Sakana: Fugu Ultra

Sakana: Fugu Ultra is a paid text-and-image model from Sakana with a 1,000,000-token context window and a 128,000-token output ceiling. It supports tool use and reasoning, which makes it usable for agentic workflows and multi-step tasks. Structured output support is unconfirmed, so developers who depend on guaranteed JSON schemas should verify that before committing. The comparison problem here is straightforward: at $5.00 per million input tokens and $30.00 per million output tokens, Fugu Ultra sits at a premium price point, yet it carries no independent benchmark coverage at this time. Buyers cannot weigh that cost against verified performance scores. Teams exploring very long context processing or reasoning-heavy pipelines may still find it worth piloting, but anyone budgeting carefully or comparing against established models should treat its quality as unproven until third-party evaluations are available.