Sakana AI

Fugu Ultra v2 is the high-capability sibling to Fugu Max, released alongside it September 11, 2026. Where Fugu Max optimizes for cost, Fugu Ultra v2 asks 'what is the absolute highest capability achievable on complex, multi-step tasks,' pricing at $5 per million input tokens and $30 per million output tokens at standard context lengths. Sakana reports Fugu Ultra v2 scored 48.3 on the Chartography benchmark against 27.3 for Anthropic's Claude Opus 5 and 29.5 for Claude Fable 5, without including either closed model anywhere in its orchestration pool.

Fugu Max is one of two orchestration models Sakana AI released September 11, 2026. Fugu is not a single monolithic model but a learned orchestrator: it receives one API request, decides which models in its pool should handle the task, and stitches their answers back together. Fugu Max is tuned for the question 'what is the best possible output at the lowest possible cost,' pricing at $2 per million input tokens and $6 per million output tokens, which Sakana claims runs 40-60% below Claude Sonnet 5, GPT-5.6 Terra and Kimi K3.