# Moonshot says Kimi K3.1 Pro filtering reduces exploit-solving performance

_Published Monday, October 26, 2026 at 5:18 AM EDT · AI, Security · Latest · Tier 2 — Notable_

![Moonshot says Kimi K3.1 Pro filtering reduces exploit-solving performance — Primary](https://s.yimg.com/lo/mysterio/api/8b252f5ce873e1ce1073ab3f7c04f304fa7f1f7a5082a646dd78f1af5da67c8b/lightyear_networkapi/resizefill_w1200%3Bquality_80%3Bformat_webp/https%3A%2F%2Fmedia.zenfs.com%2Fen%2Fbeincrypto_us_662%2F4eb677dd7b001afc65dc1bbd58a16398.png)

Moonshot AI says it removed cyber-related training data and reinforcement learning environments from Kimi K3.1 Pro, reducing its performance on the company's internal exploit benchmark. The filtered model solved 81% of tasks, compared with 90.5% for an unfiltered version; general coding tasks remained in training.

The Beijing-based startup plans to release the model's open weights by November 4, allowing users to download and run it on their own hardware. Ethereum co-founder Vitalik Buterin endorsed restricting capabilities rather than screening users. The filtering leaves substantial exploit-solving capability: Moonshot says rival open model DeepSeek V4.1-Flash scored 85.7% on the same benchmark.

## Sources

- [YAHOO!](https://tech.yahoo.com/ai/articles/vitalik-buterin-backs-ai-model-073328287.html)

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Canonical: https://techandbusiness.org/newswire/fL1PoU7_rFStY9MMc6FGYJ
Published: 2026-10-26T09:18:12.746Z
Story chronology: 2026-10-26T07:33:28.000Z
Retrieved: 2026-10-26T11:27:23.759Z
Publisher: Tech & Business (techandbusiness.org)