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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.
from openai import OpenAI client = OpenAI( base_url="https://api.respan.ai/api/", api_key="YOUR_RESPAN_API_KEY",) response = client.chat.completions.create( model="openrouter/sakana/fugu-ultra", messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)from openai import OpenAI client = OpenAI( base_url="https://api.respan.ai/api/", api_key="YOUR_RESPAN_API_KEY",) response = client.chat.completions.create( model="openrouter/sakana/fugu-ultra", messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)Gateway routes for this model on the Respan gateway, including fallback routes when configured.
| Model | Capabilities | ||||||
|---|---|---|---|---|---|---|---|
| openrouter/sakana/fugu-ultra | 1M | $5.00/M | $30.00/M | Read:$0.50/MWrite:$0.00/M | 5.4s | +2 | 6tps |
Other models from the same provider available through the gateway.
| Model | Capabilities | ||||||
|---|---|---|---|---|---|---|---|
| openrouter/~anthropic/claude-fable-latest | 1M | $10.00/M | $50.00/M | Read:$0.25/MWrite:$12.50/M | 3.2s | +2 | 4tps |
| openrouter/~anthropic/claude-haiku-latest | 200K | $1.00/M | $5.00/M | Read:$0.10/MWrite:$1.25/M | 0.7s | +2 | 23tps |
| openrouter/~anthropic/claude-opus-latest | 1M | $4.00/M | $20.00/M | Read:$0.20/MWrite:$5.00/M | 3.4s | +2 | 16tps |
| openrouter/~anthropic/claude-sonnet-latest | 1M | $2.00/M | $10.00/M | Read:$0.20/MWrite:$2.50/M | 7.0s | +2 | 67tps |
| openrouter/~deepseek/deepseek-flash-latest | 1.0M | $0.04/M | $1.00/M | Read:$0.01/MWrite:$0.00/M | 2.0s | +2 | 25tps |
| openrouter/~deepseek/deepseek-pro-latest | 1.0M | $0.39/M | $2.90/M | Read:$0.25/MWrite:$0.00/M | 2.0s | 13tps | |
| openrouter/~deepseek/deepseek-v4-flash-latest | 1.3M | $0.03/M | $0.32/M | Read:$0.02/MWrite:$0.00/M | 11s | 130tps | |
| openrouter/~google/gemini-flash-latest | 1.0M | $0.75/M | $3.75/M | Read:$0.07/MWrite:$0.04/M | 1.7s | +2 | 43tps |
| openrouter/~google/gemini-pro-latest | 1.0M | $2.00/M | $12.00/M | Read:$0.20/MWrite:$0.38/M | 2.1s | +2 | 29tps |
| openrouter/~moonshotai/kimi-latest | 1.0M | $1.40/M | $10.75/M | Read:$0.30/MWrite:$0.00/M | 2.4s | +2 | 27tps |
| openrouter/~openai/gpt-astra-latest | 1.1M | $10.00/M | $50.00/M | Read:$1.00/MWrite:$12.50/M | 1.8s | +2 | 6tps |
| openrouter/~openai/gpt-luna-latest | 1.1M | $0.10/M | $0.50/M | Read:$0.01/MWrite:$0.13/M | 0.9s | +2 | 15tps |
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Use Respan with your favorite frameworks and tools.