GPT-5.5 matches heavily hyped Mythos Preview in new cybersecurity tests

OpenAI’s GPT-5.5 matched the heavily hyped Mythos Preview in independent cybersecurity benchmarks, proving that iteration can outperform flashy launches. In tests against 1,200 real-world exploit scenarios, GPT-5.5 achieved a 94.3% detection rate, identical to Mythos Preview's score but at half the computational cost. Rather than chasing publicity, OpenAI focused on refinement, which consistently delivers results that outclass more heavily marketed competitors.