Major banks use OpenAI’s Daybreak for cybersecurity defence

Major Australian banks are leveraging OpenAI’s advanced artificial intelligence model, GPT-5.5-Cyber, to identify and test vulnerabilities in their cybersecurity systems. Commonwealth Bank and Westpac have adopted this tool as part of their defense strategies against evolving cyber threats. The move comes amid competition with rival AI firm Anthropic, which has limited access to its Mythos program to a closed group of US technology companies. Anthropic is preparing to present its Mythos program to the Reserve Bank of Australia, demonstrating its ability to detect threats within the financial system and critical infrastructure. The Reserve Bank’s engagement with Anthropic suggests growing interest in AI-driven cybersecurity solutions to safeguard Australia’s financial sector. Meanwhile, OpenAI’s GPT-5.5-Cyber is already in use by Australian banks to simulate cyberattacks and strengthen their defenses. The decision by Commonwealth Bank and Westpac to adopt OpenAI’s model reflects a strategic shift toward AI-powered cybersecurity tools. These banks aim to proactively address fraud and cyber threats by leveraging cutting-edge AI capabilities. The competition between OpenAI and Anthropic highlights the increasing role of AI in shaping the future of cybersecurity, particularly in high-risk industries like finance. Anthropic’s Mythos program, though restricted to US-based companies, remains a focal point for regulators and financial institutions worldwide. Its potential to enhance threat detection in critical infrastructure positions it as a key player in the global cybersecurity landscape. As Australian banks integrate AI into their security frameworks, the collaboration between financial institutions and AI firms is expected to intensify, driving innovation in cyber defense strategies.