Introducing Claude Opus 5
Opus 5 is a step change improvement for the Opus tier powering long-running agents while delivering improvements in coding and professional work. Product Announcements Introducing Claude Opus 5 Jul 24, 2026 Claude Opus 5 is available today. It's a thoughtful and proactive model that comes close to the frontier intelligence of Claude Fable 5 at half the price.
Key Takeaways
- On coding and knowledge work evaluations like Frontier-Bench and GDPval-AA , Opus 5 is the new state-of-the-art, though it remains behind Mythos 5 on cybersecurity tasks.
Opus 5 is designed to be used every day: it works more efficiently than other models.
- Opus 5 excels on valuable software engineering tasks.
For example, on Frontier-Bench v0.1, Opus 5 surpasses all other models, and more than doubles Opus 4.8's performance at a lower cost per task.
- On Zapier AutomationBench , which measures whether models can complete business tasks from start to finish, Opus 5's pass rate is around 1.5× the next-best model for the same cost per task.
Even at its lowest effort setting, Opus 5 passes more tasks than any other model.
- Its improvements are most notable on organic chemistry tasks, like inferring molecular structures from spectroscopy data (it scores 10.2 percentage points higher than Opus 4.8 on our internal benchmark), and on protein-related tasks like predicting how variations in a protein's sequence affect how it functions (here, it scores 7.7 percentage points higher).
Finally, Opus 5 is capable of producing much stronger visual outputs: Wind tunnel Cell artifact Working with Claude Opus 5 Claude Opus 5 is much stronger at verifying its work and iterating carefully until it succeeds.
- Given a real bug in a popular open-source package manager, Opus 5 found the root cause and fixed an edge case that the community's patch had missed.
Stats & Key Facts
- #Its improvements are most notable on organic chemistry tasks, like inferring molecular structures from spectroscopy data (it scores 10.2 percentage points higher than Opus 4.8 on our internal benchmark), and on protein-related tasks like predicting how variations in a protein's sequence affect how it functions (here, it scores 7.7 percentage points higher).
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