Reddit user: Sonnet got lazy, Opus is the new default for reasoning
Worldly_Pea326 · reddit · 2026-10-20
A Reddit user with 2 years of Claude experience reports that Sonnet has been giving noticeably lazy answers to everyday reasoning tasks over the past few months, and that switching to Opus restored quality — prompting the question 'when did Opus become the new Sonnet?' This is user-side behavioral observation, not an official change, but a useful community signal on Anthropic's default model tiers.
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