Fugu Ultra
Summary
Fugu Ultra is a proprietary language model from Sakana, released on 15 Jun 2026. It accepts text and images and generates text, with a 1M-token context window and up to 128K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $5 per million input tokens and $30 per million output tokens (OpenRouter), across 2 providers we track.
Quality-first multi-agent model for hard research, analysis, and competitions
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Sakana |
|---|---|
| Release date | 15 Jun 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 1M (1,000,000 tokens) [models.dev] |
| Max output | 128K tokens [models.dev] |
| Input | Text and images [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
Fugu Ultra API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter sakana/fugu-ultra | $5 | $30 | $0.50 | 1M | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway sakana/fugu-ultra | $5 | $30 | $0.50 | 1M | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of Fugu Ultra?
Fugu Ultra has a context window of 1,000,000 tokens (1M) and can generate up to 128,000 tokens in a single response, according to models.dev.
How much does the Fugu Ultra API cost?
Fugu Ultra is listed from $5 per million input tokens and $30 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
Is Fugu Ultra open source?
No. Fugu Ultra is a proprietary model; Sakana has not released its weights. It is available through APIs including OpenRouter, Vercel AI Gateway.
When was Fugu Ultra released?
Sakana released Fugu Ultra on 15 Jun 2026, according to models.dev.
Which providers offer Fugu Ultra?
We track Fugu Ultra on 2 providers: OpenRouter, Vercel AI Gateway.
Change history
No changes detected since we started tracking this model. We re-check every source daily.