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Anthropic Launches Advisor Tool for Claude Platform API Users

·2026.04.10 09:00

Key point

The Claude Platform API now lets you use Opus as an advisor and Sonnet/Haiku as executors.

Details

A new advisor tool has been added to Anthropic's Claude Platform API. Developers can set Opus as the advisor and attach Sonnet or Haiku as the executor, allowing them to leverage higher reasoning capability while keeping operating costs at the level of the more cost-efficient executor models.

This configuration is publicly available through Messages API request settings. In other words, agents can be operated so that complex judgment is delegated to Opus while actual execution is handled by Sonnet or Haiku.

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