Kimi K3 vs Muse Spark 1.3: Specs & Benchmark Comparison
Kimi K3 is developed by Moonshot AI, while Muse Spark 1.3 comes from Meta. Kimi K3 was released in July 2026, and Muse Spark 1.3 followed 2 months later in September 2026. Kimi K3 has a published size of about 2.8 trillion 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 4 of them, Kimi K3 on 1. The widest gaps are on AutomationBench, where Muse Spark 1.3 scores 49.4% against 30.8%; Job Bench, where Muse Spark 1.3 scores 64.9% against 52.9%. Averaged across everything we track, Kimi K3 sits at 67.8% and Muse Spark 1.3 at 73.4%.
Muse Spark 1.3 is the cheaper API at $1.25 per million input tokens and $4.25 per million output tokens, roughly 2 times cheaper than Kimi K3 at $3 and $15. Both accept a context window of about 1M tokens. Kimi K3 accepts text and images as input, while Muse Spark 1.3 accepts text, images, audio, and video.
| Characteristic | Kimi K3 | Muse Spark 1.3 |
|---|---|---|
| Company | Moonshot AI | Meta |
| Release Date | July 16, 2026 | September 2, 2026 |
| Parameters | 2.8T | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 1.0M | 944K |
| Input Price / 1M | $3.00 | $1.25 |
| Output Price / 1M | $15.00 | $4.25 |
| Average Score | 67.8% | 73.4% |
| Benchmarks | ||
| AutomationBench | 30.8% | 49.4% |
| Job Bench | 52.9% | 64.9% |
| DeepSWE 1.1 | 69.0% | 75.4% |
| DeepSearchQA | 95.0% | 89.4% |
| Terminal-Bench 2.1 | 88.3% | 88.8% |
Visual Benchmark Comparison
Verdict
Muse Spark 1.3 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Kimi K3 — 0.7, Muse Spark 1.3 — 0.7.
Muse Spark 1.3 is 3.3x cheaper: input $1.25/1M vs $3.00/1M tokens.
Same context size: 1M tokens.
Muse Spark 1.3 is newer: released 9/2/2026 vs 7/16/2026.
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Frequently Asked Questions
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The Kimi K3 and Muse Spark 1.3 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Kimi K3 or Muse Spark 1.3 page. See also the complete list of AI model comparisons.