Opus Rental Mode

Anthropic unveiled the advisor strategy. By pairing Opus as advisor with Sonnet/Haiku as executor, the low-cost model handles execution, and Opus provides plan / correction / stop signal only at points where things get stuck.

• As Claude Platform's advisor tool, it can be applied with just a single change within an API call.
• The advisor does not call tools directly and does not output results directly to the user; the executor continues to proceed based on shared context.
• In official evaluations, Sonnet + Opus advisor showed SWE-bench Multilingual +2.7pp and 11.9% cost reduction per task.
• Haiku + Opus advisor achieved BrowseComp 41.2%, far exceeding the standalone 19.7%, with cost per task reduced by 85%.
• Community reactions are mixed. While there are accounts of seeing 60% API cost savings, concerns have also emerged that when there are many hard decisions, delays and frequent escalations could erode the cost benefits.