# Moonshot AI releases Kimi K3.1 Pro with 1M-token context and open weights by Nov 4

Digest AI · Generative AI & Models · published 2026-10-23T17:26:02Z · updated 2026-10-23T19:00:07Z

Canonical: https://digestai.news/story/moonshot-ai-releases-kimi-k3-1-pro-with-1m-token-context-and-open-weig

## Summary

Moonshot AI launched Kimi K3.1 Pro on October 24, 2026, the first model in its new K3.1 series, alongside a faster variant called Kimi K3.1 Pro Highspeed. The company describes K3.1 Pro as its most capable 3T-class open-weight model to date, featuring a 1-million-token context window. Both models are available across the Kimi product family: on Kimi.ai, mobile apps for iOS, Android, and HarmonyOS, the Kimi Work desktop application (version 3.1.0+), Kimi Code, and the Kimi API with Zero Data Retention for API customers. Enterprise administrators can enable K3.1 Pro for organizations, with access off by default at launch.

Moonshot AI reports that K3.1 Pro scored 65.7% on Terminal-Bench 4.0, ahead of GPT-6 Astra at 58.2% and narrowly behind Claude Opus 5.5 at 66.4%. On Kimi Code Bench 3.0 Long-horizon, it scored 61.2% versus K3's 55.95%. On BenchCAD for 3D reconstruction, it reached 92.7% with tools, approaching Claude Opus 5.5 at 96.2% and GPT-6 Astra at 95.9%. The company also reports a state-of-the-art 64.4 on OfficeQA Pro v2 for fiscal data analysis, and a reduction in claim-level hallucination rate from 23.4% for K3 to 8.3% on its internal Kimi Hallu Bench Hard. A 3D Make feature is live on kimi.ai and the Kimi app for previewing, editing, and downloading 3D models for printing.

For the open-weight release, Moonshot AI said it identified and removed cyber-related data from training while retaining general-purpose coding tasks. On xdev-bench-hard, a checkpoint without risk-reduction measures solved 90.5% of problems at pass@3, while the final K3.1 Pro reaches 81.0%. The company states that K3.1 Pro's cyber capability remains behind frontier proprietary models available for at least three months. Full model weights for Kimi K3.1 Pro will be released by November 4, 2026.

## Key points

- Kimi K3.1 Pro and Highspeed variant launched with 1M-token context window
- Moonshot AI reports 65.7% on Terminal-Bench 4.0, ahead of GPT-6 Astra at 58.2%
- Full open-weight release scheduled by November 4, 2026

## Why it matters

A 3T-class open-weight model with 1M context and reported coding benchmarks near proprietary leaders expands options for developers and enterprises seeking transparent, auditable models.

## Sources

1. [Moonshot AI Releases Kimi K3.1 Pro, First Model in New K3.1 Series](https://unite.ai/moonshot-ai-releases-kimi-k3-1-pro-first-model-in-new-k3-1-series) (Unite.AI, 2026-10-23)
2. [Chinese AI model Kimi K3.1 Pro is closing in on Anthropic's Claude Opus 5.5](https://the-decoder.com/chinese-ai-model-kimi-k3-1-pro-is-closing-in-on-anthropics-claude-opus-5-5) (The Decoder, 2026-10-23)

## Cite

Digest AI, "Moonshot AI releases Kimi K3.1 Pro with 1M-token context and open weights by Nov 4", 23 October 2026, https://digestai.news/story/moonshot-ai-releases-kimi-k3-1-pro-with-1m-token-context-and-open-weig

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