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Opus 5.5 beats Astra and FABLE 5.1 Anthropic's own mythos class model, how did Anthropic…

Opus 5.5 beats Astra and FABLE 5.1 Anthropic's own mythos class model, how did Anthropic even manage to achieve this…

This is a AI post classified by Jev as Frontier models (a model release), kept by the AI Radar because it carries real work, not commentary.

Opus 5.5 beats Astra and FABLE 5.1 Anthropic's own mythos class model, how did Anthropic even manage to achieve this and that to at a lower cost? it's now ranked #1 in intelligence index AA at half the cost of Astra/fable 5.1

Posted by Tim Jayas (5.3k followers) 1 h ago · 5 likes · 465 views · view the original post on X. Kept by the AI Radar as Frontier models.

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Every post is read and classified by Jev (TypeSafe): what it is, which market it belongs to, and whether the link is a real tool. 42.6k posts from 5k X accounts over the last 14 days, 1.8k tools, 19 markets. Collected every 5 minutes, fully re-ranked every hour — last update 2026-09-22 18:12 UTC. Full method.