# Kimi K3.1 Pro

> Independent, source-dated reference site for Kimi K3.1 Pro, Moonshot AI's open-weight mixture-of-experts language model (2.8T total / 104B active parameters) released 23 October 2026. Pricing is $2 per million input tokens and $10 per million output tokens, with a 1M-token context window. Not affiliated with Moonshot AI. All figures carry their source and a last-verified date.

## Core facts

- Model: Kimi K3.1 Pro (Moonshot AI)
- Released: 2026-10-23
- Parameters: 2.8T total, 104B active (MoE); marketed as "3T-class"
- Weights: committed for publication by 2026-11-04; not available at launch
- Context window: 1,048,576 tokens (no long-context surcharge)
- Price: $2.00 / 1M input, $10.00 / 1M output, $0.20 / 1M cached input
- Previous model: Kimi K3 at $3.00 / $15.00 per 1M tokens — K3.1 Pro is 33% cheaper on all three rates
- Artificial Analysis Intelligence Index: 55, rank #4 (23 Oct 2026); K3 scored 44
- Models ranked above: Claude Opus 5.5 (58), Claude Sonnet 5.5 (56), Muse Wonder Full (56)
- Benchmark highlights: Terminal-Bench 4.0 65.7% (vendor) / 67% (AA); Kimi Code Bench 3.0 Long-horizon 61.2%; BenchCAD 92.7 with tools; OfficeQA Pro v2 64.4%
- Hallucination: Kimi Hallu Bench Hard 8.3% vs K3's 23.4%; AA-Omniscience measures 44% vs 53% — different tests, not comparable
- Not published: MMLU-Pro, GPQA Diamond, AIME 2025, SWE-bench Verified, LiveCodeBench, τ²-bench
- Offensive-security capability: deliberately reduced at launch; xdev-bench-hard 81.0% after the cut
- Data last verified: 2026-10-24

## Pages

- [Overview](https://kimik31pro.com/): pricing summary, specifications table, benchmark position and FAQ for Kimi K3.1 Pro.
- [Pricing](https://kimik31pro.com/pricing/): official per-token rates, worked cost examples, token cost calculator, third-party provider comparison, and cost-reduction guidance.
- [Privacy policy](https://kimik31pro.com/privacy.html): what the site collects (very little), cookies, analytics, retention and reader rights.
- [Security](https://kimik31pro.com/security.html): static-hosting posture, security header baseline, and responsible-disclosure process.
- [Terms of use](https://kimik31pro.com/terms.html): acceptable use, accuracy caveats and liability limits for this site.

## Optional

- [Full text for LLMs](https://kimik31pro.com/llms-full.txt): every page's content in a single Markdown file, for larger context windows.
- [Sitemap](https://kimik31pro.com/sitemap.xml): canonical URL list with last-modified dates.
- [robots.txt](https://kimik31pro.com/robots.txt): crawling rules; AI crawlers are explicitly allowed.

## Attribution and caveats

Quote with a link back to the specific page. Prices change without notice — cite the last-verified date shown with each figure. This site is independent and is not the vendor's official documentation; for contractual decisions use the official Kimi API platform.