> Kimi K3 vs Muse Spark 1.3: index scores 172 and 170 (GPT-4 = 100), API prices, context windows and results on the same independent tests, side by side.

Up to four models

# Compare

Side by side on the same independent tests, with price and context. The link in your address bar shares this exact comparison.

[Kimi K3](https://themodelindex.org/models/kimi-k3/)

[Muse Spark 1.3](https://themodelindex.org/models/muse-spark-1-3/)

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Next to Kimi K3

Cheapest at this level

MiMo-V2.6-Pro

Best closed model, measured

Claude Opus 5.5

Closest rival, another lab

Qwen3.8-2.4T-A95B

The version it replaced

Kimi K2.6

Where it started

GPT-4

Presets

Best open vs best closed (measured)

Today vs GPT-4 (2023)

Top three labs

US vs China, best of each

[Kimi K3](https://themodelindex.org/models/kimi-k3/)

172

161–183

Weights

Open

Released

Jul 2026

Price in / out

$0.35 / $10

Context

1.05M

Core tests taken

4 of 8

[Muse Spark 1.3](https://themodelindex.org/models/muse-spark-1-3/)

170

159–182

Weights

Closed

Released

Sep 2026

Price in / out

$1.25 / $4.25

Context

1.05M

Core tests taken

2 of 8

Kimi K3 and Muse Spark 1.3 are too close to call (2 points apart, within the uncertainty), ahead on 0 of 2 shared core tests, at 1.4× the price.

## Test by test · independent results · Epoch AI

Kimi K3

Muse Spark 1.3

_Chart: Test results for the selected models_

Only tests that at least two of these models have taken. Bold rows are the core tests shown on every profile; all of these results inform the index score. Task length (METR) is listed below the chart because it is a duration, not a percentage.

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Source: https://themodelindex.org/compare/kimi-k3-vs-muse-spark-1-3/ · The Model Index · data as of 2026-10-02