# 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.

Last verified: 2026-10-26 · Evidence: Reported · Canonical: https://theagenticweekly.com/models/kimi-k3-1-pro · JSON: https://theagenticweekly.com/api/models/kimi-k3-1-pro

## Key facts

| Fact | Value | Source |
|---|---|---|
| Vendor | Moonshot AI |  |
| Released | Oct 23, 2026 | https://vercel.com/changelog/kimi-k3-1-pro-and-kimi-k3-1-pro-highspeed-are-available-now-in-ai-gateway |
| API id | `kimi-k3.1-pro` | https://www.kimi.ai/blog/kimi-k3-1-pro |
| Context window | 1,048,576 tokens (1.05M). Moonshot states 1M tokens; the pricing page gives 1,048,576. | https://www.kimi.ai/resources/kimi-k3-1-pro-pricing |
| Parameters | 2.8T total, 104B active, mixture-of-experts | https://artificialanalysis.ai/articles/kimi-k3-1-pro-launch-benchmarks |
| 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. | https://www.kimi.ai/blog/kimi-k3-1-pro |
| 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. | https://www.kimi.ai/resources/kimi-k3-1-pro-pricing |

## Vendor claims and neutral signals

- 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 here is Reported from the sources below.

## Not verified, left out

- 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

- [Kimi K3.1 Pro blog](https://www.kimi.ai/blog/kimi-k3-1-pro)
- [Vercel AI Gateway changelog](https://vercel.com/changelog/kimi-k3-1-pro-and-kimi-k3-1-pro-highspeed-are-available-now-in-ai-gateway)
- [Kimi K3.1 Pro pricing page](https://www.kimi.ai/resources/kimi-k3-1-pro-pricing)
- [Artificial Analysis launch benchmarks](https://artificialanalysis.ai/articles/kimi-k3-1-pro-launch-benchmarks)

Data licence: CC BY 4.0. Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0.