Fugu Ultra is an AI model by Sakana. Fugu Ultra is the higher-performance model in Sakana AI's Fugu family.

How much does Fugu Ultra cost on Zeplik?

Input tokens cost 60.0 credits per million and output tokens 360 credits per million (1 credit = $0.10; the raw provider rates are $5.00 and $30.00 per million). New accounts start with free credits.

How long can a conversation with Fugu Ultra be?

Fugu Ultra has a 1M-token context window (1,000,000 tokens), which covers the conversation plus any documents you attach.

Does Fugu Ultra support images and tools?

Fugu Ultra accepts image input and supports tool calling.

Fugu Ultra

FrontierVisionTools

Sakana · Released June 2026

Fugu Ultra is the higher-performance model in Sakana AI's Fugu family.

It comes from Sakana AI, a Tokyo lab researching nature-inspired model architectures, whose Fugu line orchestrates several models rather than serving one.

Facts and pricing

Provider: Sakana
Context window: 1M tokens
Input price: 60.0 credits / 1M tokens ($5.00 raw)
Output price: 360 credits / 1M tokens ($30.00 raw)
Vision (image input): Yes
Tool calling: Yes
Extended reasoning: No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

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Or open Zeplik with Fugu Ultra already selected

What Fugu Ultra is best for

Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
Very long documents and codebases: a 1M-token window fits entire books or repositories in one conversation
Working with images: screenshots, charts, photos and scanned documents alongside text
Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a frontier model like Fugu Ultra:

Review this business plan and give me the three hardest questions an investor would ask
Rewrite this announcement so it lands with both engineers and executives
I am choosing between two job offers, help me think through the tradeoffs
Draft a technical design doc for a rate limiter, including failure modes

Sakana family

Model	Context	Input cr/M	Output cr/M	Released
Fugu Ultra v2	1M	60.0	360	September 2026
Fugu Max	1M	24.0	72.0	September 2026
Fugu Ultra	1M	60.0	360	June 2026

Model comparisons

Frequently asked questions

What is Fugu Ultra?: Fugu Ultra is an AI model by Sakana. Fugu Ultra is the higher-performance model in Sakana AI's Fugu family.
How much does Fugu Ultra cost on Zeplik?: Input tokens cost 60.0 credits per million and output tokens 360 credits per million (1 credit = $0.10; the raw provider rates are $5.00 and $30.00 per million). New accounts start with free credits.
How long can a conversation with Fugu Ultra be?: Fugu Ultra has a 1M-token context window (1,000,000 tokens), which covers the conversation plus any documents you attach.
Does Fugu Ultra support images and tools?: Fugu Ultra accepts image input and supports tool calling.

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