Moonshot AI · llm model
Kimi K3.1 Pro
Kimi K3.1 Pro is Moonshot AI's latest language model in our dataset, released Oct 23, 2026. Open weights are promised but not yet published. Moonshot's post-trained successor to Kimi K3, a 3T-class model with a 1M-token context, live in Kimi apps and the API on Oct 23, 2026; open weights are promised by Nov 4. Verified against vendor sources on Oct 26, 2026.
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- ReleasedOct 23, 2026
- Context window1.05M1,048,576 tokens
- LicenceWeights unpublishedNot yet published
Modalities not verified
Key facts
| Fact | Value | Source |
|---|---|---|
| Vendor | Moonshot AI | n/a |
| Released | Oct 23, 2026 Vercel's AI Gateway changelog, dated Oct 23, 2026, lists K3.1 Pro as available that day; Artificial Analysis also dated its launch write-up Oct 23. Moonshot's blog carries no date; Reuters reported the launch on Oct 24 Beijing time. | source |
| Status | generally available | n/a |
| API id | kimi-k3.1-pro A faster sibling, kimi-k3.1-pro-highspeed, launched alongside it. | source |
| Context window | 1,048,576 tokens (1.05M) Moonshot states 1M tokens; the pricing page gives 1,048,576. | source |
| Parameters | 2.8T total, 104B active, mixture-of-experts Figures are from Artificial Analysis; Moonshot itself only says "3T-class". | source |
| Licence | Not yet published Moonshot calls it an open-weight model and says the full weights will be released by Nov 4, 2026. Until the weights and license are published we do not label it open-weights. | source |
| Pricing | $2 in / $10 out per 1M tokens Highspeed variant: $4.00 input, $20.00 output, $0.20 cached input. Rates checked by Moonshot on Oct 24, 2026. | source |
Where Kimi K3.1 Pro sits in our data
- Released Oct 23, 2026 (week 43 of 2026), in October 2026. Other models in our data released that month: GPT-6.1 Terra, Kimi K3.1 Pro Highspeed, Nemotron 3.5 Bolt E4B (4GB), Voxtral 3, Mercury 3, MiniMax M3.1 Flash.
- The previous Moonshot AI model we track is Kimi K3 (Jul 16, 2026), 99 days earlier.
- Of the 60 models in our data with a published context window, Kimi K3.1 Pro has the number 11 largest (1.05M tokens). Our data is not every model on the market.
- All releases by date: AI model releases by month · new AI models this week. Choosing for code: best LLM for coding.
How Kimi K3.1 Pro differs from Kimi K3.1 Pro Highspeed
Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.
- Listed price is $2 in and $10 out, against $4 in and $20 out for Kimi K3.1 Pro Highspeed (per 1M tokens).
- Both list a 1.05M-token context window.
- Both were released on Oct 23, 2026.
- Facts for the other model: Kimi K3.1 Pro Highspeed.
What the sources say
These are claims from the linked pages, not our measurements.
- Moonshot reports 65.7% on Terminal-Bench 4.0 (Claude Code harness), against 66.4% for Claude Opus 5.5 and 58.2% for GPT-6 Astra. This is a vendor-run figure.
Notes
- Artificial Analysis scored it 55 on its Intelligence Index at launch (4th, behind Claude Opus 5.5 at 58, Claude Sonnet 5.5 at 56 and Muse Wonder Full at 56) and 67% on Terminal-Bench 4.0 in its own run, which differs from Moonshot's 65.7%.
- The faster tier, Kimi K3.1 Pro Highspeed, has its own page: /models/kimi-k3-1-pro-highspeed.
What we tested
Nothing yet. We have not run Kimi K3.1 Pro ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.
Not verified, left out
We could not confirm these on a vendor page, so we do not state them.
- Input and output modalities were not confirmed on Moonshot's own pages.
- Weights and license are not published yet; Moonshot says they arrive by Nov 4, 2026.
Sources
More from Moonshot AI
- Kimi K3.1 Pro Highspeed (Oct 23, 2026)
- Kimi K3 (Jul 16, 2026)