# Kimi K3.1 Pro is now on Sail

> Source: <https://sailresearch.com/blog/kimi-k3-1-pro>
> Published: 2026-11-05 00:00:00+00:00

The beloved Kimi K3 just got an upgrade. On SWE-Marathon v1.1, which tests multi-hour coding tasks, K3.1 Pro scores 51.7%, up from K3’s 48.1%. Claude Opus 5.5 scores 46.3% and GPT-6 Astra scores 42.5% on the same benchmark.

Moonshot also reports 64.4 on OfficeQA Pro v2 for financial document analysis and 92.7 on BenchCAD with tools for CAD generation.[1](#fn-1)

Run Kimi K3.1 Pro on Sail Flex for $0.70 input, $0.10 cached input, and $6 output per million tokens.

Sail offers three pricing [tiers](https://docs.sailresearch.com/pricing#core-models):

| Tier | Input | Cached input | Output | 
|---|---|---|---|
| Flex | $0.70 | $0.10 | $6 | 
| Balanced | $1.20 | $0.15 | $8 | 
| ASAP | $1.50 | $0.20 | $10 | 

For 1M uncached input tokens and 1M output tokens, Sail Flex costs $6.70, compared with $12 for a typical direct API, about 44% less.[2](#fn-2)

[Start building with Kimi K3.1 Pro on Sail](https://app.sailresearch.com/sign-up) 

## Footnotes

1. Sources: [Vals](https://www.vals-ai.com/benchmarks/terminal-bench-4) (Terminal-Bench),[SWE-Marathon](https://www.swe-marathon.org/) (K3), and[Moonshot](https://www.kimi.ai/blog/kimi-k3-1-pro) (other results). BenchCAD: Voxel IoU, 1,000 files, with tools. Missing results shown as dashes.[↩](#fnref-1)
2. USD for 1M uncached input and 1M output tokens. Excludes tool charges. Direct API reference: $2 input and $10 output per million tokens. [↩](#fnref-2)