The first model of Moonshot AI's K3.1 series and its most capable Kimi to date: a 3T-class reasoning model with native vision and a 1M-token context. It costs a third less per token than Kimi K3; Moonshot says full weights ship by November 4, 2026.
Pick it if
you want Moonshot's current flagship at a lower rate than Kimi K3
your prompts outgrow the 256K context of Kimi 2.6 and 2.7 Code
you resend long prompts, so cache hits bill at a tenth of input
Skip it if
you need temperature or top_p control: they are fixed
Kimi 2.6 or 2.7 Code covers your workload at a lower rate
Moonshot AI's most capable Kimi model: an open-weights 2.8T-parameter mixture-of-experts with native vision and a 1M-token context. It sits above Kimi 2.6 and Kimi 2.7 Code, which have a 256K context and cost less per token.
Pick it if
you want the model Moonshot calls its most capable
your prompts outgrow the 256K context of Kimi 2.6 and 2.7 Code
you resend long prompts, so cache hits bill at a tenth of input
Skip it if
Kimi 2.6 or 2.7 Code covers your workload at a lower rate
FAQ
Which is cheaper, Kimi K3.1 Pro or Kimi K3?
Kimi K3.1 Pro lists lower input and output prices. On a coding-agent session (2M tokens in, 60,000 out) Kimi K3.1 Pro costs $4.60 and Kimi K3 $6.90.
Can I switch between Kimi K3.1 Pro and Kimi K3 mid-task?
Yes. In an Octomind session, /model octohub:kimi-k3.1-pro and /model octohub:kimi-k3 switch models without losing the conversation, so you can draft on one and review on the other.
Try either model
Switch between models inside the same Octomind session.