Model review
Kimi K3.1 Pro review
Kimi K3.1 Pro review: Moonshot's listed price of $2 / $10 per million tokens, 1M context, promised open weights, and what is not yet stated. Not tested.
The short answer
Kimi K3.1 Pro costs 2 dollars per million input tokens and 10 dollars per million output tokens on Moonshot's platform page, with about a 1 million token context window. Moonshot calls it open weight but had not released the weights when we read the page. It has not been tested by BestSuperintelligent.
Verdict: Moonshot's newer Kimi model, listed below Kimi K3's price and described by Moonshot as a post-trained K3 with more post-training compute. We have not tested it and no benchmark is published here. Editorial interpretation from vendor pages
What is the evaluation status of Kimi K3.1 Pro?
Research-based and not tested. Price: read from Moonshot's platform page on 2026-10-24. Security: unverified; see security evidence. Editor approval: approved at the editor's instruction to publish.
What are the specs of Kimi K3.1 Pro?
| Aspect | Detail |
|---|---|
| Vendor / family | Moonshot AI / Kimi K3 |
| Model ID | kimi-k3.1-pro (a kimi-k3.1-pro-highspeed variant is also listed) |
| Context window | 1,048,576 tokens for the K3 series per the pricing page; the quickstart says 1 million |
| Max output | 131,072 tokens by default, up to 1,048,576 (max_completion_tokens) |
| Modalities | Text, image input, video input, tools |
| Weights | Described as open-weight; full weights promised by Nov 4, not yet available when read |
| Release date | Not stated on the pages read |
| Reasoning | Always on; reasoning_effort low, high or max (default max) |
Specs come from the Moonshot pages listed below, read on 2026-10-24. A value shown as not stated was not found on a vendor page that day.
How much does Kimi K3.1 Pro cost?
| Item | USD / 1M tokens |
|---|---|
| Input | $2 |
| Output | $10 |
| Cached input | Not confirmed (the pricing table was not readable in our fetch) |
Moonshot says billing is flat per token with no tiering by context length, and that cache writes are billed by time to live (5 minutes or 1 hour). Access needs a top-up of at least $1. Vendor-reported claim
Where does Kimi K3.1 Pro look strong?
- Priced at $2 / $10, below the $3 / $15 Moonshot lists for Kimi K3 [2]. Vendor-reported claim
- Moonshot describes it as "our most capable 3T-class open-weight model to date", a post-trained version of Kimi K3 with substantially larger post-training compute [1]. Vendor-reported claim
- Structured output with a strict JSON schema, custom tools, tool_choice, dynamic tool loading, automatic context caching, and image and video input are listed [1]. Vendor-reported claim
Where does Kimi K3.1 Pro look weak?
- The weights were not yet released when we read the page, so "open weights" is a promise, not something to download [1]. Vendor-reported claim
- The quickstart's benchmark comparisons were unfilled placeholders, so there is no usable vendor benchmark [1]. Editorial interpretation
- Sampling values are fixed (temperature 1.0, top_p 0.95), and Moonshot does not recommend its web search tool for production use in the near term [1]. Vendor-reported claim
Which tasks have we tested Kimi K3.1 Pro on?
| Test | Task | Score | Cost per run |
|---|---|---|---|
| — | Not yet tested | — | — |
What benchmark results exist for Kimi K3.1 Pro?
None published here. Moonshot's quickstart shows comparison tables with unfilled placeholders instead of scores.
How does Kimi K3.1 Pro compare with other models?
- Predecessor: Kimi K3 at $3 / $15, which Moonshot now labels previous generation [2].
- Similar price: Claude Sonnet 5.5 and GPT-6.1 Sol at $2 / $10, and Grok 4.7 at $2 / $6.
- Cheaper open weights: DeepSeek V4.1 Flash at $0.30 / $1.20.
What is not yet verified about Kimi K3.1 Pro?
- Hands-on quality, speed and reliability
- Release date, and whether the weights were released
- Cached-input and cache-write prices
- Security and data-handling scope; see security evidence
What should you read next?
What changed in this review?
| Date | Change | By |
|---|---|---|
| 2026-10-24 | Page created at the editor's request from Moonshot's quickstart, pricing and platform pages. Price $2 / $10 read from the platform page. Fields those pages do not state are marked not stated. | BestSuperintelligent |
Evidence in this article Vendor-reported claim A statement made by the company that sells the product. Useful as a lead, not as a finding.
Frequently asked questions
Has BestSuperintelligent tested Kimi K3.1 Pro?
No. This review is research-based. Every figure comes from a cited Moonshot page, and no test result or benchmark is published here.
How much does Kimi K3.1 Pro cost?
Moonshot's platform page lists $2 per million input tokens and $10 per million output tokens, read on 2026-10-24. Cache-hit and cache-write rates were not readable in our fetch of the pricing table, so they are not shown.
Is Kimi K3.1 Pro open weights?
Moonshot calls it an open-weight model but says the full weights will be released by Nov 4, so they were not yet available when we read the page on 2026-10-24. Check the licence before commercial use.
What are the context window and maximum output of Kimi K3.1 Pro?
Context window: about 1 million tokens, which Moonshot's pricing page puts at 1,048,576 for the K3 series. Maximum output: the quickstart sets 131,072 tokens by default and allows up to 1,048,576.
Sources
- Moonshot AI, Kimi K3.1 Pro quickstart platform.kimi.ai, accessed .
- Moonshot AI, Kimi API platform home (model list and prices) platform.kimi.ai, accessed .
- Moonshot AI, Kimi API pricing (K3 series context window and billing rules) platform.kimi.ai, accessed . The price table did not render in our fetch; prices come from the platform home page.