Fugu Ultra API

sakana/fugu-ultra
Fugu Ultra delivers frontier-level performance through learned multi-agent orchestration, combining dynamic agent coordination with superior reasoning, coding, and research capabilities.
Context
1M tokens
Input
$6.877 / 1M tokens
Output
$41.262 / 1M tokens
Released
Jun 24, 2026

How to use Fugu Ultra API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to sakana/fugu-ultra.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "sakana/fugu-ultra",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "sakana/fugu-ultra",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"sakana/fugu-ultra","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

Fugu Ultra API Pricing

TypePrice
Input
$6.877 / 1M tokens
Output
$41.262 / 1M tokens
Cached input
$0.6877 / 1M tokens

Fugu Ultra Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
LiveCodeBench
93.2
Contamination-free competitive programming problemsSourceSeptember 21, 2026
Humanity's Last Exam
50.0
Expert-level questions across many domainsSourceSeptember 21, 2026
GPQA Diamond
95.5
Google-proof graduate science questions (hardest subset)SourceSeptember 21, 2026

Fugu Ultra vs other models

ModelInputOutputContextBest for
Fugu Ultra
This page
$6.877 / 1M tokens
$41.262 / 1M tokens
1M tokens
Reasoning + agents
$6.5 / 1M tokens
$39 / 1M tokens
1M tokens
Reasoning + agents
$2.6 / 1M tokens
$13 / 1M tokens
1M tokens
Balanced coding + agents
$3.9 / 1M tokens
$19.5 / 1M tokens
1M tokens
Long-context, multimodal & agentic workflows
$1.95 / 1M tokens
$11.7 / 1M tokens
1M tokens
Reasoning + agents

Frequently asked questions

Fugu Ultra has a 1,000,000 tokens context window and can return up to 128,000 tokens.

Fugu Ultra takes image, text as input and returns text.

Use sakana/fugu-ultra as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

Fugu Ultra became available on June 24, 2026.

Fugu Ultra is priced at input $6.877 / 1M tokens, output $41.262 / 1M tokens, cached input $0.6877 / 1M tokens.

Yes, Fugu Ultra can stream responses as they are generated.

Yes, Fugu Ultra accepts image input alongside text.

Fugu Ultra was built by Sakana AI.

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