Claude Opus 5.5

HackerNews discussion (89 comments, top 25 by upvotes shown) is dominated by developers running Opus 5.5 in Claude Code/Codex against rival models. Capability signal: one heavy user of Fable, Astra, Opus 5 and Sol 5.6 says 'with this release Opus 5.5 might be the one' daily driver, noting Fable is 'a class of its own' at coding/orchestration but 'runs out pretty quick and is prohibitively expensive and slow.' Another top comment is simply 'Much better than Opus 5,' citing a correct, brief explanation of a scheduler's correctness details. Reasoning-tier economics is the hottest topic: users report Medium effort is the sweet spot ('At high and above, models tend to generate more output... with no real benefit'), that Opus 5.5 [Medium] 'can make sense dollar per intelligence... puts some other models to shame,' while [Max] cost is 'completely unhinged' — Simon Willison-style pelican-on-a-bicycle SVG tests failed twice at max because the model 'ran out of the 128,000 token budget while it was still reasoning' (all lower levels produced a correctly shaped bicycle frame; xhigh had 'a better beak'). Benchmark distrust recurs: 'Aren't all of these models trained to ace these benchmarks? I'm increasingly looking to real world feedback.' One user measured ~50% completion-time variance between identical runs of the same model; another saw Sol 5.6 bug-finding drop from 40-50 to 25 per set between runs two weeks apart (a sibling model, but it colors trust), with calls for repeat-testing given 'performance fall-off after a couple of weeks.' Style complaints: Claude's 'flowery language,' forced coinages and neologisms annoy daily users ('true, but insufferable'). Anthropic's negative framing of distillation also drew pushback ('Distillation is amazing'). Value shoppers in-thread lean to alternatives — DeepSeek v4.1 called a 'relentlessly hardworking dirt cheap model,' and '5.6 Luna' praised for 'insane' dollar-per-work — while conceding Opus 5.5's ceiling is higher.

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