Sakana AI's Fugu Ultra is now accessible via Vercel AI Gateway, callable with a single model string: sakana/fugu-ultra in AI SDK.
Fugu Ultra is not a single model. It routes tasks across 1 to 3 agents drawn from a pool of publicly accessible frontier models, then merges their outputs into one response. Benchmarks place it alongside Claude Mythos Preview and Fable 5 on reasoning and scientific tasks. The architecture is the story here: understanding how multi-agent routing affects latency, cost, and answer quality is what makes the full changelog worth reading.
AI Gateway passes through provider pricing with no markup and no platform fee, including on BYOK requests. It adds unified API access, usage tracking, failover, Zero Data Retention support, and per-key budgets on top. Fugu Ultra is available now in the model playground at vercel.com/ai-gateway/models/fugu-ultra.
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