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Kimi K3 vs Kimi K3 Fast

Side by side

SpecKimi K3Kimi K3 Fast
Lowest input$0.60Wafer$4.50Inference.net
Lowest output$9.50Chutes$22.50Inference.net
Lowest cached input$0.185Chutes$0.45Inference.net
Context1.05M1.05M
Max output524K1.05M
Providers101
ReleasedJuly 16, 2026July 16, 2026
WeightsOpenOpen
LabMoonshot AIMoonshot AI
Model IDmoonshotai/kimi-k3moonshotai/kimi-k3-fast

USD per 1M tokens, as of November 5, 2026.

Price by provider

ProviderKimi K3Kimi K3 Fast
Inference.net$3.00 / $15.00$4.50 / $22.50
Chutes$1.85 / $9.50–
DeepInfra$2.85 / $14.25–
Doubleword$3.00 / $15.00–
Morph$2.50 / $14.00–
Nebius$3.00 / $15.00–
Novita AI$3.00 / $15.00–
Phala$3.00 / $15.00–
Sail Research$1.50 / $10.00–
Wafer$0.60 / $15.00–

Input / output, USD per 1M tokens.

Cost

Model1,000 chat replies2K in, 500 out each1,000 agent tasks50K in, 5K out eachMonthly batch job500M in, 50M out
Kimi K3Chutes$8.45$140.00$1,400.00
Kimi K3 FastInference.net$20.25$337.50$3,375.00

On each model's cheapest provider by input plus output list price.

FAQ

Which is cheaper, Kimi K3 or Kimi K3 Fast?

Input: Kimi K3 at $0.60 per million input tokens vs $4.50 (Kimi K3 Fast), 7.5x lower. Output: Kimi K3 at $9.50 per million output tokens vs $22.50 (Kimi K3 Fast), 2.4x lower. Lowest listed prices as of November 5, 2026.

Which has the longer context window?

Both list 1.05M tokens of context.

Which providers serve both Kimi K3 and Kimi K3 Fast?

1 provider serves both: Inference.net. Kimi K3 has 10 providers in total and Kimi K3 Fast has 1.

Do Kimi K3 and Kimi K3 Fast have cached input pricing?

Kimi K3 from $0.185 per million cached input tokens (Chutes). Kimi K3 Fast from $0.45 (Inference.net).

Can I switch between Kimi K3 and Kimi K3 Fast without changing code?

Yes. Both use the same OpenAI-compatible endpoint, https://api.routerplus.com/v1, and key. Change the model field from "moonshotai/kimi-k3" to "moonshotai/kimi-k3-fast".

All comparisons

Run Kimi K3 and Kimi K3 Fast on one key