Claude Opus 5 launches with strong coding feedback and mixed benchmark signals
Latent Space · rss · 2026-07-25
Anthropic’s Claude Opus 5 launches with benchmark and user feedback that paint a mixed but strong picture.
- Epoch reports ECI 159 for Opus 5, slightly below Fable 5’s 161, while its SWE-ECI is 161, matching Fable 5 on software engineering.
- Early users describe the model as materially better in real work than public scores suggest, especially for coding and browser/tool use.
- One evaluator noted an oddity on FrontierCode: medium-effort runs outperformed higher-effort ones, hinting that more inference-time compute is not always better.
- Other reactions praise best-of-n coding results, browser automation, and practical agentic behavior, though some of that is anecdotal rather than systematic.
More from Models
- supermemory unveils learner-1, claiming continual learning for any model — julianweisser · 2026-10-26
- Anthropic says Opus 5.5 cuts cost per task by ~40% vs Opus 5 — taufiqintech · 2026-10-26
- AI search APIs ranked: top 12 within 7 points, yet prices differ nearly 7x — FinanceYF5 · 2026-10-26
- OpenAI Dots coming to EU/EEA and UK in a few weeks, slides confirm — testingcatalog · 2026-10-26
- OpenAI Dots demoed live as EU launch speculated, Codex adoption in Germany revealed — testingcatalog · 2026-10-26
- "Abliterated models just have brain damage" — community pushes back on unaligned model hype — dhadfieldmenell · 2026-10-26