Muse Spark 1.3 vs Muse Spark Open: Specs & Benchmark Comparison
Muse Spark 1.3 and Muse Spark Open both come from Meta, Muse Spark 1.3 was released in September 2026, and Muse Spark Open followed a month later in October 2026. Muse Spark Open has a published size of about 816 billion parameters; Meta has not disclosed the parameter count of Muse Spark 1.3.
The two models share 5 published benchmarks. Muse Spark 1.3 leads on 5 of them. The widest gaps are on DeepSWE 1.1, where Muse Spark 1.3 scores 75.4% against 60.0%; Terminal-Bench 2.1, where Muse Spark 1.3 scores 88.8% against 76.4%. Averaged across everything we track, Muse Spark 1.3 sits at 73.4% and Muse Spark Open at 62.3%.
On price the two are close: Muse Spark 1.3 costs $1.25 per million input tokens and $4.25 per million output tokens, Muse Spark Open $1.25 and $4.25. Both accept a context window of about 1M tokens. Both accept text, images, audio, and video as input.
| Characteristic | Muse Spark 1.3 | Muse Spark Open |
|---|---|---|
| Company | Meta | Meta |
| Release Date | September 2, 2026 | October 15, 2026 |
| Parameters | — | 816B |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 944K | 1.0M |
| Input Price / 1M | $1.25 | $1.25 |
| Output Price / 1M | $4.25 | $4.25 |
| Average Score | 73.4% | 62.3% |
| Benchmarks | ||
| DeepSWE 1.1 | 75.4% | 60.0% |
| Terminal-Bench 2.1 | 88.8% | 76.4% |
| GDPval-AA | 58.5% | 46.7% |
| Job Bench | 64.9% | 61.8% |
| SWE Atlas - Codebase QnA | 59.4% | 58.0% |
Visual Benchmark Comparison
Verdict
Muse Spark Open leads in 1 out of 4 comparison categories.
Both models show comparable average scores: Muse Spark 1.3 — 0.7, Muse Spark Open — 0.6.
API cost is identical: input $1.25/1M, output $4.25/1M tokens.
Same context size: 1M tokens.
Muse Spark Open is newer: released 10/15/2026 vs 9/2/2026.
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Frequently Asked Questions
Which is better for coding — Muse Spark 1.3 or Muse Spark Open?
Which model is cheaper — Muse Spark 1.3 or Muse Spark Open?
Which has a larger context window — Muse Spark 1.3 or Muse Spark Open?
The Muse Spark 1.3 and Muse Spark Open comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Muse Spark 1.3 or Muse Spark Open page. See also the complete list of AI model comparisons.