Why hackers moved from Claude Opus 5 to Claude Sonnet 5
1 hacker described this switch in public comments. Their words, with links to the originals.
What hackers said about the move
“I switched from Opus 5 to Sonnet 5 on a project of another customer and I didn't notice a decrease in quality.”pmontra, 2026-08-13original comment ↗
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Claude Opus 5 vs Claude Sonnet 5
| Claude Opus 5 | Claude Sonnet 5 | |
|---|---|---|
| Hackers who recommend | 3 | 2 |
| Hackers who criticize | 3 | 0 |
| Moved away from it | 2 | 0 |
| Moved to it | 3 | 2 |
Counts are distinct hackers in the sampled comments, not market share.
Criticism of Claude Opus 5
“I swear I've noticed a sustained and consistent degradation in intelligence of Opus 5 since its launch.”Gareth321, 2026-08-15original comment ↗
“I recently caught Opus 5 hallucinating about code it just wrote.”ilitirit, 2026-08-14original comment ↗
Praise for Claude Sonnet 5
“I switched from Opus models to sonnet 5 and haven’t noticed any drop in quality on large repos.”mulhoon, 2026-07-24original comment ↗