# Anthropic 发布首个 Mythos 系列模型 Claude Fable 5

- 来源：The Verge：AI（RSS）
- 作者：Robert Hart
- 发布时间：2026-06-10 01:00
- AIHOT 分数：77
- AIHOT 链接：https://aihot.virxact.com/items/cmq6wf6wd0070slbhy2irqwkt
- 原文链接：https://www.theverge.com/news/946725/anthropic-releases-claude-fable-5-mythos

## AI 摘要

Anthropic 发布 Claude Fable 5，称其为迄今广泛可用的最强模型。该模型在软件工程、知识工作与视觉任务中表现突出，且随着任务变长、变复杂，领先优势进一步扩大。Fable 5 是 Anthropic 首次大规模发布的 Mythos 类 AI 模型，此前该公司因该类模型在网络安全任务中能力过强、风险过高而未公开。此次发布得益于新增的安全措施，可在特定高风险领域阻止模型生成响应。

## 正文

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AI

Anthropic

Anthropic releases its first Mythos-class model Claude Fable

It says new safeguards make it possible to release a Mythos-class model it previously said was too risky to make public.

It says new safeguards make it possible to release a Mythos-class model it previously said was too risky to make public.

Anthropic just announced Claude Fable 5, a new AI model it said is the most powerful model it has ever made widely available.

According to the company, Fable 5 “shows exceptional performance in software engineering, knowledge work, and vision,” with its lead over other models growing as tasks become longer and more complex.

Fable 5 marks the first broad release from Anthropic’s Mythos class of AI models, after the company said the family was so capable at cybersecurity tasks that it was too dangerous to release publicly. Anthropic said the release was “made possible by new safeguards that block responses in specific high-risk areas,” with the system falling back to Claude Opus 4.8 — a model it praised for “honesty” when it launched last month.

Anthropic singled out cybersecurity and biology as two domains where the safeguards may block responses, both areas widely considered sensitive topics for advanced AI systems. The company said that in testing, 95 percent of Fable sessions ran entirely on Fable responses, without falling back to Opus 4.8.

The company is also releasing Claude Mythos 5, but provided few details on what that means. In a blog, Anthropic said Mythos 5 is the same underlying model as Fable 5, “but with the safeguards lifted in some areas.” For now, access appears limited to the steadily expanding group of organizations granted access to Claude Mythos Preview through Anthropic’s — not entirely watertight — private Project Glasswing initiative. Those users will be able to upgrade to Mythos 5, Anthropic said, adding that it plans to “expand access over time through a more systematic trusted-access program.”

Anthropic did not respond on the record to The Verge’s request for comment explaining how either model relates to Claude Mythos Preview or why the models are numbered “5” when there do not appear to be any previously released Mythos or Fable models.

Pricing for both models is significantly higher than its former flagship model — double rates for Claude Opus 4.8, though it’s half what users pay for Mythos Preview — at $10 per million input tokens and $50 per million output tokens, Anthropic said.

Robert Hart

AI

Anthropic

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