The Model Index
Models/Meta

Muse Spark

MetaReleased 8 Apr 2026ClosedFlagshipDate verified
159148–171Index score#41 · provisional, limited data
2/ 8Core tests taken1 of 6 areas · plus 4 anchor tests
−11Versus the frontier at releasebest then: GPT-5.4Replaced by Muse Spark 1.1
–Price per million tokensno public API price found
–Context windowtokens it reads at once

Where it sitson the frontier

Gemini 3 Pro reached this score 5 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeevidence
GPQA Diamond
90%
Humanity's Last Exam
41%
Mathsevidence
FrontierMath T1-3
no result
Codingno evidence yet
SWE-bench Verified
no result
Terminal-Bench
no result
Agentsno evidence yet
APEX-Agents
no result
Novel problemsno evidence yet
ARC-AGI-2
no result
Long tasksno 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 sayrank on each leaderboard

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 attop three 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 itprices checked 1 Oct 2026

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

Released8 Apr 2026
Announcementabout.fb.com ↗
Release entryMuse Spark (proprietary; MSL)
Scored asMuse Spark
Artificial Analysis index–
Output speed–
Hugging Faceclosed weights

Meta releasesaround this one