Kimi K3.1 Pro vs Muse Spark 1.3 Max: which is faster?

This comparison puts Kimi's Kimi K3.1 Pro next to Meta's Muse Spark 1.3 (Max). Muse Spark 1.3 Max streams output at about 140 tokens per second, 5.2 times the rate of Kimi K3.1 Pro. No hands-on testing went into this write-up; it summarises the recorded benchmark, price and speed data for both models.

Muse Spark 1.3 Max is the faster writer

Kimi K3.1 Pro generates about 27 tokens per second and Muse Spark 1.3 Max about 140 tokens per second. On outputs beyond about 1,100 tokens, that is a real advantage for Muse Spark 1.3 Max. The wait for the first token averages 3.0 seconds on Kimi K3.1 Pro against 36 seconds on Muse Spark 1.3 Max. So the two pull in opposite directions, with Kimi K3.1 Pro quicker off the mark and Muse Spark 1.3 Max quicker once it gets going; the crossover is around 1,100 tokens. A first-token wait of that length suits background work better than live conversation.

Add the two numbers up for a 2,000-token reply and Muse Spark 1.3 Max finishes first: 77 seconds for Kimi K3.1 Pro, 50 seconds for Muse Spark 1.3 Max.

Token pricing and a sample bill

Per million tokens, Kimi K3.1 Pro charges $2.00 for input and $10.00 for output, while Muse Spark 1.3 Max charges $1.25 and $4.25. Kimi K3.1 Pro costs 2.4 times as much per output token.

For a sample workload of 1 million input tokens and 200,000 output tokens, Kimi K3.1 Pro would cost $4.00 and Muse Spark 1.3 Max $2.10, a difference of $1.90. A bigger example, classifying 100,000 short messages at 150 input tokens and 5 output tokens each, costs $35.00 on Kimi K3.1 Pro and $20.88 on Muse Spark 1.3 Max: a gap of $14.13. Blended at three input tokens per output token, the effective rates are $4.00 for Kimi K3.1 Pro and $2.00 for Muse Spark 1.3 Max.

When they came out

The release dates are September 2, 2026 for Muse Spark 1.3 Max and October 23, 2026 for Kimi K3.1 Pro, about 2 months apart.

Reasoning and overall scores

Kimi K3.1 Pro records 46.5 on the intelligence index and Muse Spark 1.3 Max records 36.6. A difference this size usually separates one tier of model from the next. Put another way, Muse Spark 1.3 Max would need 27% more on this index to draw level.

For context, that places Kimi K3.1 Pro 23rd and Muse Spark 1.3 Max 36th out of 109 scored models still on offer.

The catalogue does not yet split either model's score into coding and math indexes.

Score per dollar

Dividing the blended price by the intelligence index gives a rough cost per point: $0.086 for Kimi K3.1 Pro and $0.055 for Muse Spark 1.3 Max, per million tokens. Muse Spark 1.3 Max delivers each index point for 36% less; whether Kimi K3.1 Pro's extra 9.9 points are worth the premium depends on how often your tasks need them.