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Sakana AI

Fugu Ultra

Fugu Ultra is Sakana AI's quality-maximizing multi-agent system released June 21, 2026. Behind a single model API, Fugu Ultra coordinates a pool of expert agents to solve hard, multi-step problems. Available through AI Gateway with unified billing, observability, and provider routing.

Vision (Image)Tool UseReasoning
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'sakana/fugu-ultra',
  prompt: 'Why is the sky blue?'
})
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