Anthropic has opened access to Claude Fable 5 and Mythos 5 - ForkLog: cryptocurrencies, AI, singularity, future

ии-стартап Anthropic AI# Anthropic has opened access to Claude Fable 5 and Mythos 5

Anthropic has made the AI models Claude Fable 5 publicly available and launched Claude Mythos 5 for a limited group of partners in Project Glasswing.

Both models are built on the same core architecture. The key difference is that Mythos 5 operates without some standard safety restrictions.

Claude Mythos 5 was deployed as part of Project Glasswing — an initiative for collaboration with the U.S. government. The model is an update to Claude Mythos Preview, which in April was accessible to a select group of cybersecurity experts and critical infrastructure software providers.

In the future, Anthropic plans to provide access to Mythos 5 to individual researchers in biology and trusted access program participants.

The Fable 5 model is available to all users via the Claude API and consumption-based Enterprise plans. In Pro, Max, Team, and seat-based Enterprise subscriptions, its use is free until June 22, 2026. Starting June 23, usage will require credits unless the company extends the grace period.

Fable 5 includes a mechanism to redirect requests related to cybersecurity, biology, chemistry, and model distillation to a more powerful Claude Opus 4.8. According to Anthropic, this fallback triggers in less than 5% of sessions on average.

The cost of using both models is $10 per 1 million input tokens and $50 per 1 million output tokens.

Recall that in May, Anthropic released Claude Opus 4.8 and separately introduced a dynamic workflow function for Claude Code.

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