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.
More from Models
- Bug Hunt Bench ranks frontier coding models on 105 planted real-repo bugs — PawelHuryn · 2026-09-11
- GPT-6 Astra beats Factorio with enemies in 44 in-game hours at ~$4,500 API cost — liminal_bardo · 2026-09-11
- 105 hidden bugs, 2 repos: DeepSeek V4.1 Flash fixes 24 at $1.80 vs Opus 5's 27 at $51.33 — ChartsJournalX · 2026-09-11
- awesome-llm-leaderboards: an open-source directory of LLM leaderboards, pricing tables, comparison tools — Last_Establishment_1 · 2026-09-11
- Anthropic claims it works to keep eval environments unidentifiable to models — MaxKannen · 2026-09-11
- Nex N2.5 Pro released on Hugging Face with 407GB of weights — jinnyjuice · 2026-09-11