The AI arena is free today

Open Superagent

Muse Spark 1.3 vs Seed 1.8

Muse Spark 1.3 leads the LLM Stats Score 55.1 to 34.2. Muse Spark 1.3 is 5.5x cheaper per token.

Meta · ByteDance · Updated for 2026

Which is better?

Muse Spark 1.3 leads the overall LLM Stats Score 55.1 to 34.2, ranking #4 overall.

On price, Muse Spark 1.3 is roughly 5.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Muse Spark 1.3 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

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

Choose Muse Spark 1.3

  • overall performance matters — it scores 55.1 and ranks #4 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • cost matters — it's about 5.5x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Sep 2026

Choose Seed 1.8

  • you want predictable pricing at $0.25/M input and $2.00/M output

At a glance

The differences that matter most.

Muse Spark 1.3
Meta
Seed 1.8
ByteDance
Core performance indexes
LLM Stats Score
55.1
#4
34.2
#91
Reasoning
52.6
#7
33.5
#93
Coding
41.9
#9
19.8
#99
Agents
40.6
#4
14.9
#86
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.10 / M
$0.25 / M
Output price
$0.20 / M
$2.00 / M
Context window
1,048,576
256,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Muse Spark 1.3
Seed 1.8
Tool use
35.8#2
6.6#142
Long context
31.9#1
19.7#32
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

11 reported for Muse Spark 1.3 · 57 for Seed 1.8

No common benchmarks found

Muse Spark 1.3 and Seed 1.8don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Muse Spark 1.3 costs less

For input processing, Muse Spark 1.3 ($0.10/1M tokens) is 2.5x cheaper than Seed 1.8 ($0.25/1M tokens).

For output processing, Muse Spark 1.3 ($0.20/1M tokens) is 10.0x cheaper than Seed 1.8 ($2.00/1M tokens).

In conclusion, Seed 1.8 is more expensive than Muse Spark 1.3.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Sep 09 2026 • llm-stats.com
Meta
Muse Spark 1.3
Input tokens$0.10
Output tokens$0.20
Best providerMeta
ByteDance
Seed 1.8
Input tokens$0.25
Output tokens$2.00
Best providerDeepinfra
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Muse Spark 1.3 accepts 1,048,576 input tokens compared to Seed 1.8's 256,000 tokens. Muse Spark 1.3 can generate longer responses up to 943,718 tokens, while Seed 1.8 is limited to 256,000 tokens.

Meta
Muse Spark 1.3
Input1,048,576 tokens
Output943,718 tokens
ByteDance
Seed 1.8
Input256,000 tokens
Output256,000 tokens
Wed Sep 09 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Muse Spark 1.3 and Seed 1.8 support multimodal inputs.

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

Muse Spark 1.3

Text
Images
Audio
Video

Seed 1.8

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 1.3

Proprietary

Closed source

Seed 1.8

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark 1.3 was released on 2026-09-02, while Seed 1.8 was released on 2026-02-17.

Muse Spark 1.3 is 7 months newer than Seed 1.8.

Muse Spark 1.3

Sep 2, 2026

6 days ago

6mo newer
Seed 1.8

Feb 17, 2026

6 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

Provider Availability

Muse Spark 1.3 is available from Meta Model API. Seed 1.8 is available from DeepInfra.

Muse Spark 1.3

meta logo
Meta
Input Price:Input: $0.10/1MOutput Price:Output: $0.20/1M

Seed 1.8

deepinfra logo
Deepinfra
Input Price:Input: $0.25/1MOutput Price:Output: $2.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Muse Spark 1.3 and Seed 1.8 side-by-side, then vote on the output you prefer.

Muse Spark 1.3
✓ Preferred
Seed 1.8
Open in Playground

FAQ

Common questions about Muse Spark 1.3 vs Seed 1.8.

Which is better, Muse Spark 1.3 or Seed 1.8?

Muse Spark 1.3 leads the LLM Stats Score 55.1 to 34.2. Muse Spark 1.3 is made by Meta and Seed 1.8 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 1.3 compare to Seed 1.8 in benchmarks?

Muse Spark 1.3 scores MRCR v2 (8-needle): 98.5%, MRCR v2 (8-needle, 512K-1M): 98.1%, DeepSearchQA: 89.4%, Terminal-Bench 2.1: 88.8%, DeepSWE 1.1: 75.4%. Seed 1.8 scores CountBench: 96.3%, AIME 2025: 94.3%, VLMsAreBlind: 93.0%, MMLU: 92.3%, AI2D: 89.1%.

Is Muse Spark 1.3 cheaper than Seed 1.8?

Muse Spark 1.3 is 2.5x cheaper for input tokens. Muse Spark 1.3 costs $0.10/M input and $0.20/M output via meta. Seed 1.8 costs $0.25/M input and $2.00/M output via deepinfra.

What are the context window sizes for Muse Spark 1.3 and Seed 1.8?

Muse Spark 1.3 supports 1.0M tokens and Seed 1.8 supports 256K 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 1.3 and Seed 1.8?

Key differences include LLM Stats Score (55.1 vs 34.2), context window (1.0M vs 256K), input pricing ($0.10 vs $0.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Muse Spark 1.3 and Seed 1.8?

Muse Spark 1.3 is developed by Meta and Seed 1.8 is developed by ByteDance.

Related comparisons