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Comparison · 2 models · Updated Nov 2, 2026

Muse Spark Open vs Kimi K3

Muse Spark Open comes out ahead, 68 to 65 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Meta

    Muse Spark Open

    Released Oct 15, 2026New

    68/100
    • ECI155.1
    • Price$1.25 / $4.25
    • Context1.05M
    Full specs Remove Muse Spark Open

  2. Moonshot AI

    Kimi K3

    Released Jul 16, 2026

    65/100
    • ECI158.3
    • Price$3.00 / $15.00
    • Context1.05M
    Full specs Remove Kimi K3

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Muse Spark Open is our pick

Muse Spark Open is the better all-round choice, scoring 68/100 against Kimi K3 (65). It leads on price. Kimi K3 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityKimi K3Capabilities Index (ECI): Kimi K3 158.3 · Muse Spark Open 155.1
  • Lowest priceMuse Spark OpenMuse Spark Open $2.00 · Kimi K3 $6.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameMuse Spark Open 1,048,576 · Kimi K3 1,048,576 tokens
  • Widest inputsMuse Spark OpenMuse Spark Open: Text, Images, Audio, Video · Kimi K3: Text, Images, Video
  • Self-hostingAll open weightsEvery model here can be downloaded and run on your own hardware
How the score is built
MeasureWeightMuse Spark OpenKimi K3
CapabilityCapabilities Index (ECI)50%8387
Price25%3412
Inputs & features15%8080
Context window10%6161
Overall100%68/10065/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Muse Spark Open vs Kimi K3 specifications side by side
SpecificationMuse Spark OpenMetaKimi K3Moonshot AI
Capability
Capabilities Index (ECI)155.1158.3 (best)
ECI rank#39 of 165#20 of 165 (best)
GPQA DiamondGraduate-level science questions88.6%93.1% (best)
FrontierMath Tiers 1–3Research-level mathematics69.8%72.2% (best)
OTIS Mock AIME 2024–2025Competition mathematics98.1% (best)97.2%
SimpleQA VerifiedShort factual questions56.6% (best)50.6%
Price per million tokens
Input$1.25 (best)$3.00
Output$4.25 (best)$15.00
Cached input—$0.30
Blended (3:1)$2.00 (best)$6.00
Long-context rateSame rateSame rate
Price sourceMedian of 16 providersOfficial Moonshot AI API
Limits
Context window1,048,576 tokens1,048,576 tokens
Max output131,072 tokens131,072 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoNo
AudioYesNo
VideoYesYes
ReasoningYesYeslow · high · max
Tool callingYesYes
Structured outputNoYes
Availability
WeightsOpenMuse Model LicenseOpen
API model ID—kimi-k3
API providers1676 (best)
ReleasedOct 15, 2026Jul 16, 2026
Knowledge cutoffJan 4, 2026—
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Muse Spark Open$21.00
  • Kimi K3$60.00
04 — Questions

Which should you choose?

Which is better: Muse Spark Open or Kimi K3?

Muse Spark Open is the better all-round choice, scoring 68/100 against Kimi K3 (65). It leads on price. Kimi K3 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Muse Spark Open or Kimi K3?

Muse Spark Open is cheaper at $1.25 input / $4.25 output per million tokens (median across 16 API providers). Kimi K3 costs $3.00 input / $15.00 output per million tokens (official Moonshot AI API price). At a typical mix of three input tokens to one output token, that is $2.00 per million tokens for Muse Spark Open versus $6.00 for Kimi K3 (3× as much).

Which scores higher on benchmarks?

Kimi K3 scores higher on the Capabilities Index (ECI): Kimi K3 158.3 (#20 of 165) and Muse Spark Open 155.1 (#39 of 165). The confidence ranges of the top two overlap (155.8–161.4 vs 153.1–157.3), so treat the gap as small. On individual benchmarks: GPQA Diamond — Kimi K3 93.1%, Muse Spark Open 88.6%; FrontierMath Tiers 1–3 — Kimi K3 72.2%, Muse Spark Open 69.8%; OTIS Mock AIME 2024–2025 — Muse Spark Open 98.1%, Kimi K3 97.2%; SimpleQA Verified — Muse Spark Open 56.6%, Kimi K3 50.6%.

Which is better for coding?

There are no published SWE-bench Verified results for Muse Spark Open and Kimi K3 yet, so there is no like-for-like coding score. On overall capability, Kimi K3 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Muse Spark Open and Kimi K3 share the same 1,048,576-token context window. Maximum output per response: Muse Spark Open up to 131,072, Kimi K3 up to 131,072 tokens.

Which can read images, PDFs, audio or video?

Muse Spark Open accepts text, images, audio and video; Kimi K3 accepts text, images and video. Muse Spark Open handles the widest range of inputs.

Are any of these open source?

Yes, both publish their weights (Muse Model License), so you can self-host them.

Which is newer?

Muse Spark Open is the newest, released Oct 15, 2026. Kimi K3 came out Jul 16, 2026. Knowledge cutoff: Muse Spark Open Jan 4, 2026.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.

05 — Keep comparing

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