METR report reveals Anthropic's internal Model 4: trained Oct 2026, scores 178.6 on ECI
legit_api · x · 2026-11-06
METR published a report on its assessment, using internal Anthropic information, of whether AI is accelerating AI development. Key leaked details:
- Anthropic's internal Model 4 finished training in October 2026
- Scores 178.6 on the Anthropic ECI — 9.24 ECI above Opus 5.5, roughly 7.5 months of frontier progress
- Model 2 finished July 2026, Model 3 in Aug–Sep, Model 4 in Sep–Oct
Third-party relay of internal eval info; see METR's original report for details.
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