Is Kimi K3 a good deal?

As of Sep 23, 2026, Kimi K3 is dominated for Balanced on LMArena. Muse Spark 1.3 scores 17.4 higher and costs 67% less, with a covering envelope. 13 of 136 rated, priced standard models are undominated.

Inspect model evidence Compare differences & requirements

Muse Spark 1.3 is both better and cheaper than Kimi K3: 17.4 points higher on LMArena and 67% less per million tokens, $4.00 cheaper at this mix.

Kimi K3 takes text, image, video, returns up to 943,718 tokens from a 1,048,576-token context, and is listed by 20 sellers. Open weights, so it can also be self-hosted.

Compared against 136 rated, priced models on this lens: 2 models dominate it and give up nothing, 5 more dominate it but give something up. Kimi K3 scores 1472.3 at $6.00 per million tokens for this mix.

Envelope-safe replacements

Each row scores at least as high, costs no more, and covers this model’s context, output, modalities, tools, and reasoning. A cheaper narrower model is not listed here.

Model	LMArena	Effective $/M	You save
Muse Spark 1.3	1489.7 +17.4	$2.00/M	67%
Muse Spark 1.1	1480.2 +7.9	$2.00/M	67%

Higher score, lower price, named losses

Not a drop-in. The loss is why these are not a recommendation.

Model	LMArena	Effective $/M	You give up
Gemini 3.8 Flash	1494.7	$1.50/M	max output
Gemini 3.7 Flash	1490.5	$1.50/M	max output
Gemini 3.1 Pro Preview	1480.1	$4.50/M	max output
Gemini 3.6 Flash	1476.1	$1.50/M	max output
Gemini 3.5 Flash	1475.7	$3.38/M	max output

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