Claude 3.5 Sonnet Tops Updated EpochAI MirrorCode Leaderboard

EpochAI updated its MirrorCode leaderboard, with Claude Fable 5 (suspected to be Claude 3.5 Sonnet) ranking first with a 64% solve rate, significantly outperforming GPT-5.6 Sol in long-range tasks.

2026-08-04 ~ 2026-08-04 · 2 related posts

• EpochAI Updates MirrorCode Leaderboard: Claude Fable 5 Leads with 64% Solve Rate — xeophon · 2026-08-04
• EpochAI Updates Leaderboard: Claude Fable 5 Beats GPT-5.6 in Long-Horizon Tasks — Jsevillamol · 2026-08-04