# Doppel's AI defense system stops attacks before they spread

DevFeed: [Doppel's AI defense system stops attacks before they spread](<https://devfeed.tech/articles/doppel-s-ai-defense-system-stops-attacks-before-they-spread-6387.md>)

Original publisher: [Read original article](<https://openai.com/index/doppel>)

Published: 2025-10-28T10:00:00Z

Content type: article

Language: en

Sources: [OpenAI News](<https://devfeed.tech/sources/openai-news.md>)

Topics: [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [threat detection](<https://devfeed.tech/topics/threat-detection.md>), [Large Language Model](<https://devfeed.tech/topics/llm.md>), [Fine-tuning](<https://devfeed.tech/topics/fine-tuning.md>), [OpenAI](<https://devfeed.tech/topics/openai.md>), [Social engineering](<https://devfeed.tech/topics/social-engineering.md>), [human feedback](<https://devfeed.tech/topics/human-feedback.md>), [spoofing](<https://devfeed.tech/topics/spoofing.md>)

Tags: [ai](<https://devfeed.tech/tags/ai.md>), [fine-tuning](<https://devfeed.tech/tags/fine-tuning.md>), [gpt](<https://devfeed.tech/tags/gpt.md>), [human-feedback](<https://devfeed.tech/tags/human-feedback.md>), [internet](<https://devfeed.tech/tags/internet.md>), [phishing](<https://devfeed.tech/tags/phishing.md>), [social-engineering](<https://devfeed.tech/tags/social-engineering.md>), [threat-detection](<https://devfeed.tech/tags/threat-detection.md>)

## AI overview

Doppel uses OpenAI GPT-5 and o4-mini models, together with reinforcement fine-tuning and human-graded feedback, to detect, classify, and remove deepfake, phishing, spoofed-domain, and impersonation threats. The system reduces analyst workloads by 80%, triples threat-handling capacity, and cuts response times from hours to minutes.

## Source excerpt

Doppel uses GPT-5 and reinforcement fine-tuning to stop deepfake and impersonation attacks, cutting analyst workloads by 80% and reducing response times from hours to minutes.