Qwen3.8 27B vs Qwen3.8 Max
Pricing, context window and real answers (August 2026)
Qwen3.8 27B (Qwen) 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
 Qwen3.8 27B | Qwen3.8 Max | |
|---|---|---|
| Provider | Qwen | Qwen |
| Input (per 1M tokens) | ¥80.41 | ¥357.4 |
| Output (per 1M tokens) | ¥571.84 | ¥1,072.2 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥366 | ¥894 |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Release date | 8/14/2026 | 8/3/2026 |
| Input modalities | text, image, video | text, image |
| Arena · overall | #87 · ELO 1,436 | #20 · ELO 1,479 |
| Arena · Japanese | Unranked | #14 · ELO 1,485 |
| Arena · coding | #67 · ELO 1,498 | #26 · ELO 1,520 |
Prices are FastMetal's yen rates before tax. Arena ranks are as of the latest leaderboard scrape.
Which should you pick?
- On price, Qwen3.8 27B: ¥571.84 per 1M output tokens, 47% less than Qwen3.8 Max.
- On the Overall arena board, Qwen3.8 Max ranks higher (#20; Qwen3.8 27B is #87).
- On the Coding arena board, Qwen3.8 Max ranks higher (#26; Qwen3.8 27B is #67).
- 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.
Qwen3.8 27B
The word is: **strawberry**
Break it into letters:
1. s
2. t
3. r
4. a
5. w
6. b
7. e
8. r
9. r
10. y
Now count the **r**’s:
- 3rd letter: **r**
- 8th letter: **r**
- 9th letter: **r**
So, there are **3** r’s in **strawberry**.
3.6s239 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…
Qwen3.8 27B
The error means that `users` is `undefined` when `UserList` renders:
```jsx
{users.map(...)}
```
JavaScript cannot call `.map()` on `undefined`.
For example, this would cause the error:
```jsx
<UserList />
```
because `users` is not being passed in.
## Simple fix: give `users` a default value
```jsx
function UserList({ users = [] }) {
return (
<ul>
{users.map(user => <li key={user.id}>{user.name}</li>)}
</ul>
);
}
```
Now if `users` is not passed in, it defaults to an empty array.
## Better fix: make sure the parent passes an array
Wherever you use `UserList`, pass `users`:
```jsx
<UserList users={users} />
```
If `users` comes from an API or state, make sure it…
9.5s601 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…
Qwen3.8 27B
Subject: Project Delivery Update – Revised Timeline and Mitigation Plan
Dear [Client Name],
I hope this message finds you well. I’m writing to provide a timely update regarding the status of the [Project Name] and to communicate a revised delivery timeline.
During the recent integration testing phase, we identified unexpected technical challenges that require additional time to resolve. While these issues are complex, we have a clear path forward and the necessary resources in place to address them. Based on our current assessment, we expect the project delivery to be delayed by two weeks.
We sincerely apologize for any inconvenience this may cause. We fully understand the importance of…
16.3s763 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
Frequently asked questions
- Which is cheaper, Qwen3.8 27B or Qwen3.8 Max?
- Per 1M output tokens, Qwen3.8 27B is ¥571.84 and Qwen3.8 Max is ¥1,072.2 on FastMetal (yen, before tax), so Qwen3.8 27B is cheaper.
- How do the context windows of Qwen3.8 27B and Qwen3.8 Max compare?
- Qwen3.8 27B takes 1,000,000 tokens; Qwen3.8 Max takes 1,000,000.
- Which ranks higher, Qwen3.8 27B or Qwen3.8 Max?
- Qwen3.8 Max ranks higher on the public arena (Qwen3.8 27B #87, Qwen3.8 Max #14). Ranks move as the leaderboard updates.
- Can I use Qwen3.8 27B and Qwen3.8 Max with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "qwen3.8-27b" 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 Qwen3.8 27B and Qwen3.8 Max from the browser chat and the API. No monthly fee.