Self-hosting and data control
Choose Muse Spark Open
Muse Spark Open has open weights, so you can run it on your own servers; Kimi K3.1 Pro is only available through its provider.
Kimi K3.1 Pro vs Muse Spark Open: price, context and capabilities
Choose Kimi K3.1 Pro for images as input and the latest release. Choose Muse Spark Open for self-hosting and data control.
In short
- A price comparison is not possible: one of them has no comparable published price.
- Only Kimi K3.1 Pro offers vision, structured output, prompt caching.
- Only Muse Spark Open offers self-hostable.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Images as input
Choose Kimi K3.1 Pro
Kimi K3.1 Pro accepts images as input; Muse Spark Open does not.
Latest release
Choose Kimi K3.1 Pro
Kimi K3.1 Pro is the newer release (Oct 23, 2026, against Oct 15, 2026 for Muse Spark Open).
Specifications side by side
| Kimi K3.1 Pro | Muse Spark Open | |
|---|---|---|
| Provider | Moonshot AI | Meta |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $4.00 / 1M tokens | No data |
| Input | $2.00 / 1M tokens | No data |
| Output | $10.00 / 1M tokens | No data |
| Cached input | $0.20 / 1M tokens | No data |
| Context window | 1.05M | No data |
| Max output | 944k | No data |
| Released | Oct 23, 2026 | Oct 15, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Open weights |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching | Reasoning, Tool calling, Self-hostable |
| API model id | kimi-k3.1-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | Kimi K3.1 Pro | Muse Spark Open |
|---|---|---|
| Intelligence Index | No data | 38.9 |
| SciCode | No data | 58.4% |
| GPQA Diamond | No data | 89% |
| Humanity's Last Exam | No data | 43.9% |
| MMMU-Pro (visual reasoning) | No data | 80.9% |
| Long-context reasoning (AA-LCR) | No data | 78.3% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Kimi K3.1 Pro or Muse Spark Open?
Choose Kimi K3.1 Pro for images as input and the latest release. Choose Muse Spark Open for self-hosting and data control.
Which is cheaper, Kimi K3.1 Pro or Muse Spark Open?
A price comparison is not possible: one of them has no comparable published price.
What is the difference between Kimi K3.1 Pro and Muse Spark Open?
Kimi K3.1 Pro is made by Moonshot AI and Muse Spark Open by Meta. A price comparison is not possible: one of them has no comparable published price. Only Kimi K3.1 Pro offers vision, structured output, prompt caching. Only Muse Spark Open offers self-hostable.
Which is newer, Kimi K3.1 Pro or Muse Spark Open?
Kimi K3.1 Pro was released on Oct 23, 2026 and Muse Spark Open on Oct 15, 2026.