> Muse Spark 1.1 is a closed AI model from Meta, released 9 Jul 2026. Index score 164 (GPT-4 = 100), rank 35 of 229 ranked models. API price $1.25 in / $4.25 out per million tokens, 1.05M context.

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# Muse Spark 1.1

Meta

Released 9 Jul 2026

Closed

Flagship

[Compare](https://themodelindex.org/compare/muse-spark-1-1-vs-kimi-k3/) [Announcement](https://about.fb.com/news/2026/07/meta-ai-muse-spark-doesnt-just-think-it-acts/)

164152–175

Index score

#35 · provisional, limited data

0/ 8

Core tests taken

0 of 6 areas · plus 6 anchor tests

−21

Versus the frontier at release

best then: Claude Fable 5

Replaced by [Muse Spark 1.2](https://themodelindex.org/models/muse-spark-1-2/)

$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 5 months earlier.

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

Show 5 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

no result

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

#35

of 219 · 164

LMArena · Text

overall chat quality, judged by people

#12

of 388 · 1492

LMArena · Coding

coding questions in chat

#13

of 383 · 1534

LMArena · Maths

maths questions in chat

#22

of 373 · 1491

LMArena · Creative writing

creative writing

#38

of 386 · 1448

Epoch Capabilities Index

overall capability from many benchmarks

#34

of 239 · 154.3

LMArena · Vision

understanding images

#24

of 149 · 1280

LMArena · WebDev

building web apps and front ends

#36

of 123 · 1542

LMArena · Documents

working with long documents

#17

of 41 · 1465

LiveBench · Overall

overall, with fresh questions to limit contamination

#31

of 58 · 75.3

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 Muse Spark 1.2; 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

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

9 Jul 2026

Announcement

[about.fb.com ↗](https://about.fb.com/news/2026/07/meta-ai-muse-spark-doesnt-just-think-it-acts/)

Release entry

Muse Spark 1.1 (Meta Model API preview)

Scored as

Muse Spark 1.1

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## Meta releases · around this one

Llama 4 Scout

Open

5 APR 2025

index 111

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

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