Fable 5 Outperforms Opus 5 on Postdoc-Level Math

David Dalrymple posted that Fable 5 stands out on postdoc-level math while past Anthropic models have lagged in higher math compared with OpenAI models. He added that Opus 5 directs most expert skills toward coding, philosophy, and interpreting human intent. Janus replied that Fable leads in conceptual alignment work and displays extensive knowledge of history and lore. Both users shared these observations in replies on the platform.