How much does Muse Spark Open cost?

Muse Spark Open costs $1.25 per 1 million input tokens and $4.25 per 1 million output tokens. This pricing is set by Meta.

What tokenizer does Muse Spark Open use?

Muse Spark Open uses the cl100k_base tokenizer. This tokenizer has a vocabulary of ~100,000 tokens and is widely used across many models.

What is Muse Spark Open's context window?

Muse Spark Open supports a context window of 1.0M tokens (1,048,576 tokens). The maximum output length is 16K tokens.

How does Muse Spark Open compare to other models?

You can compare Muse Spark Open's pricing and capabilities against other LLMs in the comparison table above, or visit the full pricing page for a side-by-side view of all models.

How do I count tokens for Muse Spark Open?

Use the token counter at the top of this page or visit the homepage calculator. Paste your text and it will show the exact token count and cost for Muse Spark Open using the cl100k_base tokenizer.

Muse Spark Open

Last verified October 17, 2026 · Meta pricing ↗

$1.25/1M input · $4.25/1M output · 1.0M context · Meta

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Alternatives to Muse Spark Open

Cheaper Alternative

Doubao Seed 2.1 Pro

$0.880 in · $4.41 out · ByteDance

4% cheaper

Premium Upgrade

GLM-5.3

$1.40 in · $4.40 out · Zhipu

Upgrade with 131K max output

Same Provider

Muse Spark 1.1

$1.25 in · $4.25 out · Meta

Higher tier in Meta ecosystem

Pricing Details

MetaOpen weights released October 15, 2026 under the Muse Model License (Muse Spark Open version). 816B total / ~42B active MoE, 256 experts per layer with 8 active. Text, image, video and audio in, text out. 1,048,576 context. Hugging Face: meta-models/Muse-Spark-Open-816B-A42B (BF16) and -NVFP4. PyTorch's launch post says it shares Muse Spark 1.3's base model with extra safety post-training for standalone use, so it is not the 1.3 weights. NOT ON META'S OWN MODEL API: dev.meta.ai/docs/models says self-host or use a third-party host. Price is the hosts' card, identical to the cent across Together, Fireworks, Baseten, Modal and Nebius (OpenRouter meta/muse-spark-open): $1.25 input, $0.15 cached input (Nebius lists no cache price), $4.25 output, which is closed Muse Spark 1.3's Standard card exactly. Fireworks serverless is a limited preview through October 29, 2026. Groq is enterprise preview with no public price. No Bedrock per-token listing; AWS sells it via SageMaker JumpStart per instance-hour. License: any company with over $20M gross revenue in 12 months must sign a separate agreement with Meta before offering it as a service; internal and product use are exempt; 'Built with Muse Spark Open' attribution required. Self-hosting: Meta says at least ~700GB GPU memory for NVFP4 and ~2TB for BF16; NVFP4 runs on 4x Blackwell Ultra or 8x H200. Max output not published by Meta (OpenRouter hosts list 943,718, Groq 131,072); 16,384 stored for parity with the Spark entries. Artificial Analysis Intelligence Index v4.3.2: 39 at xhigh, $0.84 per task, ~110M output tokens; Muse Spark 1.3 xhigh scores 45 at $1.37. Meta-reported (xhigh): Terminal-Bench 2.1 76.4, DeepSWE 1.1 60, GPQA Diamond 89.0, OSWorld Verified 80.4. Estimated tokens (different tokenizer).

Input / 1M tokens

$1.25

Output / 1M tokens

$4.25

Context Window

1.0M

Max Output

16K

Full Pricing Table Token Calculator

Price History

Launched at current price on 2026-10-15. No price changes recorded since.

Frequently Asked Questions

Common questions about Muse Spark Open pricing and usage