Kimi K3.1 Pro is now on Sail

Moonshot's Kimi K3.1 Pro is now available on Sail, scoring 51.7% on SWE-Marathon v1.1 for multi-hour coding tasks, up from Kimi K3's 48.1% and ahead of Claude Opus 5.5 at 46.3% and GPT-6 Astra at 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. Sail prices Kimi K3.1 Pro on its Flex tier at $0.70 per million input tokens, $0.10 cached input and $6 output, making 1M uncached input plus 1M output tokens cost $6.70 versus $12 for a typical direct API, about 44% less.

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