As such, Anthropic pulled the brakes on Mythos. While it maintained that it would eventually release the model to the public, it first needed to trial it with a limited pool of trusted testers, in what it calls "Project Glasswing." To start, that meant opening up the model to the U.S. and other governments. While Mythos is still not available to the likes of you or me, Anthropic is releasing a new model that promises many of the capabilities of Mythos, without the accompanying cybersecurity risks.
What are Anthropic's Fable 5 and Mythos 5?
According to Anthropic's benchmarking, Fable 5 and Mythos 5 alike outperform Mythos Preview, Opus 4.8, OpenAI's GPT-5.5, and Google's Gemini 3.1 Pro, in the following categories: agentic coding, knowledge work, spatial reasoning, tool use, legal, multidisciplinary reasoning (without tools), biology, cybersecurity, and health. Mythos Preview ekes out a win in computer use and multidisciplinary reasoning (with tools), but it's a clean sweep over all other models.
Credit: AnthropicHow is Anthropic keeping Fable 5 safe?
That's the big question: If Fable 5 is Mythos-class, how can you ensure that it's safe to release to the general public? Couldn't a bad actor take advantage of Fable 5's capabilities and force it to discover and disclose security vulnerabilities?
Anthropic says its new guardrails are cautious and conservative, and may be overkill. Benign requests may accidentally trip Fable 5's security alarms, but that supposedly happens around 5% of the time. As such, Anthropic says Fable 5 is able to handle requests itself roughly 95% of the time. In addition, the company found that after a bug bounty program, no white hat hacker could find a universal jailbreak (or an exploit to bypass safety protocols) after 1,000 hours of testing. While one organization has made progress in finding one jailbreak, Anthropic says it's confident that its protocols make it impractical for hackers to discover jailbreaks before the company does.
Anthropic is also making a change to its data retention policy for Fable 5 and Mythos 5. With these models, the company will keep your data for 30 days—not for training, but to help protect against future cyberattacks and jailbreaks. Fable 5 and Mythos 5 are both priced the same: $10 per million input tokens, and $50 per million output tokens, which Anthropic says is less than half the price of Mythos Preview.
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