Sakana AI: Fugu Ultra
Fugu Ultra is a reasoning model from Sakana AI released on Jun 15, 2026. It reads text and images and writes text, with a 1M token context window and up to 1M tokens per reply.
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It costs $5 per million input tokens and $30 per million output tokens. Cached input bills at $0.50, 90% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
12 providers serve it, including Vercel AI Gateway, DevPass (LLM Gateway) and Kilo Gateway.
- Modalities
- In / out price
- $5 / $30 per 1M
- Context
- 1M
- Max output
- 1M
- Released
- Jun 15, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Fugu Ultra pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $5 / 1M tokens | |
|---|---|---|
| Output | $30 / 1M tokens | |
| Cached input (read) | $0.50 / 1M tokens | 90% off input |
| Prompts over 200K | $10 in, $45 out | long context rate |
| Prompts over 272K | $10 in, $45 out | long context rate |
Fugu Ultra providers
12 providers serve it, including Vercel AI Gateway, DevPass (LLM Gateway) and Kilo Gateway. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Sakana AI First party | $5 | $30 | $0.50 | 1M | 1M |
| Vercel AI Gateway | $5 | $30 | $0.50 | 1M | 1M |
| DevPass (LLM Gateway) | $5 | $30 | $0.50 | 1M | 1M |
| Kilo Gateway | $5 | $30 | $0.50 | 1M | 128K |
| LLM Gateway | $5 | $30 | $0.50 | 1M | 1M |
| LLMTR | $5 | $30 | – | 1M | 1M |
| Merge Gateway | $5 | $30 | $0.50 | 1M | 128K |
| NanoGPT | $5 | $30 | $0.50 | 1M | 16K |
| Pioneer | $5 | $30 | $0.50 | 1M | 131K |
| Requesty | $5 | $30 | $0.50 | 1.05M | 131K |
| AI/ML API | $6.88 | $41.26 | $0.6877 | 1M | 128K |
| EmpirioLabs AI | $7.50 | $45 | $1.50 | 1M | 131K |
What Fugu Ultra costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Fugu Ultra through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning
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Fugu Ultra questions
How much does the Fugu Ultra API cost?
$5 per million input tokens and $30 per million output tokens, with cached input at $0.50. Prompts over 200K tokens bill at $10 input and $45 output. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Fugu Ultra?
1,000,000 tokens of input, and it can write up to 1,000,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Fugu Ultra?
12 providers serve it, including Vercel AI Gateway, DevPass (LLM Gateway) and Kilo Gateway. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Fugu Ultra support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Fugu Ultra open source?
No. Sakana AI serves it through an API only, so you cannot download the weights or host it yourself.
When was Fugu Ultra released?
Jun 15, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.