Sakana Fugu
VerifiedMulti-agent system from Sakana AI delivered as a single model API
Product preview
Sakana Fugu
What it is
Sakana Fugu is a product from Tokyo-based Sakana AI that packages a multi-agent system as if it were one model. Rather than fixing roles or workflows by hand, Fugu learns to assemble agents from a pool of strong models and coordinate them for each request, an approach grounded in the company's research on learned model orchestration. Developers call it through an OpenAI-compatible API, so existing clients and coding tools work by changing the endpoint and key, and it is also offered through services such as OpenRouter and Vercel AI Gateway. Variants include Fugu, Fugu Ultra, Fugu Max and a security-focused Fugu Cyber. It is not yet available in the EU or EEA.
Key features
- OpenAI-compatible API
- Learned orchestration across many models
- Opt out of specific providers
- Variants for speed, quality and security
What we liked
- + One API instead of many vendor integrations
- + Control over which models join the pool
- + Pay-as-you-go or subscription options
Worth noting
- · Not available in the EU or EEA
- · No free tier mentioned
Editor's notes
More context from AI BirdView
Sakana Fugu takes an unusual angle on the race between model vendors. Instead of training one bigger model, Sakana AI built a system that learns how to combine several existing frontier models and presents the result through a single endpoint. For teams worried about depending on one provider, that design is appealing in its own right.
- Works with existing OpenAI-style clients by swapping the base URL and API key
- Handles model selection and switching per task, which simplifies integrations
- Lets you exclude specific providers or models to meet privacy or compliance needs
- Offers variants tuned for low latency, maximum quality, cost-performance or cybersecurity work
- Builds on two research papers the company presented at ICLR 2026
Fugu is best for developers and engineering teams building coding agents or reasoning-heavy workflows who want strong results without managing several model contracts. A practical tip: start with the default Fugu variant for everyday requests and reserve Fugu Ultra for genuinely hard multi-step problems, since the company notes Ultra trades longer response times for quality and costs more per token.
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