Moonshot AI · October 24, 2026 · Language model
Kimi 3.1 Pro: Moonshot's Kimi K3.1 Pro
The search Kimi 3.1 Pro is Moonshot AI's Kimi K3.1 Pro, the first model in the K3.1 series. Moonshot's Chinese post, updated October 24, 2026, calls it a 3T-class model with a 1,000,000-token context. Nano AI does not call that API and does not host the weights.
Kimi 3.1 Pro does not make the image
Need a picture? Use Nano Banana 2.1
Kimi K3.1 Pro is a language model Nano AI does not host. Nano Banana 2.1 makes the image in the browser for 8 credits, and GPT Image 2.5, Seedream 5.0 and FLUX.3 Klein are in the same menu.
- Made by
- Moonshot AI
- Released
- October 24, 2026
- Run on Nano AI
- Nano Banana 2.1 · 8 credits per image
- Page updated
- October 31, 2026
Source: kimi.com
What Kimi 3.1 Pro is
Moonshot's tech blog and the Chinese post at kimi.com/news/kimi-k3-1-pro use the spelling Kimi K3.1 Pro. People also type Kimi 3.1 Pro and Kimi K 3.1. The posts say it is a post-trained version of Kimi K3, aimed at coding, 3D creation, financial research and long agent tasks. They also announce Kimi K3.1 Pro Highspeed, which they say runs at about 2 to 3 times the speed. API model IDs in the quick start are kimi-k3.1-pro and kimi-k3.1-pro-highspeed.
The same posts say the model is available on Kimi.ai, the Kimi apps, Kimi Work, Kimi Code and the Kimi API. Kimi Work is described as desktop version 3.1.0 or later. Kimi Code selects it with the /model command. The blog says full weights will be released by 2026-11-04. This page was written on October 31, 2026 and does not link a weight file, because the posts describe a future release rather than a repository you can clone today.
Scores below are Moonshot's own numbers from that tech blog, not a Nano AI benchmark. On Terminal-Bench 4.0 they report 65.7% for K3.1 Pro, 66.4% for Claude Opus 5.5 and 58.2% for GPT-6 Astra. On their internal Kimi Code Bench 3.0 Long-horizon they report 61.2%, against 55.95% for K3. Read the blog before you treat those gaps as independent.
Kimi 3.1 Pro at a glance
- Official spelling
- Kimi K3.1 Pro
- Also searched as
- Kimi 3.1 Pro and Kimi K 3.1
- Vendor post
- kimi.com/news/kimi-k3-1-pro, updated October 24, 2026
- Scale, per Moonshot
- 3T-class, 1,000,000-token context
- API IDs
- kimi-k3.1-pro and kimi-k3.1-pro-highspeed
- Weights
- Promised by 2026-11-04, not linked here
- Vendor scores
- Terminal-Bench 4.0 at 65.7%; their long-horizon bench at 61.2%
- On Nano AI
- Not hosted. Images use Nano Banana 2.1 at 8 credits
Call kimi-k3.1-pro the way Moonshot shows
The snippet is the quick start's create() call as read on October 31, 2026. Set up the client from that page. This site does not proxy the request.
- 1
Open the Kimi API quick start
Moonshot's page documents the client, the key and the base URL. Do not copy a host from a third-party gist.
- 2
Request Kimi K3.1 Pro
Their sample call, with the model ID kimi-k3.1-pro.
completion = client.chat.completions.create( model="kimi-k3.1-pro", messages=[{"role": "user", "content": "Introduce Kimi K3.1 Pro in one sentence."}], ) - 3
Or request Highspeed
Same call, different model ID. Moonshot says this serving is about 2 to 3 times faster.
completion = client.chat.completions.create( model="kimi-k3.1-pro-highspeed", messages=[{"role": "user", "content": "Introduce Kimi K3.1 Pro in one sentence."}], ) - 4
Pick it inside Kimi Code
The blog says Kimi Code selects the model with the /model command, after you install their CLI from their own docs.
Where Moonshot says you can use it
As of the posts read on October 31, 2026. The weight row is a promise, not a file.
| Place | Model | ID or note | Status they published |
|---|---|---|---|
| Kimi API | Kimi K3.1 Pro | kimi-k3.1-pro | Available, per the quick start |
| Kimi API | Highspeed | kimi-k3.1-pro-highspeed | Available, per the quick start |
| Kimi.ai and Kimi Code | Kimi K3.1 Pro | /model in Kimi Code | Available, per the blog |
| Full weights | Kimi K3.1 Pro | No file linked on this page | Promised by 2026-11-04 |
How to use the name without mixing products
One model, three spellings
Kimi K3.1 Pro is the official name. Kimi 3.1 Pro is the spaced search. Kimi K 3.1 is the series spelling, covered on its own page.
Highspeed is not a second brain
Moonshot describes Highspeed as the same model served faster, about 2 to 3 times, under the ID kimi-k3.1-pro-highspeed.
Do not download a repo this page does not name
The posts say full weights by 2026-11-04. Until Moonshot publishes the repository, a third-party folder is not their release.
Pictures are a different product
Kimi K3.1 Pro answers in text. Nano Banana 2.1 on this site makes an image for 8 credits if you paste a prompt into the image generator.
Names people mix up
Figures are from Moonshot's K3.1 Pro posts as read on October 31, 2026. The last row is what Nano AI runs.
| Kimi K3.1 Pro | Kimi K3.1 Pro Highspeed | Kimi K3 | |
|---|---|---|---|
| What it is | First K3.1 model | Faster serving, per Moonshot | The earlier model Pro is post-trained from |
| API ID | kimi-k3.1-pro | kimi-k3.1-pro-highspeed | Not the K3.1 ID |
| Speed, per Moonshot | Baseline | About 2 to 3 times | Not stated as a K3.1 speed |
| Terminal-Bench 4.0 | 65.7% | Not given a separate score in the post | Not the 65.7% line |
| Their long-horizon bench | 61.2% | Not given a separate score in the post | 55.95% |
| On Nano AI | Not hosted | Not hosted | Not hosted |
How to turn a Kimi answer into an image here
- 1
Get the wording from Kimi, on Kimi
Use Kimi.ai, Kimi Code or the API ID kimi-k3.1-pro. This website does not send your prompt to Moonshot.
- 2
Paste a picture prompt into Nano AI
Open the image generator on Nano Banana 2.1. One image costs 8 credits. The prompts below are examples of that step, not Kimi outputs.
- 3
Generate
Sign in. Eligible new accounts get 64 credits, enough for 8 images at 8 credits. The file is a Nano Banana image.
Image prompts for Nano Banana 2.1
Use these on Nano AI after you have a description. They are not Kimi K3.1 Pro outputs.
Study desk
A quiet study desk by a window, open notebook with blank pages, a ceramic cup, soft daylight, no people, no readable text, no logos.
City model
A small physical model of a riverside city on a plywood table, tilt-shift, warm lamp, no people, no readable signs, no logos.
Library aisle
A narrow library aisle, wooden shelves, one empty chair, dusty afternoon light, no people, no readable titles, no logos.
Paper charts
Flat lay of blank cream charts and a black pencil on grey paper, soft shadow, no numbers, no letters, no logos.
If the name does not match the product
- You searched Kimi K 3.1 and found no extra model
- That spelling is the series. The model Moonshot shipped first is Kimi K3.1 Pro. The other page on this site explains the split and links here.
- A download page claims the weights early
- Moonshot's date is 2026-11-04. This page will not treat an unofficial archive as the release.
- The image button is not Kimi
- Nano Banana 2.1 costs 8 credits and talks to this site's image provider. It does not call kimi-k3.1-pro.
Kimi 3.1 Pro does not make the image
Need a picture? Use Nano Banana 2.1
Kimi K3.1 Pro is a language model Nano AI does not host. Nano Banana 2.1 makes the image in the browser for 8 credits, and GPT Image 2.5, Seedream 5.0 and FLUX.3 Klein are in the same menu.
FAQ
Kimi 3.1 Pro FAQ
Spellings, access, and the weight date Moonshot published.
Is Kimi 3.1 Pro the same model as Kimi K3.1 Pro?
Yes. Moonshot's posts spell it Kimi K3.1 Pro. Kimi 3.1 Pro is the same model with spaces. The series wording Kimi K 3.1 has its own page and links back here.
What is the API model ID?
The quick start uses kimi-k3.1-pro. The faster serving is kimi-k3.1-pro-highspeed. Create the client the way Moonshot's quick start shows; this page does not invent a base URL.
Can I download the weights today?
Moonshot says full weights will be released by 2026-11-04. This page was checked on October 31, 2026 and does not link a weight repository.
Are the benchmark numbers independent?
No. 65.7%, 66.4%, 58.2%, 61.2% and 55.95% are figures Moonshot printed in the K3.1 Pro tech blog. Nano AI has not rerun Terminal-Bench 4.0.
Does Nano AI host Kimi?
No. For images, Nano Banana 2.1 costs 8 credits. Eligible new accounts get 64 credits, enough for 8 of those images.
Is Nano AI affiliated with Moonshot?
No. Nano AI is not affiliated with Moonshot AI or Kimi. Kimi 3.1 Pro facts are from their posts and API quick start as read on October 31, 2026.
More from Nano AI
Related pages
Nano AI is an independent service and is not affiliated with Moonshot AI or Kimi. Kimi 3.1 Pro facts, including 65.7%, 61.2%, 55.95% and the 2026-11-04 weight date, are from Moonshot's posts and API quick start as read on October 31, 2026. Nano AI has not rerun those benchmarks and does not host the model.