# Anthropic measures open model GLM-5.3's cyber offence skills | QANATONE > Anthropic says Zhipu's GLM-5.3 nearly matches Claude Mythos Preview at writing exploits, and its safeguards fail 64-100% of the time. Kaynak: https://www.qanatone.com/en/haber/anthropic-glm-5-3-siber-yetenek/ --- [News](https://www.qanatone.com/en/haber/) # Anthropic measures open model GLM-5.3's cyber offence skills 30 Sep 2026 1 min read News · Models Anthropic says Zhipu's GLM-5.3 nearly matches Claude Mythos Preview at writing exploits, and its safeguards fail 64-100% of the time. ## The test On Chrome V8 vulnerabilities GLM-5.3 built working exploit chains in 50 of 410 attempts, against 56 for Claude Mythos Preview. A proof of concept chaining a new Chrome bug with a known flaw took 20 minutes of human time and eight hours of model time, costing $20.40 through Zhipu's API. ## Safeguards Framed as a red-team exercise, the model attempted to connect to the target in 64% of runs; prefilling its reasoning raised that to 92%, and removing refusals to 100%. The same attacks failed on safeguarded Claude models. Anthropic says governments should test capable models and defenders need tools as good as attackers have. ## More articles [News · Payments ### BIST 100 falls 2.79%, drops below 12,000 30 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/bist-100-fon-sorusturmasi-dususu/)[News · Payments ### Weak US data cuts rate-hike bets, bitcoin steadies 30 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/bitcoin-eylul-faiz-beklentisi/)[News · Infrastructure ### CoreWeave puts Nvidia Vera Rubin NVL72 into production 30 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/coreweave-vera-rubin-uretimde/)[News · Policy ### US agencies told to say super intelligence instead of AI 30 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/super-zeka-kararnamesi-federal-kurumlar/)[News · Search ### US launches America.gov, an AI portal for federal services 29 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/america-gov-yapay-zeka-portali/)[News · Funding ### Anthropic's IPO draft: compute spend tripled 29 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/anthropic-halka-arz-taslagi/)[News · Policy ### Six AI firms sign voluntary White House safety accord 29 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/beyaz-saray-yapay-zeka-guvenlik-anlasmasi/)[News · Policy ### Turkey sets up a Fund Coordination Board for liquidated funds 29 Sep 2026 · 1 min](https://www.qanatone.com/en/haber/fon-koordinasyon-kurulu-kuruldu/)