Kimi K3.1 Pro, the first model in the Kimi K3 series from Moonshot AI, released 2026-10-23 — a post-trained version of K3 billed as the company's most capable 3T-class open-weight model to date: **2.8T total / 104B active** parameters, a **1,048,576-token (1M) context window** and native multimodality (text/image/video). Release evaluations: Terminal-Bench 4.0 **65.7%** (ahead of GPT-6 Astra at 58.2%, just behind Claude Opus 5.5 at 66.4%), Kimi Code Bench 3.0 Long-horizon 61.2% (K3 scored 55.95%), BenchCAD with tools 92.7% (Claude Opus 5.5 96.2%, GPT-6 Astra 95.9%), and a state-of-the-art 64.4 on OfficeQA Pro v2, with matching upgrades in finance and 3D creation. Official pricing per million tokens: input **$2.00**, output **$10.00**, cached input $0.20, cache write $2.00 for 5 minutes / $4.00 for 1 hour — roughly 33% below the previous K3 ($3.00 / $15.00). The API is live today as kimi-k3.1-pro, alongside a Highspeed variant (2-3x faster, $4.00 / $20.00). **The full weights are promised by Nov 4**, so the site logs it under the RESTRICTED convention with zero on-site runs.
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