Rather than release Mythos Preview to general availability, we’re giving defenders early controlled access in order to find and patch vulnerabilities before Mythos-class models proliferate across the ecosystem.
LLMS
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Mythos Preview Shows Major Step in AI Cyber Capabilities
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We’ve been tracking the increasing cyber capabilities of AI models for years, which arise as part of their general proficiency at coding. But our new model, Mythos Preview, represents a particularly large step up.
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Project Glasswing: Leading Companies Unite Against AI Cyber Threats
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I’m proud that so many of the world’s leading companies have joined us for Project Glasswing to confront the cyber threat posed by increasingly capable AI systems head-on. nitter.net/AnthropicAI/status/204… Anthropic (@AnthropicAI) 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. anthropic.com/glasswing — https://nitter.net/AnthropicAI/status/2041578392852517128#m
→ View original post on X — @ceobillionaire, 2026-04-07 18:14 UTC
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Claude Mythos Preview: New Model Announcement from Anthropic
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We released Claude Opus 4.6 just two months ago. Today we're sharing some info on our new model, Claude Mythos Preview.
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Security implications and risk assessment of the Mythos AI model
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I was told about the Mythos release, but didn't have access, so have no personal experience to add. Two points from brief:
1) It is not built for IT security, it is just a good enough model that it is good at that too
2) This is the first, not last, model to raise security risks -
Anthropic Won’t Release Mythos Preview Publicly, Tests Safeguards
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We do not plan to make Mythos Preview generally available. Our goal is to deploy Mythos-class models safely at scale, but first we need safeguards that reliably block their most dangerous outputs. We'll begin testing those safeguards with an upcoming Claude Opus model. [Translated from EN to English]
→ View original post on X — @anthropicai, 2026-04-07 18:06 UTC
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Project Glasswing: Securing the World’s Critical Software
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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.
anthroplic.com/glasswing [Translated from EN to English]→ View original post on X — @anthropicai, 2026-04-07 18:06 UTC
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Open-source agent traces dataset: crowdsourcing AI training data
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Very cool open-source traces from @TheZachMueller @LambdaAPI: huggingface.co/datasets/lamb… 150M tokens for @NousResearch's Hermes harness with Kimi-K2.5 & GLM 5.1 that was just released! clem 🤗 (@ClementDelangue) We keep saying we want open-source frontier agents. Fine. Then let’s build the dataset. @badlogicgames, creator of Pi, just shared some of his agent traces used to build Pi on @huggingface. I’m now sharing some of mine too, exporting them from @hermes, @opencode, and Claude via @tracesdotcom, and I’ll keep going. Why this matters: one of the biggest bottlenecks for open-source agent models is the data. And all of us are generating that data every day through our conversations with agents. If enough builders share even a slice of their traces publicly, we can create the largest crowdsourced open dataset for agents. Time to put your tokens where your mouth is and give a chance for open source to win! — https://nitter.net/ClementDelangue/status/2041189872556269697#m
→ View original post on X — @clementdelangue, 2026-04-07 17:57 UTC
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GLM-5.1: Open Source Model with 754B Parameters Tops Benchmarks
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754B parameters, 1.51TB on Hugging Face Z.ai (@Zai_org) Introducing GLM-5.1: The Next Level of Open Source – Top-Tier Performance: #1 in open source and #3 globally across SWE-Bench Pro, Terminal-Bench, and NL2Repo. – Built for Long-Horizon Tasks: Runs autonomously for 8 hours, refining strategies through thousands of iterations. Blog: z.ai/blog/glm-5.1 Weights: huggingface.co/zai-org/GLM-5… API: docs.z.ai/guides/llm/glm-5.1 Coding Plan: z.ai/subscribe Coming to chat.z.ai in the next few days. — https://nitter.net/Zai_org/status/2041550153354519022#m
→ View original post on X — @clementdelangue, 2026-04-07 17:56 UTC
