Anthropic paper table shows an internal model (AECI 178.78) beating all released Claude models

kimmonismus · x · 2026-11-10

A capability-index table from an Anthropic paper lists an "Internal Model" scoring 178.78 on AECI, above every released Claude model (Mythos 5.2 at 177.12, Opus 5.5 at 174.78). The poster reads this as evidence Anthropic has a significantly better model deployed internally but not yet shipped publicly.

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