Grok 4.5 vs Muse Spark 1.2: Specs & Benchmark Comparison
Grok 4.5 is developed by xAI, while Muse Spark 1.2 comes from Meta. Grok 4.5 was released in July 2026, and Muse Spark 1.2 followed a month later in August 2026.
The two models share 2 published benchmarks. Muse Spark 1.2 leads on 1 of them. The widest gaps are on DeepSWE 1.1, where Muse Spark 1.2 scores 59.0% against 54.0%; Terminal-Bench 2.1, where Muse Spark 1.2 scores 83.0% against 83.0%. Averaged across everything we track, Grok 4.5 sits at 52.9% and Muse Spark 1.2 at 71.0%.
Muse Spark 1.2 is the cheaper API at $0.10 per million input tokens and $0.20 per million output tokens, roughly 20 times cheaper than Grok 4.5 at $2 and $6. Muse Spark 1.2 takes the larger context window at 1M tokens, compared with 500K for Grok 4.5. Both accept text and images as input.
| Characteristic | Grok 4.5 | Muse Spark 1.2 |
|---|---|---|
| Company | xAI | Meta |
| Release Date | July 16, 2026 | August 5, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 500K | 1.0M |
| Context (output) | — | 131K |
| Input Price / 1M | $2.00 | $0.10 |
| Output Price / 1M | $6.00 | $0.20 |
| Average Score | 52.9% | 71.0% |
| Benchmarks | ||
| DeepSWE 1.1 | 54.0% | 59.0% |
| Terminal-Bench 2.1 | 83.0% | 83.0% |
Visual Benchmark Comparison
Verdict
Muse Spark 1.2 leads in 3 out of 4 comparison categories.
Both models show comparable average scores: Grok 4.5 — 0.5, Muse Spark 1.2 — 0.7.
Muse Spark 1.2 is 26.7x cheaper: input $0.10/1M vs $2.00/1M tokens.
Muse Spark 1.2 supports a larger context: 1M vs 500K tokens.
Muse Spark 1.2 is newer: released 8/5/2026 vs 7/16/2026.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — Grok 4.5 or Muse Spark 1.2?
Which model is cheaper — Grok 4.5 or Muse Spark 1.2?
Which has a larger context window — Grok 4.5 or Muse Spark 1.2?
The Grok 4.5 and Muse Spark 1.2 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Grok 4.5 or Muse Spark 1.2 page. See also the complete list of AI model comparisons.