Model Comparison
Grok 4.5 vs Muse Spark 1.1Which is better in 2026?
Grok 4.5 shows notably better performance in the majority of benchmarks. Muse Spark 1.1 is 1.5x cheaper per token.
Verdict: Grok 4.5 vs Muse Spark 1.1 — which is better?
Grok 4.5 (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 4.5 outperforms in 2 benchmarks (SWE-Bench Pro, Terminal-Bench 2.1), while Muse Spark 1.1 is better at 1 benchmark (DeepSWE 1.1). Grok 4.5 shows notably better performance in the majority of benchmarks.
On price, Muse Spark 1.1 is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Muse Spark 1.1 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Choose Grok 4.5 if…
- you want the strongest raw capability — it leads on 2 of 3 shared benchmarks
- you want the most recent training data — it shipped Jul 2026
Choose Muse Spark 1.1 if…
- cost matters — it's about 1.5x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
Performance Benchmarks
Comparative analysis across standard metrics
Grok 4.5 outperforms in 2 benchmarks (SWE-Bench Pro, Terminal-Bench 2.1), while Muse Spark 1.1 is better at 1 benchmark (DeepSWE 1.1).
Grok 4.5 shows notably better performance in the majority of benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Grok 4.5 ($2.00/1M tokens) is 1.6x more expensive than Muse Spark 1.1 ($1.25/1M tokens).
For output processing, Grok 4.5 ($6.00/1M tokens) is 1.4x more expensive than Muse Spark 1.1 ($4.25/1M tokens).
In conclusion, Grok 4.5 is more expensive than Muse Spark 1.1.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Muse Spark 1.1 accepts 1,048,576 input tokens compared to Grok 4.5's 500,000 tokens. Only Muse Spark 1.1 specifies output context (131,072 tokens).
Input Capabilities
Supported data types and modalities
Both Grok 4.5 and Muse Spark 1.1 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok 4.5
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
Grok 4.5 was released on 2026-07-16, while Muse Spark 1.1 was released on 2026-07-09.
Grok 4.5 is 0 month newer than Muse Spark 1.1.
Jul 16, 2026
2 days ago
1w newerJul 9, 2026
1 weeks ago
Knowledge Cutoff
When training data ends
Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while Muse Spark 1.1's cutoff date is not specified.
We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without Muse Spark 1.1's cutoff date.
Feb 2026
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Provider Availability
Grok 4.5 is available from xAI. Muse Spark 1.1 is available from Meta Model API.
Grok 4.5
Muse Spark 1.1
Outputs Comparison
Key Takeaways
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Grok 4.5 and Muse Spark 1.1 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Grok 4.5 vs Muse Spark 1.1.