images

#9

of 149 · 1292

LMArena · Creative writing

creative writing

#31

of 386 · 1453

Epoch Capabilities Index

overall capability from many benchmarks

#29

of 239 · 155.0

LiveBench · Overall

overall, with fresh questions to limit contamination

#17

of 58 · 78

LMArena · WebDev

building web apps and front ends

#41

of 123 · 1532

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

2nd

understanding images

LMArena · Vision

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

Meta AI

app · subscription

↗

#### API providers · 1 · per million tokens, in / out

M

Meta

$1.25 / $4.25

cheapest

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 Aug 2026

Announcement

not linked yet

Release entry

Muse Spark 1.2 (+ Muse Code)

Scored as

Muse Spark 1.2

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## Meta releases · around this one

Muse Spark

Closed

8 APR 2026

index 159

Muse Spark 1.1

Closed

9 JUL 2026

index 164

Muse Spark 1.2

Closed

5 AUG 2026

index 166

Muse Glimmer 30B

Open

10 AUG 2026

Muse Spark 1.3

Closed

2 SEP 2026

index 170

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Source: https://themodelindex.org/models/muse-spark-1-2/ · The Model Index · data as of 2026-10-01