---
title: "OpenAI makes its rival to Anthropic's Mythos more widely available to cyber defenders"
slug: "openai-makes-its-rival-to-anthropics-mythos-more-widely-available-to-cyber-defenders"
date: 2026-05-07
category: tech
tags: [openai, anthropic]
language: en
sources_count: 1
featured: false
publisher: AInauten News
url: https://news.ainauten.com/en/story/openai-makes-its-rival-to-anthropics-mythos-more-widely-available-to-cyber-defenders
---

# OpenAI makes its rival to Anthropic's Mythos more widely available to cyber defenders

**Published**: 2026-05-07 | **Category**: tech | **Sources**: 1

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## TL;DR

OpenAI is rolling out a more permissive version of GPT-5.5 — codenamed "Spud" — to vetted cyber defenders responsible for critical infrastructure.

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## Summary

OpenAI is rolling out a more permissive version of GPT-5.5 — codenamed "Spud" — to vetted cyber defenders responsible for critical infrastructure. Recent testing shows GPT-5.5 nearly matches Anthropic's Mythos at finding and exploiting software bugs, fueling debate over misuse risks. Approved defenders in OpenAI's Trusted Access for Cyber program now get access to GPT-5.5-Cyber.

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## Why it matters

OpenAI is rolling out a more permissive version of GPT-5.5 — codenamed "Spud" — to vetted cyber defenders responsible for critical infrastructure.

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## Key Points

- OpenAI is rolling out a more permissive version of GPT-5.5 — codenamed "Spud" — to vetted cyber defenders responsible for critical infrastructure.
- Recent testing shows GPT-5.5 nearly matches Anthropic's Mythos at finding and exploiting software bugs, fueling debate over misuse risks.
- Approved defenders in OpenAI's Trusted Access for Cyber program now get access to GPT-5.5-Cyber.

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## Nauti's Take

Promising: GPT-5.5-Cyber finally gives defenders a model on par with Anthropic's Mythos — ideal for red-team exercises and vulnerability hunting on critical infrastructure. The catch is dual-use risk: what defenders use legitimately today can leak or be misused tomorrow. Teams in the Trusted Access program win big — everyone else should sharpen detection pipelines in parallel.

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## FAQ

**Q:** What is OpenAI makes its rival to Anthropic's Mythos more widely available to cyber defenders about?

**A:** OpenAI is rolling out a more permissive version of GPT-5.5 — codenamed "Spud" — to vetted cyber defenders responsible for critical infrastructure.

**Q:** Why does it matter?

**A:** OpenAI is rolling out a more permissive version of GPT-5.5 — codenamed "Spud" — to vetted cyber defenders responsible for critical infrastructure.

**Q:** What are the key takeaways?

**A:** OpenAI is rolling out a more permissive version of GPT-5.5 — codenamed "Spud" — to vetted cyber defenders responsible for critical infrastructure.. Recent testing shows GPT-5.5 nearly matches Anthropic's Mythos at finding and exploiting software bugs, fueling debate over misuse risks.. Approved defenders in OpenAI's Trusted Access for Cyber program now get access to GPT-5.5-Cyber.

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## Related Topics

- [openai](https://news.ainauten.com/en/tag/openai)
- [anthropic](https://news.ainauten.com/en/tag/anthropic)

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## Sources

- [OpenAI makes its rival to Anthropic's Mythos more widely available to cyber defenders](https://www.axios.com/2026/05/07/openai-gpt-55-cybersecurity-model) - Axios AI

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## About This Article

This article is a synthesis of 1 sources, curated and summarized by AInauten News. We aggregate AI news from trusted sources and provide bilingual (German/English) coverage.

**Publisher**: [AInauten](https://www.ainauten.com) | **Site**: [news.ainauten.com](https://news.ainauten.com)

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*Last Updated: 2026-05-08*