OpenAI and Anthropic Spark Cybersecurity Arms Race

https://letsdatascience.com/news/openai-and-anthropic-spark-cybersecurity-arms-race-300dcc66

Publish Date: 2026-05-18 06:00:00

OpenAI unveiled Daybreak, a cybersecurity initiative that bundles GPT-5.5, a permissive GPT-5.5-Cyber variant, and Codex-based tooling for vetted defenders, according to CyberScoop and The Hacker News. Anthropic released Mythos, a tightly restricted vulnerability-finding system built on Claude Mythos, as reported by Politico and CyberScoop. CNBC reported that OpenAI told the EU it would grant access to GPT-5.5-Cyber while Anthropic has not yet provided the Commission preview access. Multiple outlets, including Politico and Hacker News, say major vendors and government agencies are testing these models, and security teams warn the faster discovery of vulnerabilities may outpace patching efforts.

Source