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Muse Spark 1.1 vs Seed 2.1 Pro

Muse Spark 1.1 leads the LLM Stats Score 51.0 to 47.0.

Meta · ByteDance · Updated for 2026

Which is better?

Muse Spark 1.1 leads the overall LLM Stats Score 51.0 to 47.0, ranking #12 overall.

In the 7 individual benchmarks reported for both models, Muse Spark 1.1 wins 7; 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 1.1

  • overall performance matters — it scores 51.0 and ranks #12 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 7 of 7 exact shared results
  • you want the most recent training data — it shipped Jul 2026

Choose Seed 2.1 Pro

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

Muse Spark 1.1
Meta
Seed 2.1 Pro
ByteDance
Core performance indexes
LLM Stats Score
51.0
#12
47.0
#20
Reasoning
51.5
#9
47.9
#18
Coding
37.3
#23
36.0
#25
Agents
37.0
#13
33.1
#22
Cost, coverage & limits
Benchmark wins
7 of 7
0 of 7
Input price
$1.25 / M
— / M
Output price
$4.25 / M
— / M
Context window
1,048,576
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Muse Spark 1.1
Seed 2.1 Pro
Vision
35.9#9
34.9#10
Tool use
32.7#7
27.9#17
Multimodal
33.9#11
37.7#5
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

11 reported for Muse Spark 1.1 · 94 for Seed 2.1 Pro

7 shared

Muse Spark 1.1 outperforms in 7 benchmarks (BabyVision, CharXiv-R, Humanity's Last Exam, MCP Atlas, SWE-Bench Pro, Terminal-Bench 2.1, Toolathlon), while Seed 2.1 Pro is better at 0 benchmarks.

Muse Spark 1.1 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 1.1 specifies input context (1,048,576 tokens). Only Muse Spark 1.1 specifies output context (131,072 tokens).

Meta
Muse Spark 1.1
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 1.1 and Seed 2.1 Pro support multimodal inputs.

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

Muse Spark 1.1

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 1.1

Proprietary

Closed source

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark 1.1 was released on 2026-07-09, while Seed 2.1 Pro was released on 2026-06-24.

Muse Spark 1.1 is 1 month newer than Seed 2.1 Pro.

Muse Spark 1.1

Jul 9, 2026

1 months ago

2w 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 1.1 and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

Muse Spark 1.1
✓ Preferred
Seed 2.1 Pro
Open in Playground

FAQ

Common questions about Muse Spark 1.1 vs Seed 2.1 Pro.

Which is better, Muse Spark 1.1 or Seed 2.1 Pro?

Muse Spark 1.1 leads the LLM Stats Score 51.0 to 47.0. Muse Spark 1.1 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 1.1 compare to Seed 2.1 Pro in benchmarks?

Muse Spark 1.1 scores CharXiv-R: 88.4%, MCP Atlas: 88.1%, OSWorld-Verified: 80.8%, Terminal-Bench 2.1: 80.0%, BabyVision: 76.3%. 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 1.1 and Seed 2.1 Pro?

Muse Spark 1.1 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 1.1 and Seed 2.1 Pro?

Key differences include LLM Stats Score (51.0 vs 47.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Muse Spark 1.1 and Seed 2.1 Pro?

Muse Spark 1.1 is developed by Meta and Seed 2.1 Pro is developed by ByteDance.

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