Kimi K3.1 Pro

Kimi K3.1 Pro (23 October 2026) is Moonshot AI's flagship — a "3T-class" model with a 1M-token context, built for coding, 3D modelling and financial research. Moonshot reports 65.7% on Terminal-Bench 4.0, close to Claude Opus 5.5's 66.4%. It runs in thinking mode only, and its open weights are due by 4 November 2026.

Best for

• Agentic coding and long-horizon software tasks
• Research and analysis over very long documents (1M context)
• Teams that want near-frontier quality with a self-hosting option later
• Kimi Code users

How it compares — and the India angle

• On Moonshot's own Terminal-Bench 4.0 table it is 0.7 points behind Claude Opus 5.5 and 7.5 ahead of GPT-6 Astra. Vals.ai independently ranks it 8th of 27 models.
• Thinking cannot be switched off — requests without it are rejected — so reasoning tokens are part of every bill.
• Moonshot removed cyber-security data from training for the open release; its internal cyber benchmark fell from 90.5% to 81.0%.
• Until 4 November it is API-only. For a fully permissive licence today, DeepSeek V4.1 Flash is MIT.