We're still waiting for Fable 5.5, meanwhile Anthropic has already trained THREE newer…
This is a AI post classified by AGK Intelligence as Frontier models (a model release), kept by the AI Radar because it carries real work, not commentary.
We're still waiting for Fable 5.5, meanwhile Anthropic has already trained THREE newer models after Claude Mythos Preview. METR's new report gives us a glimpse into Anthropic's unreleased models, and the progression is insane. Here's the timeline after Claude Mythos Preview: - Model 2: Trained in July 2026 - Model 3: Trained in Aug–Sep 2026 - Model 4: Trained in Sep–Oct 2026 Model 4 scored above 50% on ALL 15 benchmarks in Anthropic's internal capability index (AECI). For context, just 9 months earlier, Opus 4.6 was still below 50% on many of those same tests. METR is now concerned that
Posted by Veee (12.3k followers) 7 h ago · 26 likes · 1.2k views · view the original post on X. Kept by the AI Radar as Frontier models.
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