Anthropic
Anthropic's current flagship Opus model for complex agentic work, enterprise workflows, advanced coding, and demanding reasoning. It is a proprietary, API-accessible model with a 1M-token context window.
Anthropic's current flagship Opus model for complex agentic work, enterprise workflows, advanced coding, and demanding reasoning.
60.3
Quality Score
1297
Arena ELO
1M
Parameters
1M
Context
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has normalized benchmark rows, so scores here are directly comparable across benchmark sources.
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Jul 2026
Released
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
Introducing Claude Opus 5
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. Performance and cost-effectiveness Claude Opus 5 provides greatly improved performance for the same cost as its predecessor, Opus 4.8. The charts in this section show how performance changes according to the model’s effort setting, which customers can use to optimize for intelligence or conserve tokens for f
View sourceIntroducing Claude Opus 5
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. Performance and cost-effectiveness Claude Opus 5 provides greatly improved performance for the same cost as its predecessor, Opus 4.8. The charts in this section show how performance changes according to the model’s effort setting, which customers can use to optimize for intelligence or conserve tokens for f
View source1297
ELO Score
1286 - 1308
95% Confidence
+/-11 points
3.8K
Battles
Aug 11, 2026
Last Updated