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🔥 Trending event · 4 sources

Researchers used Anthropic’s Claude to access OpenAI accounts and code repository

First reported September 18, 2026 by Bitcoin.com News · covered by 4 sources

In short

Three researchers at Hacktron used Anthropic’s Claude Opus 5 to chain vulnerabilities and gain access to several OpenAI employees’ ChatGPT and Codex accounts. One compromised account provided access to an internal OpenAI code repository. The effort took less than 72 hours, and OpenAI paid the researchers a $6,500 bounty.

AnthropicOpenAIClaude OpusCodexChatGPTGitHub

Written by our news service from the 4 sources below, updated September 23, 2026.

Timeline
  1. Sep 18, 10:30 UTC · Bitcoin.com News
    White Hats Used Anthropic’s Claude to Break Into OpenAI in 72 Hours ↗
  2. Sep 18, 16:29 UTC · BeInCrypto
    Researchers Earned $6,500 Breaching OpenAI With Anthropic's Claude ↗
  3. Sep 19, 00:40 UTC · CryptoSlate
    Anthropic’s Claude helped 3 researchers breach OpenAI in under 72 hours ↗
  4. Sep 19, 18:36 UTC · The Hacker News
    Claude Opus 5 Helped Researchers Take Over OpenAI Staff Accounts via Chained Flaws ↗
Tone of coverage

How the 3 sources covering this story frame each entity. One source, one vote.

Anthropic1 · 2 · 0
  • neutralBitcoin.com News — “A small team of researchers chained three bugs with Anthropic’s Claude Opus 5” ↗
  • neutralCryptoSlate — “Anthropic’s Claude helped three security researchers breach OpenAI accounts” ↗
  • favorableBeInCrypto — “A rival’s own AI model ended up doing the heavy lifting in a breach against OpenAI” ↗
OpenAI0 · 3 · 0
  • neutralBitcoin.com News — “ended up inside OpenAI’s private code repository” ↗
  • neutralCryptoSlate — “breach OpenAI accounts and reach an internal code repository” ↗
  • neutralBeInCrypto — “Researchers Earned $6,500 Breaching OpenAI With Anthropic's Claude” ↗
Claude Opus1 · 2 · 0
  • neutralBitcoin.com News — “White Hats Used Anthropic’s Claude to Break Into OpenAI in 72 Hours” ↗
  • neutralCryptoSlate — “Anthropic’s Claude helped three security researchers breach OpenAI accounts” ↗
  • favorableBeInCrypto — “Anthropic's Claude to write working exploit code” ↗

Labels are assigned per article by our news service with ≥ 60% confidence and a supporting quote. How it works.

All coverage
White Hats Used Anthropic’s Claude to Break Into OpenAI in 72 Hours

White Hats Used Anthropic’s Claude to Break Into OpenAI in 72 Hours

A small team of researchers chained three bugs with Anthropic’s Claude Opus 5 and ended up inside OpenAI’s private code repository. The whole job took under 72 hours, and OpenAI paid $6,500 for it. The Chain, Link by Link A vulnerable ‘libheif’ library inside Discourse, the forum software, allowed remote code execution (RCE) on the […]

Anthropicneutral
AnthropicClaude OpusOpenAI
Sep 18, 2026 · byBitcoin.com News
Researchers Earned $6,500 Breaching OpenAI With Anthropic's Claude

Researchers Earned $6,500 Breaching OpenAI With Anthropic's Claude

A rival’s own AI model ended up doing the heavy lifting in a breach against OpenAI. Researchers at Hacktron AI used Anthropic’s Claude to write working exploit code. The entire intrusion took under 72 hours. OpenAI ultimately paid a $6,500 bounty once the team proved they had reached its private source code. How an Image The post Researchers Earned $6,500 Breaching OpenAI With Anthropic's Claude appeared first on BeInCrypto .

OpenAIneutral
AnthropicClaude OpusOpenAI
Sep 18, 2026 · byBeInCrypto
Anthropic’s Claude helped 3 researchers breach OpenAI in under 72 hours

Anthropic’s Claude helped 3 researchers breach OpenAI in under 72 hours

Anthropic’s Claude helped three security researchers breach OpenAI accounts and reach an internal code repository within 72 hours. Researchers at cybersecurity startup Hacktron chained an image-processing vulnerability with a flaw in OpenAI’s identity infrastructure in July to gain access to multiple employees’ ChatGPT and Codex accounts. One compromised Codex account was connected to OpenAI’s GitHub […] The post Anthropic’s Claude helped 3 researchers breach OpenAI in under 72 hours appeared first on CryptoSlate .

OpenAIneutral
AnthropicChatGPTClaude Opus
Sep 19, 2026 · byCryptoSlate
Claude Opus 5 Helped Researchers Take Over OpenAI Staff Accounts via Chained Flaws

Claude Opus 5 Helped Researchers Take Over OpenAI Staff Accounts via Chained Flaws

Three researchers at the security firm Hacktron used Anthropic's Claude Opus 5 to chain two flaws and take over the ChatGPT and Codex accounts of several OpenAI employees, then reach an internal OpenAI code repository. The chain began with a bug in the software that runs OpenAI's public help forum and moved through a weakness in OpenAI's own login system. This was security research,

AnthropicCodexOpenAI
Sep 19, 2026 · byThe Hacker News