Dev Tests Skill Across Opus 5.5 and Sol 6.1: Sol Lags in Instruction Following

Developer Lucas Meijer tested the same skill across Opus 5.5 and Sol 6.1 using multiple frameworks including pi and Claude Code, finding Sol 6.1 lagged significantly in instruction following and ran about 3.5x slower, fueling a rapid shift toward Opus.

2026-10-26 ~ 2026-10-26 · 3 related posts

• Dev testing one skill across Opus 5.5 and Sol 6.1 finds instruction following 'all over the map' — lucasmeijer · 2026-10-26
• Sol61 flunks instruction-following: skips mandated research even when explicitly told — lucasmeijer · 2026-10-26
• Dev benchmarking skills finds Sol at 17 tok/s vs Opus 5.5 at 70 tok/s — lucasmeijer · 2026-10-26