# OpenAI 已向部分日本銀行提供其新發布的 AI 模型 GPT-5.5 的使用權，以加強網路安全。

*genai, fintech · news · 2026-05-29 · The News International*

## Key points

- OpenAI 已授權部分日本銀行提前使用其新發布的 GPT-5.5 AI 模型。
- 日本財務大臣片山さつき確認此合作旨在對抗來自 Anthropic Mythos 等 AI 的先進網路威脅。
- 日經新聞報導，三菱日聯銀行、三井住友銀行及瑞穗銀行預計將獲得 GPT-5.5 的使用權。
- 日本成立了新的公私協力工作小組，專門應對來自 Anthropic Mythos 等模型的 AI 驅動網路安全風險。
- Google 研究人員首次發現駭客利用 AI 工具創造的獨特零日漏洞。

OpenAI has provided access to its newly-released AI model GPT-5.5 to some Japanese banks in a push to strengthen cybersecurity. According to Japanese Finance Minister Satsuki Katayama, the collaboration with OpenAI will help fight cyberattacks which are becoming prevalent due to release of new AI models with unprecedented capabilities such as Anthropic Mythos. Hackers can misuse these models to identify cybersecurity risks and develop new ways to exploit these loopholes. The announcement comes on Friday after a meeting of Japan’s Finance Minister with US-based artificial intelligence company OpenAI’s chief strategy officer, Jason Kwon, in Tokyo. Speaking to the reporters, Katayama said, “the access to the latest AI models would prove “a big step forward in strengthening Japanese financial institutions' ability to defend against cyberattacks.” However, she did not disclose the names of Japanese banks which would get access to the GPT-5.5. On Thursday, the Nikkei newspaper reported that three banks, including MUFG ‌Bank, ⁠Sumitomo Mitsui Banking Corp and Mizuho Bank are expected to gain access to OpenAI’s latest model. Earlier this month, Japan also launched a public-private working group dedicated to mitigating AI-driven cybersecurity risk that Anthropic’s Mythos pose to the country’s financial institutions. On Friday, Katayama noted that the Japanese government and various financial entities were also expected to utilize Mythos to bolster their own defensive capabilities. Prior to Japanese banks, OpenAI also granted access to its latest models to various European firms including Deutsche Telekom, BBVA and dozens more European companies in the cybersecurity push, aiming to strengthen their resilience against cyber vulnerabilities. On Tuesday, Google researchers have found the first-of-its-kind evidence of the most serious type of security flaw created by hackers through AI tools. Named zero-day exploit, the cyber flaw could lead to massive exploitative event while "subsidizing operations through trial abuse and programmatic account cycling.”

**Companies:** OpenAI, Deutsche Telekom, BBVA, MUFG Bank, Sumitomo Mitsui Banking Corp, Mizuho Bank
**Countries:** Japan, United States

[Read the full story on The News International](https://www.thenews.com.pk/latest/1404044-openai-gives-japanese-banks-access-to-gpt-55-to-fight-cyberattacks)

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