Fugu Ultra — Free AI Chat on Rewind.ai

Chat with Fugu Ultra for free — no signup, no credit card. Sakana's Fugu Ultra runs in your browser on Rewind.ai, with pay-as-you-go tokens and full API access.

What is Fugu Ultra?

Fugu Ultra is the higher-performance model in Sakana AI's Fugu family. Rather than a single monolithic model, Fugu is a learned multi-agent orchestration system: a language model trained to route.

How does Fugu Ultra work?

Type your message in the box above and Fugu Ultra replies instantly — no setup required. Your chat history is saved locally in your browser; sign up free to sync it across devices and get an extra 10,000 tokens. You can switch between Fugu Ultra and other models at any time from the picker at the top.

Is Fugu Ultra free?

Fugu Ultra is pay-as-you-go at $5.00/M input tokens, but you can use it without paying: every visitor gets 2,500 free tokens a day with no sign up, and a free account raises that to 5,000.