AI ResearchJul 16, 2026, 6:48 PM

OpenAI Details GPT-Red: An Internal Automated Red-Teaming Model That Beat Human Red-Teamers 84% To 13% On Prompt Injection

Evolving story · 3 updatesOpenAI GPT-Red safety systemTimeline →
30-second summary

OpenAI's GPT-Red model outperformed human red-teamers in a prompt injection test, with a success rate of 84% compared to 13%. The model was trained using self-play reinforcement learning against a population of defender LLMs.

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OpenAI Details GPT-Red: An Internal Automated Red-Teaming Model That Beat Human Red-Teamers 84% To 13% On Prompt Injection
Key takeaways
  • GPT-Red outperformed human red-teamers in a prompt injection test
  • The model was trained using self-play reinforcement learning
  • GPT-Red discovered a novel attack class called 'Fake Chain-of-Thought'
  • The model helped reduce the failure rate of GPT-5.6 Sol by a factor of six
Full story

OpenAI has developed an internal automated red-teaming model called GPT-Red, which has demonstrated impressive capabilities in identifying vulnerabilities in language models. The model was trained using self-play reinforcement learning, where it played against a population of defender LLMs. This approach allowed GPT-Red to learn and improve its attack strategies.

The results of the test were striking, with GPT-Red outperforming human red-teamers by a significant margin. The model's success rate of 84% compared to the human team's 13% highlights the potential of automated red-teaming in AI security testing.

One of the key findings of the test was the discovery of a novel attack class called "Fake Chain-of-Thought". This attack exploits the way language models process and generate text, and it has significant implications for the development of more secure AI systems.

OpenAI has also reported that GPT-Red has helped to reduce the failure rate of its GPT-5.6 Sol model by a factor of six on a direct injection benchmark. However, the company acknowledges that there is still work to be done, particularly in addressing multi-turn and image-based attacks.

The development of GPT-Red is an important step forward in the field of AI security, and it has significant implications for the development of more secure and robust language models.

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Why this matters
Developers

Improved AI security testing

Businesses

More secure language models

Investors

Potential for increased investment in AI security

Everyone

Advancements in AI security

Glossary
red-teaming
The practice of testing a system's defenses by simulating an attack
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