User says Claude Opus 5 still lags, preferring Opus 4.6 in their harness
sachdh · x · 2026-07-29
A user says Claude Opus 5 is not living up to the recursion/self-improvement rhetoric.
- After testing Opus 4.7, they immediately returned to Opus 4.6.
- In their harness, Opus 4.6 + custom tooling allegedly outperforms Opus 4.8 by a wide margin.
- The jab lands directly on Anthropic’s own post about recursive self-improvement and the need to slow frontier AI development.
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