Model comparison

Fugu Max vs Qwen3.8 Max

Pricing, context window and real answers (September 2026)

Fugu Max (Sakana AI) and Qwen3.8 Max (Qwen), compared as you can actually call them on FastMetal. Both are served from the same OpenAI-compatible endpoint and API key; switching is a change to the model string.

Specs and pricing

Fugu Maxqwen logoQwen3.8 Max
ProviderSakana AIQwen
Input (per 1M tokens)¥357.4¥357.4
Output (per 1M tokens)¥1,072.2¥1,072.2
Typical cost (1,000 in + 500 out tokens × 1,000 calls)¥894¥894
Context window1,000,000 tokens1,000,000 tokens
Release date9/11/20268/3/2026
Input modalitiestext, image, filetext, image
Throughput (p50)
Arena · overallUnranked#22 · ELO 1,481
Arena · JapaneseUnranked#18 · ELO 1,469
Arena · codingUnranked#24 · ELO 1,522

Prices are FastMetal's yen rates before tax. Arena ranks are as of the latest leaderboard scrape.

Which should you pick?

  • Output pricing is identical (¥1,072.2 per 1M tokens).
  • If in doubt, try both on the same key. Switching is a change to the model string, and each is billed at its own rate.

Real answers to the same prompts

Exactly what the FastMetal gateway returned, side by side. Not benchmark scores: actual output.

Count the number of 'r's in 'strawberry'

Count the number of 'r's in 'strawberry'. Explain your reasoning step by step.

Fugu Max

The word **“strawberry”** has **3** letters **“r”**. Step by step: 1. Write the word: **s t r a w b e r r y** 2. Check each letter: - s — no - t — no - **r** — yes, 1st - a — no - w — no - b — no - e — no - **r** — yes, 2nd - **r** — yes, 3rd - y — no So, the total number of **‘r’s** in **“strawberry”** is **3**.
3.7s261 output tokens

Qwen3.8 Max

The word **strawberry** is spelled: **s t r a w b e r r y** Now count the letter **r**: 1. s 2. t 3. **r** ← first r 4. a 5. w 6. b 7. e 8. **r** ← second r 9. **r** ← third r 10. y There are **3** letters **r** in **strawberry**.
3.5s156 output tokens

Debug This Error

I'm getting the following error in my Node.js application: TypeError: Cannot read properties of undefined (reading 'map') at UserList (/app/components/UserList.js:12:25) at renderWithHooks (/app/node_modules/rea…

Fugu Max

The error means `users` is `undefined` when `UserList` renders, so `users.map(...)` throws: ```js function UserList({ users }) { // if `users` is not passed, this is undefined return ( <ul> {users.map(user => <li key={user.id}>{user.name}</li>)} </ul> ); } ``` Common causes: 1. Parent renders `<UserList />` without the `users` prop. 2. State is initialized as `undefined`: ```js const [users, setUsers] = useState(); ``` 3. Async data hasn’t loaded yet, but the component already renders. 4. The API returned something unexpected, e.g. `undefined`, an object, or an error response. ## Fixes ### 1. Default the prop to an empty array ```jsx function UserList({ use…
10.6s1293 output tokens

Qwen3.8 Max

The error means `users` is `undefined` when `UserList` tries to render: ```js {users.map(user => ...)} ``` JavaScript cannot call `.map()` on `undefined`, so React throws: ```text Cannot read properties of undefined (reading 'map') ``` ## Most likely cause The parent component is rendering `UserList` without passing a valid `users` array, or it is passing `users` before the data has loaded. For example: ```jsx <UserList /> ``` or: ```jsx <UserList users={undefined} /> ``` or: ```jsx const [users, setUsers] = useState(); // undefined initially ``` Then later: ```jsx <UserList users={users} /> ``` On the first render, `users` is still `undefined`. --- ## Fix 1: Give `users` a d…
17.7s1020 output tokens

Professional Email

Write a professional email to a client explaining that the project delivery will be delayed by two weeks due to unexpected technical challenges discovered during integration testing. The tone should be apologetic but con…

Fugu Max

**Subject:** Project Delivery Timeline Update Dear [Client Name], I’m writing to provide an update on the project delivery timeline. During integration testing, we identified unexpected technical challenges affecting the interaction between several system components. While these issues were not apparent during earlier testing phases, resolving them thoroughly is essential to ensuring a stable and reliable final release. As a result, we need to extend the delivery date by two weeks, moving it from **[original delivery date]** to **[revised delivery date]**. We sincerely apologize for this delay and understand the impact it may have on your plans. We are confident that this additional time…
5.8s391 output tokens

Qwen3.8 Max

Subject: Revised Project Delivery Timeline – Updated Schedule and Next Steps Dear [Client Name], I hope this message finds you well. I am writing to provide an update on the current status of the project and to inform you that, during our recent integration testing phase, we encountered several unexpected technical challenges that will impact the original delivery timeline. After careful review with the technical team, we now anticipate the revised delivery date will be [insert date – two weeks from original delivery date]. Please accept my sincere apologies for this delay. We understand the importance of this project and the expectations tied to the original schedule. While this situati…
11.9s547 output tokens

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Frequently asked questions

Which is cheaper, Fugu Max or Qwen3.8 Max?
Both are ¥1,072.2 per 1M output tokens on FastMetal (yen, before tax).
How do the context windows of Fugu Max and Qwen3.8 Max compare?
Fugu Max takes 1,000,000 tokens; Qwen3.8 Max takes 1,000,000.
Can I use Fugu Max and Qwen3.8 Max with the same API key?
Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "fugu-max" or "qwen3.8-max" as the model. Each is billed at its own rate from the same prepaid balance.

Try both on one API key

Create an account and add credit to call Fugu Max and Qwen3.8 Max from the browser chat and the API. No monthly fee.

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