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lmarena.ai@lmarena_ai
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 🔗 View Quoted Tweet
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2111221323217412318
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/app/data/archive/2026/10/16/lmarena_ai/2111221323217412318/post.md
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---
tweet_id: "2111221323217412318"
author: "lmarena_ai"
published_at: "2026-10-16T22:22:42+00:00"
source_url: "https://x.com/arena/status/2111221323217412318"
---

Exciting news: Muse Spark Open (Max) by [@AIatMeta](https://x.com/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](https://x.com/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](https://x.com/AIatMeta) on this contribution to the open ecosystem!

![Tweet Image](https://pbs.twimg.com/media/HUyPTyfaQAAw7BY.jpg)

![AI at Meta](https://pbs.twimg.com/profile_images/2102933421458665472/o_KTIjw3_normal.png)

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

![Tweet Image](https://pbs.twimg.com/media/HUr8TsmbIAAT-m3.jpg)![Tweet Image](https://pbs.twimg.com/media/HUr8VZAbcAAF9yn.jpg)

[🔗 View Quoted Tweet](https://x.com/AIatMeta/status/2110779754274292212)