Model Comparison

Grok 4 Fast vs Muse Spark 1.1Which is better in 2026?

Muse Spark 1.1 significantly outperforms across most benchmarks. Grok 4 Fast is 7.3x cheaper per token.

Verdict: Grok 4 Fast vs Muse Spark 1.1 — which is better?

Grok 4 Fast (by xAI) and Muse Spark 1.1 (by Meta) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Grok 4 Fast outperforms in 0 benchmarks, while Muse Spark 1.1 is better at 1 benchmark (Humanity's Last Exam). Muse Spark 1.1 significantly outperforms across most benchmarks.

On price, Grok 4 Fast is roughly 7.3x 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.

Choose Grok 4 Fast if…

  • cost matters — it's about 7.3x cheaper per token
  • you process long inputs — it offers a 2,000,000 token context window

Choose Muse Spark 1.1 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok 4 Fast outperforms in 0 benchmarks, while Muse Spark 1.1 is better at 1 benchmark (Humanity's Last Exam).

Muse Spark 1.1 significantly outperforms across most benchmarks.

Tue Jul 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok 4 Fast costs less

For input processing, Grok 4 Fast ($0.20/1M tokens) is 6.3x cheaper than Muse Spark 1.1 ($1.25/1M tokens).

For output processing, Grok 4 Fast ($0.50/1M tokens) is 8.5x cheaper than Muse Spark 1.1 ($4.25/1M tokens).

In conclusion, Muse Spark 1.1 is more expensive than Grok 4 Fast.*

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

Lowest available price from all providers
Tue Jul 21 2026 • llm-stats.com
xAI
Grok 4 Fast
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Meta
Muse Spark 1.1
Input tokens$1.25
Output tokens$4.25
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 1.1's 1,048,576 tokens. Muse Spark 1.1 can generate longer responses up to 131,072 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 1.1
Input1,048,576 tokens
Output131,072 tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok 4 Fast and Muse Spark 1.1 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 1.1

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 1.1

Proprietary

Closed source

Release Timeline

When each model was launched

Grok 4 Fast was released on 2025-08-28, while Muse Spark 1.1 was released on 2026-07-09.

Muse Spark 1.1 is 11 months newer than Grok 4 Fast.

Grok 4 Fast

Aug 28, 2025

10 months ago

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

10mo 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 1.1 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 1.1

meta logo
Meta
Input Price:Input: $1.25/1MOutput Price:Output: $4.25/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

xAI
Larger context window (2,000,000 tokens)
Less expensive input tokens
Less expensive output tokens
Meta
Higher Humanity's Last Exam score (62.1% vs 20.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok 4 Fast and Muse Spark 1.1 side-by-side, then vote on the output you prefer.

Grok 4 Fast
✓ Preferred
Muse Spark 1.1
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok 4 Fast
Meta
Muse Spark 1.1

FAQ

Common questions about Grok 4 Fast vs Muse Spark 1.1.

Which is better, Grok 4 Fast or Muse Spark 1.1?

Muse Spark 1.1 significantly outperforms across most benchmarks. Grok 4 Fast is made by xAI and Muse Spark 1.1 is made by Meta. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok 4 Fast compare to Muse Spark 1.1 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 1.1 scores CharXiv-R: 88.4%, MCP Atlas: 88.1%, OSWorld-Verified: 80.8%, Terminal-Bench 2.1: 80.0%, BabyVision: 76.3%.

Is Grok 4 Fast cheaper than Muse Spark 1.1?

Grok 4 Fast is 6.3x cheaper for input tokens. Grok 4 Fast costs $0.20/M input and $0.50/M output via xai. Muse Spark 1.1 costs $1.25/M input and $4.25/M output via meta.

What are the context window sizes for Grok 4 Fast and Muse Spark 1.1?

Grok 4 Fast supports 2.0M tokens and Muse Spark 1.1 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 1.1?

Key differences include context window (2.0M vs 1.0M), input pricing ($0.20 vs $1.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4 Fast and Muse Spark 1.1?

Grok 4 Fast is developed by xAI and Muse Spark 1.1 is developed by Meta.

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