Anthropic announces Project Glasswing, powered by its new frontier model, Claude Mythos Preview
Yesterday, Anthropic announced its Project Glasswing, a new initiative that brings together Amazon Web Services, Anthropic, Apple, Broadcom, Cisco, CrowdStrike, Google, JPMorganChase, the Linux Foundation, Microsoft, NVIDIA and Palo Alto Networks to reshape cybersecurity.
Introducing Project Glasswing: an urgent initiative to help secure the world’s most critical software.
It’s powered by our newest frontier model, Claude Mythos Preview, which can find software vulnerabilities better than all but the most skilled humans.https://t.co/NQ7IfEtYk7
— Anthropic (@AnthropicAI) April 7, 2026
Anthropic’s Project Glasswing
The Project Glasswing is powered by its new frontier model- Claude Mythos Preview. As part of Project Glasswing, the launch partners mentioned above will use Mythos Preview as part of their defensive security work. Anthropic has also extended access to a group of over 40 additional organisations that build or maintain critical software infrastructure so they can use the model to scan and secure both first-party and open-source systems.
Anthropic is committing up to $100M in usage credits for Mythos Preview across these efforts, as well as $4M in direct donations to open-source security organisations. It is revealed that Claude Mythos Preview has spotted vulnerabilities that in some cases survived decades of human review and millions of automated security tests. This new frontier model found a 27-year-old vulnerability in OpenBSSD and a 16-year-old vulnerability in FFmpeg, though they have now been patched.
Project Glasswing is said to be an important step toward giving defenders a durable advantage in the coming AI-driven era of cybersecurity.
The Claude Mythos Preview benchmark results revealed that the model showed better performance than Anthropic’s next best model, Claude Opus 4.6, on CyberGym. It also showed improved results in Agentic Coding, Reasoning, Agentic search and computer use, than the Opus 4.6 model on the SWE-bench Pro, Terminal-Bench 2.0, SWE-bench Multimodal (internal implementation), SWE-bench Multilingual and SWE-bench Verified.
The company has revealed that they do not plan to make Claude Mythos Preview generally available, but its goal is to enable users to safely deploy Mythos-class models at scale for cybersecurity purposes, as well as for the myriad other benefits that such highly capable models will bring. Anthropic also plans to launch new safeguards with an upcoming Claude Opus model, allowing to improve and refine a model does not pose the same level of risk as Mythos Preview.
In the future, Anthropic will also collaborate with leading security organisations to produce a set of practical recommendations for how security practices should evolve in the AI era. This will potentially include:
- Vulnerability disclosure processes
- Software update processes
- Open-source and supply-chain security
- Software development lifecycle and secure-by-design practices
- Standards for regulated industries
- Triage scaling and automation and
- Patching automation
Availability
Project Glasswing partners will receive access to Claude Mythos Preview to find and fix vulnerabilities or weaknesses in their foundational systems. Anthropic’s commitment of $100M in model usage credits to Project Glasswing and additional participants will cover substantial usage throughout this research preview.
Afterwards, the Claude Mythos Preview will be available to participants at $25/$125 per million input/output tokens (participants can access the model on the Claude API, Amazon Bedrock, Google Cloud’s Vertex AI, and Microsoft Foundry).
Anthropic has donated $2.5M to Alpha-Omega and OpenSSF through the Linux Foundation, and $1.5M to the Apache Software Foundation to enable the maintainers of open-source software to respond to this changing landscapes (maintainers interested in access can apply through the Claude for Open Source program).
Within 90 days, Anthropic will report publicly on what they’ve learned with this research preview, as well as the vulnerabilities fixed and improvements made that can be disclosed. Anthropic has also been in ongoing discussions with US government officials about Claude Mythos Preview and its offensive and defensive cyber capabilities.
