--- title: Meet GPT-Red: an LLM super-hacker OpenAI built to make... description: OpenAI has developed GPT-Red, an LLM trained via self-play to automatically red-team its other models. Using a training loop where GPT-Red attacks and other... canonical: https://daily.dev/posts/meet-gpt-red-an-llm-super-hacker-openai-built-to-make-its-models-safer-ug3ty8tcl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Meet GPT-Red: an LLM super-hacker OpenAI built to make its models safer | daily.dev og:description: OpenAI has developed GPT-Red, an LLM trained via self-play to automatically red-team its other models. Using a training loop where GPT-Red attacks and other... og:url: https://daily.dev/posts/meet-gpt-red-an-llm-super-hacker-openai-built-to-make-its-models-safer-ug3ty8tcl og:image: https://api.daily.dev/og/posts/Ug3TY8tcL.png og:image:alt: Meet GPT-Red: an LLM super-hacker OpenAI built to make its models safer og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Meet GPT-Red: an LLM super-hacker OpenAI built to make its models safer **[MIT Technology Review](https://daily.dev/sources/technologyreview)** · 6 min read · 0 upvotes · 0 comments ## Summary OpenAI has developed GPT-Red, an LLM trained via self-play to automatically red-team its other models. Using a training loop where GPT-Red attacks and other models defend, it became more effective at finding vulnerabilities than human red-teamers. Its key discovery is a novel 'fake chain of thought' prompt injection attack that tricks models into acting on spoofed reasoning. When tested, over 90% of GPT-Red's strongest attacks succeeded against GPT-5, but fewer than 23% worked against the new GPT-5.6. OpenAI will not release GPT-Red publicly, citing the significant compute and year-long development investment required to build it. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#security](https://daily.dev/tags/security), [#ai-agents](https://daily.dev/tags/ai-agents), [#openai](https://daily.dev/tags/openai), [#prompt-injection](https://daily.dev/tags/prompt-injection), [#red-teaming](https://daily.dev/tags/red-teaming) [View this post on daily.dev](https://daily.dev/posts/meet-gpt-red-an-llm-super-hacker-openai-built-to-make-its-models-safer-ug3ty8tcl) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Meet GPT-Red: an LLM super-hacker OpenAI built to make its models safer","url":"https://daily.dev/posts/meet-gpt-red-an-llm-super-hacker-openai-built-to-make-its-models-safer-ug3ty8tcl","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/meet-gpt-red-an-llm-super-hacker-openai-built-to-make-its-models-safer-ug3ty8tcl"},"datePublished":"2026-07-15T17:35:38.590Z","dateModified":"2026-07-16T02:25:57.635Z","description":"OpenAI has developed GPT-Red, an LLM trained via self-play to automatically red-team its other models. 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