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Grok-1.5 vs Muse Spark 1.3

Muse Spark 1.3 leads the LLM Stats Score 55.4 to -2.4.

xAI · Meta · Updated for 2026

Which is better?

Muse Spark 1.3 leads the overall LLM Stats Score 55.4 to -2.4, ranking #5 overall.

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

Choose Grok-1.5

  • you are already invested in the xAI ecosystem

Choose Muse Spark 1.3

  • overall performance matters — it scores 55.4 and ranks #5 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

Grok-1.5
xAI
Muse Spark 1.3
Meta
Core performance indexes
LLM Stats Score
-2.4
#327
55.4
#5
Reasoning
-1.9
#317
53.0
#6
Coding
-0.8
#236
41.6
#9
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$0.10 / M
Output price
— / M
$0.20 / M
Context window
—
1,048,576

Individual benchmarks

9 reported for Grok-1.5 · 11 for Muse Spark 1.3

No common benchmarks found

Grok-1.5 and Muse Spark 1.3don'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

Context Window

Maximum input and output token capacity

Only Muse Spark 1.3 specifies input context (1,048,576 tokens). Only Muse Spark 1.3 specifies output context (943,718 tokens).

xAI
Grok-1.5
Input- tokens
Output- tokens
Meta
Muse Spark 1.3
Input1,048,576 tokens
Output943,718 tokens
Thu Sep 03 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Muse Spark 1.3 supports multimodal inputs, whereas Grok-1.5 does not.

Muse Spark 1.3 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-1.5

Text
Images
Audio
Video

Muse Spark 1.3

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.

Grok-1.5

Proprietary

Closed source

Muse Spark 1.3

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Muse Spark 1.3 was released on 2026-09-02.

Muse Spark 1.3 is 30 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.4 years ago

Muse Spark 1.3

Sep 2, 2026

0 days ago

2.4yr newer

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 Grok-1.5 and Muse Spark 1.3 side-by-side, then vote on the output you prefer.

Grok-1.5
✓ Preferred
Muse Spark 1.3
Open in Playground

FAQ

Common questions about Grok-1.5 vs Muse Spark 1.3.

Which is better, Grok-1.5 or Muse Spark 1.3?

Muse Spark 1.3 leads the LLM Stats Score 55.4 to -2.4. Grok-1.5 is made by xAI and Muse Spark 1.3 is made by Meta. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok-1.5 compare to Muse Spark 1.3 in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. 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%.

What are the context window sizes for Grok-1.5 and Muse Spark 1.3?

Grok-1.5 supports an unknown number of tokens and Muse Spark 1.3 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-1.5 and Muse Spark 1.3?

Key differences include LLM Stats Score (-2.4 vs 55.4), multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-1.5 and Muse Spark 1.3?

Grok-1.5 is developed by xAI and Muse Spark 1.3 is developed by Meta.

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