Sakana: Fugu Ultra
sakana/fugu-ultra · SakanaNot yet established- Declared family
- Unknown
- Evidence confidence
- Unknown
- Declared tokenizer tag
- Other
- Entered catalogue
- 24 June 2026
- Last tested
- Not yet measured
- Measurement
- Awaiting measurement
Evidence stack
Signals of different kinds, weighed together| Signal | Result | Reference |
|---|---|---|
| Tokenizer signature | Not measured | – |
| API surface | No other entry shares this exact contract | api_956e60ef |
| Context and output | 1,000,000 context · 128,000 max output | declared |
| Reasoning contract | Mandatory · efforts max, xhigh, high · default xhigh | declared |
| Serving providers observed | None recorded yet | – |
Declared record
What the catalogue claims about this modelFugu 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...
- Modalities
- text+image->text
- Declared tokenizer
- Other
- Prompt price
- $5.00 / M tokens
- Completion price
- $30.0 / M tokens
Supported parameters
include_reasoningreasoningreasoning_effortstructured_outputstool_choicetoolsweb_search_options
defaults: {"temperature":null,"top_p":null,"top_k":null,"frequency_penalty":null,"presence_penalty":null,"repetition_penalty":null}
History
Every observation, kept as taken- 24 June 2026Enters the OpenRouter catalogue with no declared family.
Cite this page as the evidence record for Sakana: Fugu Ultra: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.