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Muse Spark 1.2 vs Seed 2.1 Pro

Muse Spark 1.2 and Seed 2.1 Pro are closely matched at 41.1 and 47.0 on the LLM Stats Score.

Meta · ByteDance · Updated for 2026

Which is better?

Muse Spark 1.2 and Seed 2.1 Pro are closely matched on the overall LLM Stats Score at 41.1 and 47.0.

In the 1 individual benchmarks reported for both models, Muse Spark 1.2 wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Muse Spark 1.2

  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Aug 2026

Choose Seed 2.1 Pro

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

Muse Spark 1.2
Meta
Seed 2.1 Pro
ByteDance
Core performance indexes
LLM Stats Score
41.1
#44
47.0
#20
Reasoning
34.4
#80
47.9
#18
Coding
33.3
#35
36.0
#25
Agents
29.3
#31
33.1
#22
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$0.10 / M
— / M
Output price
$0.20 / M
— / M
Context window
1,048,576
—

Individual benchmarks

3 reported for Muse Spark 1.2 · 94 for Seed 2.1 Pro

1 shared

Muse Spark 1.2 outperforms in 1 benchmarks (Terminal-Bench 2.1), while Seed 2.1 Pro is better at 0 benchmarks.

Muse Spark 1.2 significantly outperforms across most benchmarks.

Fri Aug 28 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Muse Spark 1.2 specifies input context (1,048,576 tokens). Only Muse Spark 1.2 specifies output context (131,072 tokens).

Meta
Muse Spark 1.2
Input1,048,576 tokens
Output131,072 tokens
ByteDance
Seed 2.1 Pro
Input- tokens
Output- tokens
Fri Aug 28 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Muse Spark 1.2 and Seed 2.1 Pro support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Muse Spark 1.2

Text
Images
Audio
Video

Seed 2.1 Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Muse Spark 1.2

Proprietary

Closed source

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark 1.2 was released on 2026-08-05, while Seed 2.1 Pro was released on 2026-06-24.

Muse Spark 1.2 is 1 month newer than Seed 2.1 Pro.

Muse Spark 1.2

Aug 5, 2026

3 weeks ago

1mo newer
Seed 2.1 Pro

Jun 24, 2026

2 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Muse Spark 1.2 and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

Muse Spark 1.2
✓ Preferred
Seed 2.1 Pro
Open in Playground

FAQ

Common questions about Muse Spark 1.2 vs Seed 2.1 Pro.

Which is better, Muse Spark 1.2 or Seed 2.1 Pro?

Muse Spark 1.2 and Seed 2.1 Pro are closely matched on the LLM Stats Score at 41.1 and 47.0. Muse Spark 1.2 is made by Meta and Seed 2.1 Pro is made by ByteDance. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Muse Spark 1.2 compare to Seed 2.1 Pro in benchmarks?

Muse Spark 1.2 scores Terminal-Bench 2.1: 82.9%, Meta Internal Coding Bench: 70.6%, DeepSWE 1.1: 59.3%. Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%.

What are the context window sizes for Muse Spark 1.2 and Seed 2.1 Pro?

Muse Spark 1.2 supports 1.0M tokens and Seed 2.1 Pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Muse Spark 1.2 and Seed 2.1 Pro?

Key differences include LLM Stats Score (41.1 vs 47.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Muse Spark 1.2 and Seed 2.1 Pro?

Muse Spark 1.2 is developed by Meta and Seed 2.1 Pro is developed by ByteDance.

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