“This is a significant step.”
That was how Japan’s Finance Minister Satsuki Katayama described the decision to give some of the country’s largest banks access to OpenAI’s newest AI model as concerns around cyberattacks continue rising inside the financial sector.
The move shows how quickly the relationship between banks and artificial intelligence is changing.
For years, financial institutions mostly treated AI as a customer service tool. Chatbots. Fraud detection. Internal automation.
Now the focus is shifting toward defense.
Japanese officials say advanced AI systems are increasingly being used to identify weaknesses inside financial networks, creating fears that banks could become more exposed as cyber threats grow more sophisticated.
According to Reuters and Nikkei, the banks expected to receive access include Mitsubishi UFJ Financial Group, Sumitomo Mitsui Banking Corp, and Mizuho Bank, three of the biggest lenders in Japan.
The model itself is only being made available to what OpenAI calls trusted partners.
Officials did not publicly explain exactly how the system will be used inside the banks, but discussions have centered heavily around cybersecurity and identifying vulnerabilities before attackers do.
“We will bring together the core members who bear the greatest responsibility,” Katayama said earlier while discussing separate meetings around AI related financial risks.
Inside Japan’s financial sector, the anxiety around AI security has been building quietly for months.
Regulators have already created special working groups to discuss the risks tied to advanced AI systems, particularly models capable of identifying security gaps inside older banking infrastructure.
That concern is not limited to OpenAI.
Another company, Anthropic, has also been working with Japanese banks around its own advanced cybersecurity focused AI model called Mythos. Reuters reported earlier this month that Japan’s megabanks were expected to gain access to that system as well.
One Tokyo based financial analyst, Keita Moriyama, said the situation reflects a larger global race happening quietly behind the scenes.
“Banks are afraid of falling behind attackers who may already be using similar systems.”
The pressure is especially intense in Japan because many major financial institutions still rely partly on older technology systems that experts say can be difficult to secure fully.
That creates an uncomfortable situation.
AI can help strengthen security.
But the same technology can also help attackers move faster.
OpenAI has already started expanding similar programs outside Japan. Earlier this month, the company announced that European telecom firms, banks, and infrastructure companies would also gain access to newer cybersecurity focused AI systems.
In Tokyo, though, officials appear careful about how fast this expands.
Meetings involving banks, regulators, and government agencies have focused not only on using AI safely, but also on understanding what happens if the technology becomes too powerful or too widely available too quickly.
For ordinary customers, most of this remains invisible for now.
Bank apps still look the same. ATMs still work normally. Daily transactions continue quietly.
But underneath those systems, a new kind of arms race is already taking shape between financial institutions trying to protect themselves and cyber threats evolving alongside the same AI technology meant to stop them.
