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Grok 4 Fast vs Muse Spark 1.3

Muse Spark 1.3 leads the LLM Stats Score 55.3 to 32.0. Muse Spark 1.3 is 2.2x cheaper per token.

xAI · Meta · Updated for 2026

Which is better?

Muse Spark 1.3 leads the overall LLM Stats Score 55.3 to 32.0, ranking #5 overall.

On price, Muse Spark 1.3 is roughly 2.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok 4 Fast also accepts a larger context window (2,000,000 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 Grok 4 Fast

  • you process long inputs — it offers a 2,000,000 token context window

Choose Muse Spark 1.3

  • overall performance matters — it scores 55.3 and ranks #5 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • cost matters — it's about 2.2x cheaper per token
  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

Grok 4 Fast
xAI
Muse Spark 1.3
Meta
Core performance indexes
LLM Stats Score
32.0
#101
55.3
#5
Reasoning
31.1
#103
52.8
#7
Coding
18.3
#106
41.7
#10
Agents
3.7
#151
40.4
#4
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.20 / M
$0.10 / M
Output price
$0.50 / M
$0.20 / M
Context window
2,000,000
1,048,576

Individual benchmarks

7 reported for Grok 4 Fast · 11 for Muse Spark 1.3

No common benchmarks found

Grok 4 Fast 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

Pricing Analysis

Price comparison per million tokens

Muse Spark 1.3 costs less

For input processing, Grok 4 Fast ($0.20/1M tokens) is 2.0x more expensive than Muse Spark 1.3 ($0.10/1M tokens).

For output processing, Grok 4 Fast ($0.50/1M tokens) is 2.5x more expensive than Muse Spark 1.3 ($0.20/1M tokens).

In conclusion, Grok 4 Fast is more expensive than Muse Spark 1.3.*

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

Lowest available price from all providers
Fri Sep 04 2026 • llm-stats.com
xAI
Grok 4 Fast
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Meta
Muse Spark 1.3
Input tokens$0.10
Output tokens$0.20
Best providerMeta
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok 4 Fast accepts 2,000,000 input tokens compared to Muse Spark 1.3's 1,048,576 tokens. Muse Spark 1.3 can generate longer responses up to 943,718 tokens, while Grok 4 Fast is limited to 30,000 tokens.

xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Meta
Muse Spark 1.3
Input1,048,576 tokens
Output943,718 tokens
Fri Sep 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Grok 4 Fast and Muse Spark 1.3 support multimodal inputs.

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

Grok 4 Fast

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 4 Fast

Proprietary

Closed source

Muse Spark 1.3

Proprietary

Closed source

Release Timeline

When each model was launched

Grok 4 Fast was released on 2025-08-28, while Muse Spark 1.3 was released on 2026-09-02.

Muse Spark 1.3 is 12 months newer than Grok 4 Fast.

Grok 4 Fast

Aug 28, 2025

1.0 years ago

Muse Spark 1.3

Sep 2, 2026

2 days ago

1.0yr 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

Provider Availability

Grok 4 Fast is available from xAI. Muse Spark 1.3 is available from Meta Model API.

Grok 4 Fast

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M

Muse Spark 1.3

meta logo
Meta
Input Price:Input: $0.10/1MOutput Price:Output: $0.20/1M
* 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 Grok 4 Fast and Muse Spark 1.3 side-by-side, then vote on the output you prefer.

Grok 4 Fast
✓ Preferred
Muse Spark 1.3
Open in Playground

FAQ

Common questions about Grok 4 Fast vs Muse Spark 1.3.

Which is better, Grok 4 Fast or Muse Spark 1.3?

Muse Spark 1.3 leads the LLM Stats Score 55.3 to 32.0. Grok 4 Fast 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 4 Fast compare to Muse Spark 1.3 in benchmarks?

Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%. 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%.

Is Grok 4 Fast cheaper than Muse Spark 1.3?

Muse Spark 1.3 is 2.0x cheaper for input tokens. Grok 4 Fast costs $0.20/M input and $0.50/M output via xai. Muse Spark 1.3 costs $0.10/M input and $0.20/M output via meta.

What are the context window sizes for Grok 4 Fast and Muse Spark 1.3?

Grok 4 Fast supports 2.0M 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 4 Fast and Muse Spark 1.3?

Key differences include LLM Stats Score (32.0 vs 55.3), context window (2.0M vs 1.0M), input pricing ($0.20 vs $0.10/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4 Fast and Muse Spark 1.3?

Grok 4 Fast is developed by xAI and Muse Spark 1.3 is developed by Meta.

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