Fugu Ultra
Sakana AIReleased Jun 24, 2026
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...
- Context window
- 1M tokens
- Max output
- 128K tokens
- Input
- text, image
- Output
- text
- Tokenizer
- Other
- Released
- Jun 24, 2026
- Reasoning
- always on
Pricing
Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.
| Per 1M tokens | Provider | + 3% fee | You pay |
|---|---|---|---|
| Input | $5.00 | $0.150 | $5.15 |
| Output | $30.00 | $0.900 | $30.90 |
| Cache read | $0.500 | $0.015 | $0.515 |
Supported parameters
- include_reasoning
- reasoning
- structured_outputs
- tool_choice
- tools
- web_search_options
Call it
OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model sakana/fugu-ultra.
curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "sakana/fugu-ultra",
"messages": [{"role": "user", "content": "Hello"}]
}'import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.openkey.ai/v1",
api_key=os.environ["OPENKEY_API_KEY"],
)
completion = client.chat.completions.create(
model="sakana/fugu-ultra",
messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.openkey.ai/v1",
apiKey: process.env.OPENKEY_API_KEY,
});
const completion = await client.chat.completions.create({
model: "sakana/fugu-ultra",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does Fugu Ultra cost via API?
- Through OpenKey, Fugu Ultra costs $5.15 per 1M input tokens and $30.90 per 1M output tokens. That is the provider price ($5.00 / $30.00) plus a flat 3% fee — nothing else.
- What is Fugu Ultra's context window?
- Fugu Ultra accepts up to 1M tokens of context and returns up to 128K tokens per request.
- Is Fugu Ultra OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "sakana/fugu-ultra" using any OpenAI SDK — only the base URL and API key change.
- What inputs does Fugu Ultra support?
- Fugu Ultra accepts text, image input and produces text output.