Anthropic's Internal Models Reportedly Surpass Mythos 5

Leaks suggest Anthropic has iterated at least three flagship checkpoints beyond Mythos 5, with employees reporting 12x speedups, and a METR chart revealed an unreleased Model 4 scoring 178.6 on the AECI index.

2026-11-06 ~ 2026-11-06 · 2 related posts

• METR chart reveals unreleased Anthropic Model 4 scoring 178.6 on AECI — ResultBackground2450 · 2026-11-06
• Rumor: Anthropic sitting on internal models that top every benchmark with 12x self-reported speedup — teortaxesTex · 2026-11-06