Fugu Max

Not rated yet. Independent test results usually appear a few weeks after a model is released.

Benchmark data: Epoch AI, licensed CC BY 4.0

Companies that serve this model through an API: 1. Prices per million tokens, cheapest first.

Availability and prices come from OpenRouter’s public API and are refreshed daily. Uptime is the share of successful requests over the last 24 hours. Some providers run a compressed version of open models (fp8, int4), which is cheaper but can be slightly less accurate.

Call Fugu Max through OpenRouter’s OpenAI-compatible API: create a key on openrouter.ai, then run one of these examples.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "sakana/fugu-max", "messages": [{"role": "user", "content": "Hello! What can you do?"}]}'

import os
from openai import OpenAI

client = OpenAI(base_url="https://openrouter.ai/api/v1", api_key=os.environ["OPENROUTER_API_KEY"])
reply = client.chat.completions.create(
    model="sakana/fugu-max",
    messages=[{"role": "user", "content": "Hello! What can you do?"}],
)
print(reply.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({ baseURL: "https://openrouter.ai/api/v1", apiKey: process.env.OPENROUTER_API_KEY });
const reply = await client.chat.completions.create({
  model: "sakana/fugu-max",
  messages: [{ role: "user", content: "Hello! What can you do?" }],
});
console.log(reply.choices[0].message.content);

The same code works with every model on this site: only the model ID changes. Many labs also offer their own API and SDK.

• 1,000 chat replies

  ≈ 500 tokens in, 300 out each
  $2.80
• Summarise a 100-page document

  ≈ 50,000 tokens in, 1,000 out
  $0.106
• An app with 10,000 requests a day for a month

  ≈ 1,000 tokens in, 400 out each
  $1,320

Cost calculator →

How much does Fugu Max cost?

Fugu Max costs $2 per million input tokens and $6 per million output tokens through the API. For example, 1,000 chat replies of about 500 tokens in and 300 out cost around $2.80.

What is the context window of Fugu Max?

Fugu Max can read up to 1,000,000 tokens in one request, about 1,875 pages of text. It can write up to 128,000 tokens in a single answer.

Is Fugu Max open source?

No. Fugu Max is a closed model: its weights are not published, so you use it through Sakana AI’s own apps and API, or through cloud providers.

Who makes Fugu Max?

Fugu Max is made by Sakana AI. It became available through the API on September 11, 2026.

Can Fugu Max read images?

Yes. Besides text, it accepts images and files such as PDFs as input.

What are the alternatives to Fugu Max?

Models with a similar price from other companies include GPT-6.1 Sol Pro, Claude Sonnet 5.5 and Grok 4.7. You can compare them side by side on this page.