Model Comparison
Grok-4 Heavy vs Muse Spark 1.1Which is better in 2026?
Muse Spark 1.1 significantly outperforms across most benchmarks.
Verdict: Grok-4 Heavy vs Muse Spark 1.1 — which is better?
Grok-4 Heavy (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 Heavy 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.
Choose Grok-4 Heavy if…
- you are already invested in the xAI ecosystem
Choose Muse Spark 1.1 if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
Performance Benchmarks
Comparative analysis across standard metrics
Grok-4 Heavy 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.
Arena Performance
Human preference votes
Context Window
Maximum input and output token capacity
Only Muse Spark 1.1 specifies input context (1,048,576 tokens). Only Muse Spark 1.1 specifies output context (131,072 tokens).
Input Capabilities
Supported data types and modalities
Both Grok-4 Heavy and Muse Spark 1.1 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-4 Heavy
Muse Spark 1.1
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Muse Spark 1.1 was released on 2026-07-09, while Grok-4 Heavy's release date is not specified.
We can confirm Muse Spark 1.1's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
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Jul 9, 2026
1 weeks ago
Knowledge Cutoff
When training data ends
Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Muse Spark 1.1's cutoff date is not specified.
We can confirm Grok-4 Heavy's training data extends to 2024-12-31, but cannot make a direct comparison without Muse Spark 1.1's cutoff date.
Dec 2024
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Outputs Comparison
Key Takeaways
No standout differentiators in the data we have for this pair.
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Grok-4 Heavy and Muse Spark 1.1 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Grok-4 Heavy vs Muse Spark 1.1.