Muse Spark Open

Language modelOpen weightsCard summarized

Built for coding and agentic work, Muse Spark Open is natively multimodal.

Source: Muse Spark Open model card (Hugging Face)

Use it via API

$878 /month

$17.55 per 1K requests · via Together AI

RAG over docs: 12K in · 600 out · 50K requests/mo · 30% cached · change

Code example Compare

Where to call it

Self-host (weights)meta-models/Muse-Spark-Open-816B-A42B
Together AImeta-models/muse-spark-open
Google Vertex AI—

Supports

Image input
Reasoning control
Tool calling
Fine-tuning

Full feature support

Good for

Multi-step reasoning across long, complex workflows
End-to-end agentic tasks: planning, sequential tool calls, failure recovery
Coding agents: writing, debugging and resolving real software tasks

Overview

Meta · 05Spark

Spark Open

Built for coding and agentic work, Muse Spark Open is natively multimodal.

Cost: $1.25 host
Context: 1M

Cheapest host: $1.25 / $4.25
Max output: —
Knows up to: —
Released: 15 Oct 2026

The open-weights release of Muse Spark: an 816B-total, 42B-active mixture-of-experts model with a 1M-token context, built for coding and agentic work and natively multimodal. Meta added extra safety post-training so it holds up as a standalone model without system guardrails, and says it met the release thresholds of its Superintelligence Scaling Framework. Meta does not say which Muse Spark version it matches. model card; research blog

meta-models/Muse-Spark-Open-816B-A42B

Input / output per 1M: $1.25 / $4.25 via Together AI
Context window: 1M
Max output: —
Knows up to: —
Reasoning: Reasoning effort low / medium / high / xhigh
Weights: Open · Muse Model License

About this card. A model card is the maker's own account of a model: what it's for, how it was trained and tested, and where it falls short. This page condenses Meta's Muse Spark Open model card (Hugging Face). Every claim carries its source page.