Anthropic Rolls Out Opus 5 Today With Token Efficiency Focus

Today, Anthropic rolled out Opus 5, according to its official announcement. The model performs at roughly the same level as Anthropic's Fable model on coding tasks while costing approximately half as much, and it outperforms Opus 4.8 and OpenAI's GPT-5.6-Sol across most benchmarks. However, the performance gains are incremental rather than a major leap. Anthropic intentionally limited Opus 5's training on cybersecurity tasks, leaving it substantially behind Fable and Mythos in vulnerability exploitation capabilities, though it remains capable of identifying security vulnerabilities.
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