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 tasks across a swappable pool of underlying models and to recursively call instances of itself. Fugu Ultra prioritizes answer quality on complex, multi-step reasoning, coding, and agentic workflows. It supports configurable reasoning effort, tool calling, and built-in web search. Orchestration tokens consumed by the system are billed as standard input/output tokens.
sakana/fugu-ultra
- Context
- 1M tokens
- Completion cap
- 128,000
- Tools
- Yes
- JSON
- Yes
- Released
- 2026-06-24
Call it from Geek Hub
Same OpenAI SDK. Change the base URL and the model id.
curl https://api.geekhub.mx/v1/chat/completions \
-H "Authorization: Bearer $GEEKHUB_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "sakana/fugu-ultra",
"messages": [{"role": "user", "content": "Hola"}]
}'Frequently asked questions
- 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 tasks across a swappable pool of underlying models and to recursively call instances of itself. Fugu Ultra prioritizes answer quality on complex, multi-step reasoning, coding, and agentic workflows. It supports configurable reasoning effort, tool calling, and built-in web search. Orchestration tokens consumed by the system are billed as standard input/output tokens. Fugu Ultra runs on the Geek Hub API (OpenAI-compatible). Model id: sakana/fugu-ultra.
- Is Fugu Ultra free?
- No. Input is $5.4503 per 1M tokens and output is $32.7018 per 1M tokens on Geek Hub (markup included).
- What is the context length of Fugu Ultra?
- Fugu Ultra has a 1M tokens context window. It supports up to 128,000 completion tokens.
- Does Fugu Ultra support tool calling and structured outputs?
- Fugu Ultra accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
- When was Fugu Ultra released?
- Fugu Ultra was released on 2026-06-24.