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Muse Spark Open ranks #1 US open model on Arena Code WebDev

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Arena says Muse Spark Open (Max), released by Meta, ranks #1 among US open models on its Code Arena WebDev leaderboard with 1511 points. It ranks #13 among all open models and scores 156 points above Muse Glimmer, which sits at #41. The post also lists pricing at $1.25 per 1M input tokens and $4.25 per 1M output tokens.

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The post gives the leaderboard rank, score gap to the earlier Muse Glimmer, and pricing, useful for comparing open coding models on WebDev tasks.

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Exciting news: Muse Spark Open (Max) by @AIatMeta is the #1 US open model in the Code Arena: WebDev! With 1511 pts, it’s #13 among open models overall.

As the first open-weight release in the Muse Spark family, it scored 156 pts above Muse Glimmer, @AIatMeta’s earlier open model at #41 among open models with 1355 pts.

Priced at $1.25/$4.25 per 1M input/output tokens, it’s 79% less than Muse Wonder (Max) and priced on par with Muse Spark 1.3 (Max).

By domain, Muse Spark Open (Max) ranks:
- #13 in Brand & Marketing, and in Data & Analytics
- #14 in Reference-Based Design
- #15 Gaming, and in Consumer Product
- #20 in Simulations

Congrats to the team at @AIatMeta on this contribution to the open ecosystem!

AI at Meta@AIatMeta
Today we’re releasing Muse Spark Open, the most capable US open-weight model to date. Built for coding and agentic work, it excels at long-horizon tasks, complex software engineering, and multi-step reasoning. Key Model Specs: → 816B total / 42B active parameters → 1M token context window → Natively multimodal across text, image, video, audio
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Source: Arena.ai · x.comPublished · added here

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