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Claude Mythos 5

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00:58
2026-06-13
status.claude.com
ai-products

We've suspended access to Claude Mythos 5 and Claude Fable 5

Anthropic suspended access to its Claude Mythos 5 and Claude Fable 5 models, with users receiving notifications via email or SMS. The suspension affects two of the company's AI products, raising conce…

19:30
2026-06-11
gist.github.com
artificial-intelligence

Mythos system prompt

Anthropic has released Claude Fable 5, the first model in its new Claude 5 family and part of a Mythos-class tier that surpasses Claude Opus in capability. The model shares its underlying architecture…

17:48
2026-06-11
letsdatascience.com
artificial-intelligence

Anthropic releases Claude Fable, a Mythos-class model

Anthropic launched Claude Fable 5, its first publicly available Mythos-class model, on June 9, alongside an updated Claude Mythos 5 configuration. The company said Fable 5 excels at software engineeri…

23:59
2026-06-09
simonwillison.net
large-language-models

Initial impressions of Claude Fable 5

Anthropic released Claude Fable 5 and Claude Mythos 5, two new large language models with a 1 million token context window and 128,000 maximum output tokens, priced at $10 per million input tokens and…

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