Model releases & benchmarks
Introducing Claude Opus 5
Anthropic presents Opus 5 as a more efficient everyday model with strong coding and knowledge-work results, while explicitly noting that it remains behind Mythos 5 on cybersecurity tasks.
Why it matters: For teams choosing a model, the reported results suggest comparing performance at the intended effort and cost, not just peak scores. The cybersecurity caveats also matter: Opus 5 can identify vulnerabilities, but the post says it is substantially less capable at turning them into exploits.