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% and ahead of Claude Opus 5.5’s 46.3% and GPT-6 Astra’s 42.5%.
Moonshot also reports 64.4 on OfficeQA Pro v2 for financial document analysis and 92.7 on BenchCAD with tools for CAD generation.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:
| 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
Start building with Kimi K3.1 Pro on Sail
Footnotes
- Sources: Vals (Terminal-Bench), SWE-Marathon (K3), and Moonshot (other results). BenchCAD: Voxel IoU, 1,000 files, with tools. Missing results shown as dashes. ↩
- USD for 1M uncached input and 1M output tokens. Excludes tool charges. Direct API reference: $2 input and $10 output per million tokens. ↩