Find XO: LLMs Make Fuzzing Harnesses Obsolete: Why AI Security Test Automation Unicorns Emerge (arstechnica.com)

- Anthropic's Mythos Preview discovered 271 vulnerabilities in Firefox 150, and around the same time, XBOW became a unicorn with a $155 million Series C funding. - The investment rationale is that instead of humans writing fuzzing harnesses for each API, a bottleneck, LLMs read code and generate hypotheses to bypass this step. - However, linking reproduction, false positive filtering, and review of fixes is another product challenge, so saying harnesses will disappear is premature.