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OpenKey

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...

Try in playground
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 tokensProvider+ 3% feeYou 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.

Code sample language
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.