Kimi K3 vs Muse Spark 1.1
Kimi K3 wins on Overall, Coding, Multimodal. Every numeric field is compared below, with a worked monthly-cost example and a pick rule for each use case.
Verdict at a glance
Choose Kimi K3 if you…
- Best-in-class long text
- Open-source and self-hostable
- Strong codebase understanding
- Fair price
- Best for: Long-document reading, Codebase analysis, Chinese
Choose Muse Spark 1.1 if you…
- Completely free open weights
- By Meta
- Self-hostable
- Multimodal
- Best for: Open research, Local deployment, Experimental
Head-to-head aggregate scores
Scores are 0–100, aggregated from public benchmark information and independently weighted across three leaderboards. Rank is out of 22 tracked models.
Aggregated from public sources and independently weighted; methodology on the Terms page. Scores within 3 points are treated as statistically tied.
Specs & pricing — every field side by side
List API prices in USD per 1M tokens. The highlighted cell is the stronger value/capability on that row.
| Dimension | Kimi K3 | Muse Spark 1.1 | Verdict |
|---|---|---|---|
| Vendor | Moonshot AI (CN) | Meta (US) | Different vendors |
| Released | 2026.06 | 2026.08 | Muse Spark 1.1 is newer |
| Overall (rank) | 77 · #8 | 61 · #22 | Kimi K3 +16 |
| Coding | 71 · #11 | 59 · #21 | Kimi K3 +12 |
| Multimodal | 81 · #10 | 75 · #15 | Kimi K3 +6 |
| Context window | 256K | 256K | Tie |
| Max output | 64K | 64K | Tie |
| Effective-context | 99 | 80 | Kimi K3 more reliable |
| Input $/1M | $3 | Free | Muse Spark 1.1 cheaper |
| Output $/1M | $15 | Free | Muse Spark 1.1 cheaper |
| Cache discount | custom | none | Muse Spark 1.1 deeper |
| Speed | ~45 tok/s | Hardware-dependent | Kimi K3 faster |
| TTFT | 0.7s | Hardware-dependent | Kimi K3 snappier |
| Function calling | 80 | 65 | Kimi K3 ahead |
| Refusal rate | ~6% | ~4% | Muse Spark 1.1 less restrictive |
| English | 75 | 78 | Muse Spark 1.1 |
| Chinese | 92 | 60 | Kimi K3 |
| Modalities | text, image | text, image | Same |
| Open weights | Yes | Yes | Both open |
| Fine-tuning | No | Yes | |
| Free tier | Kimi App free; free quota on the open platform | Fully free (model weights) | |
| SOC2 / no-train | no / yes | no / yes | |
| Private deployment | Yes | Yes | Both support it |
Fields drawn from vendor public documentation and the Modelspectra 22-model dataset; speed varies with network, concurrency and prompt length. Verify current pricing before purchase.
Dimension-by-dimension analysis
Reasoning & overall intelligence
Kimi K3 leads the overall aggregate by 16 points (77 vs 61). That is a meaningful, not marginal, edge on hard, multi-step reasoning, while Muse Spark 1.1 remains a strong generalist that is not out of its depth on routine work.
Agentic coding
This is a clear gap: Kimi K3 scores 71 against 59. On multi-file edits, SWE-style tickets and long-horizon agent loops Kimi K3 needs fewer correction turns; Muse Spark 1.1 is still competent for scripts and assisted completion but trails as task complexity rises.
Multimodal
Kimi K3 leads multimodal 81 vs 75. Neither emits native video, so the comparison is about parsing images and documents, not generation.
Speed & latency
Muse Spark 1.1 is self-hosted, so its speed depends on your hardware; against a managed API like Kimi K3 (~45 tok/s, 0.7s TTFT) compare on your own infrastructure before assuming latency.
Context: window vs usable recall
Nominal windows are 256K for Kimi K3 and 256K for Muse Spark 1.1. Effective-context scores point the same way as window size — Kimi K3 is ahead on usable recall (99 vs 80), so prefer it for long-document work where details cannot be missed.
Price & total cost
Muse Spark 1.1 is free open weights (you pay only for the infrastructure you run it on), while Kimi K3 is a paid API at $3/$15 per 1M tokens. The real comparison is total cost of ownership — GPU/ops against a managed bill — not list price alone.
Chinese vs English
English: Kimi K3 75 vs Muse Spark 1.1 78. Chinese: 92 vs 60. For Chinese-language production, Kimi K3 is the stronger pick. Note that non-Chinese models generally require overseas network access for their APIs.
Tool use & ecosystem
Function-calling score: Kimi K3 80 vs Muse Spark 1.1 65, so Kimi K3 has the edge on structured tool use. Fine-tuning is available from Muse Spark 1.1. Factor in existing SDK/plugin familiarity — switching cost often outweighs a few-point tool-use gap.
Cost worked example — same workload, real token math
Assume a production workload of 100M input + 30M output tokens per month, with 90% of input tokens served from cache. Figures use public list prices.
Illustrative model; your input/output mix and cache-hit ratio change the result. Prices are list rates before any enterprise agreement.