Claude Mythos Preview
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Anthropic expands its Claude Mythos preview to more partners
Anthropic expands its Claude Mythos preview to more partners The company has invited approximately 150 more organizations to Project Glasswing. When Anthropic announced Claude Mythos at the start of April, the company didn't release the new frontier model to the public. Instead, it a made a preview available to select organizations through an effort it called Project Glasswing.
Claude Fable 5
Claude Fable 5 and Claude Mythos 5 Today we’re launching Claude Fable 5: a Mythos-class1 model that we’ve made safe for general use. Fable 5’s capabilities exceed those of any model we’ve ever made generally available.
Anthropic scales Claude Mythos to critical infrastructure in 15 countries
Anthropic is expanding Project Glasswing, its joint industry initiative to find and fix critical software vulnerabilities using AI, to about 150 new organizations across more than 15 countries, the company said Tuesday. The news comes a day after Anthropic said it had filed confidentially for an initial public offering, following a $65 billion funding round at a nearly $1 trillion valuation. Anthropic’s Claude Mythos is at the heart of Project Glasswing.
Anthropic Offers Mythos Upgrade for Cyber Partners and a ‘Safe’ Version for the Rest of You
Anthropic released two new AI models called Claude Fable 5 and Claude Mythos 5 on Tuesday, which the company says have greater capabilities than the Mythos Preview model it released in April to a limited set of tech industry partners. Anthropic has said the initial, limited release stemmed from concerns that the model’s capabilities could be exploited by bad actors to develop hacking tools that could catch defenders off guard. Anthropic is currently only releasing Claude Mythos 5 to a...
Expanding Project Glasswing
Expanding Project Glasswing Project Glasswing is our collaborative effort to secure the world’s most important software. In early April, we announced that roughly 50 initial partners had access to Claude Mythos Preview, and since then, they’ve been deploying the model to scan their codebases for vulnerabilities. We recently described how these partners have so far found more than ten thousand high- or critical-severity security flaws.
Anthropic spins a Fable of a tamer, safer Mythos
Anthropic's Mythos model, supposedly too dangerous for public release in April, is now available to wreak havoc or tackle other tasks for a hefty price and with some new guardrails in place. Just make sure you don't mind having Anthropic keep some of your data for a while. The AI biz on Tuesday announced public availability of Claude Fable 5, a Mythos-class model, and private availability of Claude Mythos 5 for Glasswing partners.
Australia joins exclusive club granting access to advanced AI
Australia gains access to powerful AI amid questions about readiness Thu 4 Jun 2026 at 4:57am In short: The Australian government and several private companies have gained access to a powerful artificial intelligence model not released publicly due to its cybersecurity risk. Anthropic has granted 150 organisations across 15 countries, including Australia, access to its Claude Mythos Preview as part of the expansion of its Project Glasswing. Independent MP Kate Chaney is calling on the...
Anthropic's open-source framework for AI-powered vulnerability discovery
A reference implementation for autonomous vulnerability discovery and remediation with Claude, based on our learnings from partnering with security teams at several organizations since launching Claude Mythos Preview. For a write up of these learnings along with best practices, see the accompanying blog post (also available in blog-post.md ). For a lightweight SDK-only walkthrough of the same recon → find → triage → report → patch loop, see the companion cookbook.
Anthropic Calls Mythos Dangerous. Why Is It Expanding Access?
The Anthropic logo on a laptop arranged in Forest Hills, New York, US, on Wednesday, April 22, 2026. Anthropic PBC has said its new artificial intelligence tool, Claude Mythos Preview, is too powerful to release to the general public. Gabby Jones/Bloomberg
Anthropic Cuts Unauthorized Platform List by Half After Pushback
The Anthropic logo on a smartphone arranged in Forest Hills, New York, US, on Wednesday, April 22, 2026. Anthropic PBC has said its new artificial intelligence tool, Claude Mythos Preview, is too powerful to release to the general public.