What is Sakana AI Fugu Max & Fugu Ultra v2?

Sakana AI says that AI models from different providers tend to be strong in different areas, so people who want several of them often have to manage separate providers and access keys. One research answer is the multi-agent system: a computer system made of several interacting agents, which can solve problems that are difficult or impossible for a single agent to solve. Sakana Fugu, from Sakana AI, is described by its maker as packaging this idea as one model reached through a single API (a way for software to call a service) that chooses and coordinates a pool of other models for each task. The maker describes Fugu Max as orchestrating its largest pool of open and specialized models so far (open meaning models whose weights are published), and Fugu Ultra v2 as aimed at complex, multi-step tasks. Sakana says Fugu is grounded in two 2026 ICLR research papers, TRINITY and the Conductor.

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