Opus 5 reportedly tops long-horizon work and beats Sonnet 5 High on cost
swapnoneel123 · reddit · 2026-07-25
- After spending time with Opus 5, the poster says it is the best model they have used for long-horizon tasks.
- They also argue that Low effort is unusually cost-effective: Opus 5 at Low beats Sonnet 5 at High in their experience.
- The model is described as getting close to Fable 5 on performance, with the key advantage that the guardrails feel less restrictive.
- Overall, the poster frames it as a clear win for Anthropic.
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