# Meta — Muse Spark Open

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## Model

- Name: Muse Spark Open
- Company: Meta (meta.com)
- Launch post: Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date — https://forck.live/items/22973-introducing-muse-spark-open-the-most-capable-us-open-weight-model-to-date
- Announced: 2026-10-15
- Launch source: https://research.meta.ai/blog/muse-spark-open
- Launch chosen by: the earliest dated release post naming it
- Released (per models.dev): not stated
- Listed (per OpenRouter): 2026-10-15
- Open weights: not stated
- Posts about it: 1
- Outlets named under its posts: 48
- OpenRouter id: meta/muse-spark-open — https://openrouter.ai/meta/muse-spark-open
- Licence: Muse Model License with limited commercial terms — from https://forck.live/items/22973-introducing-muse-spark-open-the-most-capable-us-open-weight-model-to-date
- Context window: 1M-token context window — from https://forck.live/items/22973-introducing-muse-spark-open-the-most-capable-us-open-weight-model-to-date

## Posts about it

_Meta's own posts whose title names Muse Spark Open, and its launch post, in the record's order: dated newest first, undated last. The record reads the newest 50 first-party posts mentioning the model, every company's together, so a model mentioned more often than that lists the newest of them._

Every entry is one first-party announcement, and carries the same eight fields
in this order before any others:

    Company · Announced · Category · Coverage · Announcement · Group · Source · Record

`Source` is the company's own page the announcement was traced to and `Record`
is this site's page for it. Both are safe to cite.

`Coverage` is a number of outlets, or `not counted` — which means this record
reached no count of its own, never that nobody wrote about it.

`Category` is this tracker's own analysis, and is authoritative wherever it is
stated. `not stated` means either that nothing has analysed the post yet or
that the analysis placed it outside this taxonomy; neither is a verdict about
the announcement.

`Announcement` is whether the post is news of something the company did, rather
than a how-to, a customer story, a changelog listing or a staffing note.

`Group` is which of this record's groups the entry falls in, carried on the
entry itself so it holds where the groups are headings and where they are not.
One of: `models`, `covered`, `announcements`, `routine`.

Anything after `Record` is held detail that only some announcements carry.

### Meta — Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date

- Company: Meta (meta.com)
- Announced: 2026-10-15
- Category: open-weight-release
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://research.meta.ai/blog/muse-spark-open
- Record: https://forck.live/items/22973-introducing-muse-spark-open-the-most-capable-us-open-weight-model-to-date
- Subject: Muse

Meta released the weights for Muse Spark Open, an 816B-parameter open-weight model with 42B active parameters and a 1M-token context window, optimized for coding and agentic tasks. The model is the first in its class to run on a desktop using two Apple M5 Ultra Mac Studios with the MLX framework, according to Meta. It is available through API platforms including Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter and Together AI, and weights can be downloaded from Hugging Face, Amazon SageMaker AI, Google Cloud Model Garden, and Microsoft Foundry Models. Meta says the model includes additional safety post-training and meets thresholds in its Superintelligence Scaling Framework for release.

## Who reported on it

_Outlets this record can name and link, under the first-party post each one covered. Their number is `Outlets named under its posts` above, and the rows are not totalled again. A post's own `Coverage` can be higher: it counts outlets the signal saw that this record cannot name and link._

### On: Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date

Record: https://forck.live/items/22973-introducing-muse-spark-open-the-most-capable-us-open-weight-model-to-date

- TestingCatalog — ICYMI: Meta's Muse Spark Open is optimized for new Mac Studio (2026-10-17T12:23:58+00:00): https://www.testingcatalog.com/icymi-metas-muse-spark-open-is-optimized-for-new-mac-studio/
- Computerworld — Apple’s big AI week ends with Mac + Muse AI supercomputers (2026-10-16T15:27:05+00:00): https://www.computerworld.com/article/4236527/apples-big-ai-week-ends-with-mac-muse-ai-supercomputers.html
- The Guardian — Meta releases Muse Spark Open, a new ‘open-weight’ AI model (2026-10-16T00:34:28+00:00): https://www.theguardian.com/technology/2026/oct/16/meta-releases-muse-spark-open-a-new-open-weight-ai-model
- SiliconANGLE — Meta releases 816B-parameter Muse Spark Open for coding and agent work (2026-10-15T22:20:54+00:00): https://siliconangle.com/2026/10/15/meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work/
- TechCrunch — Meta launches an open-weight AI model that runs on Macs (2026-10-15T20:04:53+00:00): https://techcrunch.com/2026/10/15/meta-launches-an-open-weight-model-that-runs-on-macs/
- Financial Times — Meta and Apple team up on AI model tailored for Mac computers (2026-10-15T20:00:23+00:00): https://www.ft.com/content/3568dbda-ac85-45b3-815a-3a8ec853a78d?syn-25a6b1a6=1
- 9to5Mac — Meta launches new Muse Spark Open model, optimized to run on Mac Studio: https://9to5mac.com/2026/10/15/meta-launches-new-muse-spark-open-model-optimized-to-run-on-mac-studio
- AppleInsider: https://appleinsider.com/articles/26/10/15/unlikely-apple-meta-team-up-brings-powerful-local-ai-to-mac-studio
- Blockchain News — Meta Muse Spark Open goes live on Together AI: https://blockchain.news/news/meta-muse-spark-open-goes-live-on-together-ai
- Business Today — Meta launches Muse Spark Open model to run on Mac Studio: How it can benefit users: https://businesstoday.in/technology/artificial-intelligence/story/meta-launches-muse-spark-open-model-to-run-on-mac-studio-how-it-can-benefit-users-562029-2026-10-16
- CNBC — Apple and Meta team up to make Muse AI model run on Mac computers: https://cnbc.com/2026/10/15/apple-meta-partner-ai.html
- CNET — Surprise! Meta and Apple Worked Together on a New Open-Source AI Model: https://cnet.com/tech/computing/meta-spark-open-ai-apple-news
- Constellation Research — Meta launches Muse Spark Open, may appeal to enterprises: https://constellationr.com/insights/news/meta-launches-muse-spark-open-may-appeal-enterprises
- Cult of Mac — Meta and Apple team up to bring powerful open-weight AI to Macs: https://cultofmac.com/news/meta-apple-muse-spark-open-weight-ai-mac
- Digit — Muse Spark Open: Open weights with a new model built for coding and AI agents: https://digit.in/features/general/muse-spark-open-open-weights-with-a-new-model-built-for-coding-and-ai-agents.html
- Digit — Meta and Apple team up to turn Mac Studios into an AI supercomputer: Check details: https://digit.in/news/general/meta-announces-muse-spark-open-a-multimodal-ai-that-can-run-on-apple-mac-studios-powered-by-m5-ultra.html
- Digital Trends: https://digitaltrends.com/computing/meta-releases-muse-spark-open-its-816b-open-weight-ai-model-for-apple-silicon
- en.wowtale.net — Meta Releases Open-Weight 'Muse Spark Open,' Optimized for Apple Mac Studio: https://en.wowtale.net/2026/10/17/235558
- Engadget — Meta built a huge open-weight AI model for Macs, but you'll need 1TB of RAM to run it: https://engadget.com/2287833/meta-built-a-huge-open-weight-ai-model-for-macs-but-youll-need-1tb-of-ram-to-run-it
- Fast Company: https://fastcompany.com/91624489/meta-and-apple-agree-on-at-least-one-thing-open-weight-ai-is-cool
- iClarified — Meta Releases Muse Spark Open AI Optimized for Mac Studio: https://iclarified.com/102861/meta-releases-muse-spark-open-ai-optimized-for-mac-studio
- Implicator — Meta's 816B Muse Spark Open Trails Chinese Rivals at Coding: https://implicator.ai/meta-releases-muse-spark-open-an-816b-model-that-trails-chinese-rivals-at-coding
- Indiatimes — Meta releases open-weight Muse Spark model for coding, agentic tasks - The Economic Times: https://economictimes.indiatimes.com/tech/technology/meta-releases-open-weight-muse-spark-model-for-coding-agentic-tasks/articleshow/134980613.cms
- iPhone in Canada — Apple and Meta Join Forces to Run Massive AI Model on the Mac: https://iphoneincanada.ca/2026/10/15/apple-and-meta-join-forces-to-run-massive-ai-model-on-the-mac
- Ithinkdiff — Meta and Apple Team Up to Run Muse Spark Open on Mac Studio: https://ithinkdiff.com/meta-apple-muse-spark-open-mac-studio
- MacDailyNews: https://macdailynews.com/2026/10/15/apple-and-meta-partner-to-run-massive-muse-ai-model-locally-on-mac-studios
- MacRumors — Meta and Apple Bring Muse Spark Open AI Model to Mac Studio: https://macrumors.com/2026/10/15/meta-muse-spark-open-mac-studio
- MacStories — Meta Releases Muse Spark Open, an Over 800 Billion Parameter Model That Can Run Locally on Multiple M5 Ultra Mac Studios: https://macstories.net/news/meta-releases-muse-spark-open-an-over-800-billion-parameter-model-that-can-run-locally-on-multiple-m5-ultra-mac-studios
- Macworld — No, Meta's Muse will not run on your Mac: https://macworld.com/article/3262041/no-metas-muse-will-not-run-on-your-mac.html
- Mashable — Apple and Meta team up on Muse Spark Open for Mac Studio: https://mashable.com/tech/apple-meta-muse-spark-open-mac-studio
- Moneycontrol — Meta launches Muse Spark Open AI model, claims it rivals top Chinese models: https://moneycontrol.com/technology/meta-launches-muse-spark-open-ai-model-claims-it-rivals-top-chinese-models-article-14053404.html
- Moneycontrol — “Runs great on new Mac Studios”: Zuckerberg on Meta’s Muse Spark Open AI model: https://moneycontrol.com/technology/runs-great-on-new-mac-studios-zuckerberg-on-meta-s-muse-spark-open-ai-model-article-14053566.html
- Neowin: https://neowin.net/news/metas-new-muse-spark-open-ai-needs-two-5499-mac-studios-to-run-on-desktop
- PYMNTS — Meta and Apple Bring Open-Weight Frontier Model to Desktops: https://pymnts.com/partnerships/2026/meta-and-apple-bring-open-weight-frontier-model-to-desktops
- Quartz: https://qz.com/meta-apple-muse-spark-open-mac-studio-101626
- Reuters: https://reuters.com/business/meta-releases-open-weight-muse-spark-model-coding-agentic-tasks-2026-10-15
- Silicon Republic — Meta unveils Muse Spark Open to compete with Chinese open weights: https://siliconrepublic.com/machines/meta-unveils-most-capable-us-open-weight-model-muse-spark-open
- SQ Magazine — Meta's Muse Spark Open Lands With Fine Print and a China Gap: https://sqmagazine.co.uk/meta-muse-spark-open-weight-model-license
- Tech Times — Muse Spark Open Runs on Two Mac Studios: Meta Breaks Data Center Barrier: https://techtimes.com/articles/329129/20261015/muse-spark-open-runs-two-mac-studios-meta-breaks-data-center-barrier.htm
- Techmymoney — Muse Spark Open: Meta's Two-Mac, Terabyte Setup: https://techmymoney.com/2026/10/15/meta-muse-spark-open-mac-studio
- Techstrong.ai — Meta, Apple Partner to Bring Massive 816B-Parameter Muse Spark Open AI Model to Desktop Macs: https://techstrong.ai/articles/meta-apple-partner-to-bring-massive-816b-parameter-muse-spark-open-ai-model-to-desktop-macs
- The Decoder — Muse Spark Open is Meta's answer to Qwen, GLM, and Kimi in the open-weight race: https://the-decoder.com/muse-spark-open-is-metas-answer-to-qwen-glm-and-kimi-in-the-open-weight-race
- The Economic Times — What is Meta’s Muse Spark Open and what can it do?: https://economictimes.indiatimes.com/tech/technology/what-is-metas-muse-spark-open-and-what-can-it-do/articleshow/134995861.cms
- The Independent — Meta launches new ‘open’ AI model – and it comes with a big surprise: https://the-independent.com/tech/meta-ai-open-weight-muse-spark-apple-b3068247.html
- The Neuron — Meta Muse Spark Open on Macs: Is Local AI Worth the Cost?: https://theneuron.ai/news/meta-muse-spark-open-macs-local-ai-cost
- The New Stack — Meta ships Muse Spark Open, its answer to China’s best open-weight models: https://thenewstack.io/meta-muse-spark-open
- The Verge — Meta and Apple team up to make Muse AI models run better on Macs: https://theverge.com/news/1012293/meta-apple-muse-spark-open-ai-model-mlx
- Unite — Meta’s 816B-Parameter Muse Spark Open Weights Are Now Public: https://unite.ai/metas-816b-parameter-muse-spark-open-weights-are-now-public
- VentureBeat: https://venturebeat.com/technology/meta-unveils-muse-spark-open-the-new-top-u-s-open-weights-model-and-it-runs-on-two-paired-mac-desktops
- Wall Street Journal — Meta and Apple, Longtime Foes, Team Up to Put Open-Weight AI on Macs: https://wsj.com/tech/ai/meta-and-apple-longtime-foes-team-up-to-put-open-weight-ai-on-macs-a28fde11
- Wccftech — Meta's Muse Spark Open Model Delivers A Throughput Of 20 Tokens/Sec On 2x Apple M5 Ultra Mac Studios: https://wccftech.com/metas-muse-spark-open-model-delivers-a-throughput-of-20-tokens-sec-on-2x-apple-m5-ultra-mac-studios

## Where it runs

_Other companies' own announcements naming Muse Spark Open and Meta — each is that company's post, not Meta's._

### AMD — Day 0 support is here for the first open weights model: Muse Spark Open.

- Company: AMD (amd.com)
- Announced: 2026-10-15T18:19:06+00:00
- Category: not stated
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://x.com/AIatAMD/status/2110797631089754565
- Record: https://forck.live/items/24200-day-0-support-is-here-for-the-first-open-weights-model-muse-spark-open

Muse Spark Open 🤝 AMD Instinct GPUs. Day 0 support is here for the first open weights model: Muse Spark Open. Start building 👇 https://t.co/ePbUh6utxf

### Amazon — Meta’s Muse Spark Open now available in Amazon SageMaker JumpStart

- Company: Amazon (amazon.com)
- Announced: 2026-10-15T17:43:35+00:00
- Category: availability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://aws.amazon.com/blogs/machine-learning/metas-muse-spark-open-now-available-in-amazon-sagemaker-jumpstart/
- Record: https://forck.live/items/23012-meta-s-muse-spark-open-now-available-in-amazon-sagemaker-jumpstart
- Subject: Bedrock / Nova

Amazon added Meta's Muse Spark Open, a coding-optimized open-weight model, to SageMaker JumpStart, letting customers deploy it on AWS infrastructure without managing servers. Meta trained the model on real developer workflows including multi-file refactors and long debugging sessions, and it supports a 1 million-token context window. SageMaker JumpStart offers two variants: BF16 and NVFP4 quantized, with the NVFP4 variant requiring roughly a quarter of the memory and running on ml.p5e.48xlarge instances. The endpoint runs in the customer's AWS account, giving them control over VPC, encryption, and scaling, and the model version is pinned until the customer redeploys.

### Baseten — Muse Spark Open, an open-weight model for coding agents

- Company: Baseten (baseten.co)
- Announced: 2026-10-15T17:27:04+00:00
- Category: open-weight-release
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://www.baseten.co/blog/muse-spark-open-launch
- Record: https://forck.live/items/23008-muse-spark-open-an-open-weight-model-for-coding-agents
- Subject: Baseten

Meta released the weights for Muse Spark Open, an 816B-parameter open-weight omnimodal MoE model co-trained with Muse Code for coding agent workflows. Its compressed MoE block and hybrid global/local attention cut inter-GPU traffic and KV cache memory for long agent sessions. The model accepts text, image, video and audio input with text output, enabling screenshot-driven UI debugging, video-to-test-case conversion and voice-driven pair programming. Muse Spark Open is available day 0 on Baseten Model APIs and Dedicated Inference, served in NVFP4.

### Together AI — Meta Muse Spark Open is live on Together AI

- Company: Together AI (together.ai)
- Announced: 2026-10-15
- Category: availability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://www.together.ai/blog/meta-muse-spark-open
- Record: https://forck.live/items/23053-meta-muse-spark-open-is-live-on-together-ai
- Subject: Inference platform

Together AI is offering Meta's open-weight Muse Spark Open model on its serverless and dedicated infrastructure, with a 1M-token context window for agentic coding workflows. The model is trained on real developer work including multi-file refactors and debugging, aiming for higher first-attempt accuracy and reliable tool calling. Early access customers Factory and Ollama evaluated the model before launch and are offering it to their users from day 0. Pricing is set at $1.25 per million input tokens, $4.25 per million output tokens, and $0.15 per million cached input tokens.

### Hugging Face — Welcome Muse Spark Open: open-weight frontier multimodal mixture-of-experts model from Meta

- Company: Hugging Face (huggingface.co)
- Announced: 2026-10-15
- Category: open-weight-release
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://huggingface.co/blog/meta-muse-spark-open
- Record: https://forck.live/items/23000-welcome-muse-spark-open-open-weight-frontier-multimodal-mixture-of-experts
- Subject: Platform

Meta released Muse Spark Open, an open-weight multimodal mixture-of-experts model with approximately 816 billion total parameters and about 42 billion active per token, supporting text, images, audio, and video input. The model is optimized for agentic coding tasks such as reading codebases, writing and debugging code, and calling tools, and can also process screenshots, voice notes, and screen recordings. It uses 256 experts per MoE block with 8 selected per token, and offers a context window of up to one million tokens. The BF16 checkpoint requires 4 nodes of 8 H200 GPUs, while an NVFP4 checkpoint runs on a single B200 node with negligible accuracy loss.

## Press chatter — a separate record, not announcements

This model's page lists 1 Press chatter entry naming Muse Spark Open: press coverage and discussion, not first-party announcements, so it is not in this file. Fetch https://forck.live/chatter.md for them, attribute every claim there to the outlet that made it, and never read an outlet count as confirmation.

---

Record: https://forck.live/models/muse-spark-open
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md