model roundup
Mythos 5
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In 1968 five countries that already had nuclear weapons signed a treaty declaring them too dangerous for anyone else to build. India refused, pointing out the treaty did not say nukes were too dangerous to exist, just too dangerous for new…
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Anthropic purposely made its new Mythos-based models bad at AI research, and developers are fuming (www.businessinsider.com via reddit)
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GPT 5.5 vs Fable/Mythos 5 Tamagotchi Showdown (www.reddit.com via reddit)
Well, how do I start this, I think we first need some important context. Chai: https://preview.redd.it/egngyea5cf6h1.png?width=1080&format=png&auto=webp&s=9ade63fbc584b7fab28dba4914bc3fcb877f557f Hasbullah / Hasbi: https://preview.redd.it/…
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AWS Bedrock to require sharing data with Anthropic for Mythos and future models (news.ycombinator.com)
> For Fable 5, Mythos 5, and future models on Bedrock with similar or higher capability levels, Anthropic will require 30-day retention for all traffic on Mythos-class models. Retaining data for a limited period allows Anthropic to detect…
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From the Anthropic Claude Mythos 5/Fable 5 system card: https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf
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From the Anthropic Claude Mythos 5/Fable 5 system card: https://www.anthropic.com/news/claude-fable-5-mythos-5
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The more I look at Fable 5 the more I think we're witnessing a shift that is much bigger than a single model release. For the last few years every frontier model has been competing on the same axis: intelligence.
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It should be at least 7-8 months until we have an open Fable(not just as good as Fable in benchmarks, but actually as good as Fable), probably more like 9-12 months. By the time, an open Fable model comes out, Fable 6.5-7 will be way bette…
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Fable/Mythos 5 Vending Bench (www.reddit.com via reddit)
could not extract summary
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Claude Fable 5 compared to other models and benchmarks (www.reddit.com via reddit)
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Claude Fable 5 and Mythos 5 pricing: Anthropic's new $10/$50 top tier (www.aipricing.guru via hn)
Claude Fable 5 and Mythos 5 Pricing: Anthropic's New $10/$50 Top Tier Anthropic launched Claude Fable 5 and limited-preview Claude Mythos 5 at $10 input and $50 output per million tokens, with 1M context and 128K max output. By AI Pricing…
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System Card: Claude Fable 5 and Claude Mythos 5 [pdf] (www-cdn.anthropic.com via hn)
System Card: Claude Fable 5 & Claude Mythos 5 June 9, 2026 anthropic.com Executive Summary This system card describes Claude Mythos 5 and Claude Fable 5, two con fi gurations of a new large language model from Anthropic. Because of the pow…
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could not extract summary
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Mythos 5: We're Not Ready (www.reddit.com via reddit)
https://preview.redd.it/58fk4njjwv5h1.png?width=877&format=png&auto=webp&s=e5c28014b15f4901f3752422d61864c53cff25c4 https://x.com/pankajkumar_dev/status/2063625695285084419?s=20 - Mythos is extremely strong at SVG generation, producing hig…
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Mythos 5 slug briefly appeared before removal (www.reddit.comhttps)
Release could be imminent, but what this tells us is they'll likely brand it as Claude 5.