Advisor API

Pair Opus as an advisor with Sonnet or Haiku as the executor in your own agents via the API. Near Opus-level intelligence at a fraction of the cost.

Sonnet + Opus advisor scored 2.7 points higher on SWE-bench Multilingual than Sonnet alone
11.9% lower cost per task compared to Sonnet alone
Now in beta on the Claude Platform
Works with Sonnet or Haiku as executor models

Production agents where most requests are routine but some require deeper reasoning to get right

Your agent's error rate on edge cases is too high with Sonnet alone, but running everything through Opus is too expensive

Teams already building on the Claude API who want to improve agent quality without scaling their compute budget linearly

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Anthropicapi

April 10, 2026·Source

Pair Opus as an advisor with Sonnet or Haiku as the executor in your own agents via the API. Near Opus-level intelligence at a fraction of the cost.

Sonnet + Opus advisor scored 2.7 points higher on SWE-bench Multilingual than Sonnet alone
11.9% lower cost per task compared to Sonnet alone
Now in beta on the Claude Platform
Works with Sonnet or Haiku as executor models

Production agents where most requests are routine but some require deeper reasoning to get right

Your agent's error rate on edge cases is too high with Sonnet alone, but running everything through Opus is too expensive

Teams already building on the Claude API who want to improve agent quality without scaling their compute budget linearly

Pick a topic and leave with something you created.

Get new module drops and weekly AI strategy.