Model Comparison

Muse Spark 1.1 vs Grok 4.5Which is better in 2026?

Grok 4.5 shows notably better performance in the majority of benchmarks.

Verdict: Muse Spark 1.1 vs Grok 4.5 — which is better?

Muse Spark 1.1 (by Meta) and Grok 4.5 (by xAI) 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.

Muse Spark 1.1 outperforms in 1 benchmarks (DeepSWE 1.1), while Grok 4.5 is better at 2 benchmarks (SWE-Bench Pro, Terminal-Bench 2.1). Grok 4.5 shows notably better performance in the majority of benchmarks.

Choose Muse Spark 1.1 if…

  • you want the most recent training data — it shipped Jul 2026

Choose Grok 4.5 if…

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Muse Spark 1.1 outperforms in 1 benchmarks (DeepSWE 1.1), while Grok 4.5 is better at 2 benchmarks (SWE-Bench Pro, Terminal-Bench 2.1).

Grok 4.5 shows notably better performance in the majority of benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok 4.5 specifies input context (500,000 tokens).

Meta
Muse Spark 1.1
Input- tokens
Output- tokens
xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Muse Spark 1.1 and Grok 4.5 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

Grok 4.5

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

Grok 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark 1.1 was released on 2026-07-09, while Grok 4.5 was released on 2026-07-08.

Muse Spark 1.1 is 0 month newer than Grok 4.5.

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

1d newer
Grok 4.5

Jul 8, 2026

1 weeks 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→

Key Takeaways

Meta
Higher DeepSWE 1.1 score (53.3% vs 53.0%)
xAI
Larger context window (500,000 tokens)
Higher SWE-Bench Pro score (64.7% vs 61.5%)
Higher Terminal-Bench 2.1 score (83.3% vs 80.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Muse Spark 1.1 and Grok 4.5 side-by-side, then vote on the output you prefer.

Muse Spark 1.1
✓ Preferred
Grok 4.5
Open in Playground
AI Model Comparison Table
Feature
Meta
Muse Spark 1.1
xAI
Grok 4.5

FAQ

Common questions about Muse Spark 1.1 vs Grok 4.5.

Which is better, Muse Spark 1.1 or Grok 4.5?

Grok 4.5 shows notably better performance in the majority of benchmarks. Muse Spark 1.1 is made by Meta and Grok 4.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Muse Spark 1.1 compare to Grok 4.5 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%. Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%.

What are the context window sizes for Muse Spark 1.1 and Grok 4.5?

Muse Spark 1.1 supports an unknown number of tokens and Grok 4.5 supports 500K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Muse Spark 1.1 and Grok 4.5?

Muse Spark 1.1 is developed by Meta and Grok 4.5 is developed by xAI.

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