@levie: Claude Opus 5 is out now, and it's a huge jump over Opus 4.8 on a wide number of capabilities. At Box, we've been testi…

Claude Opus 5 is out now, and it’s a huge jump over Opus 4.8 on a wide number of capabilities.

At Box, we’ve been testing Claude Opus 5 with the Box AI Agent on Box’s Complex Work Eval, our agentic benchmark that puts models through real enterprise document work end-to-end across a variety of industries. We saw meaningful gains in performance across some of the most complex enterprise tasks on unstructured data.

Here are a few examples of some of the wins we saw in testing:

• Due diligence (+17%): On a transaction due-diligence review, Opus 5 worked through the full set of required findings and flagged the ones Opus 4.8 missed. It stays thorough as the checklist grows instead of catching the obvious items and stopping.

• Life Sciences (+30%): On a target-identification task, it intersected several ranked datasets under a strict matching rule to find the targets common to all of them. Opus 4.8 over-included partial matches and dropped genuine ones.

• Legal (+12%): On a clause-by-clause contract review against a policy, Opus 5 scored every item and correctly cleared the clauses that were acceptable under an exception where Opus 4.8 both missed items and mis-scored the exception.

• Technology (+19%) and Healthcare (+13%) showed the same pattern: complete, precise, multi-step analysis over messy source material.

Overall, the reasoning, analytical, and data processing skills of Opus 5 outshine Opus 4.8 meaningfully. Going to be very powerful for enterprise agentic use-cases. You’ll be able to build agents with Opus 5 in the Box AI Studio shortly.

Claude (@claudeai): Introducing Claude Opus 5.

It’s a thoughtful and proactive model that comes close to the frontier intelligence of Fable 5 at half the price.