Qwen3.8 2.4T A95B vs Qwen3.8 27B
Pricing, context window and real answers (August 2026)
Qwen3.8 2.4T A95B (Qwen) and Qwen3.8 27B (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 2.4T A95B | Qwen3.8 27B | |
|---|---|---|
| Provider | Qwen | Qwen |
| Input (per 1M tokens) | ¥351.83 | ¥80.41 |
| Output (per 1M tokens) | ¥1,055.5 | ¥571.84 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥880 | ¥366 |
| Context window | 1,048,576 tokens | 1,000,000 tokens |
| Release date | 8/12/2026 | 8/14/2026 |
| Input modalities | text | text, image, video |
| Arena · overall | Unranked | #87 · ELO 1,436 |
| Arena · Japanese | Unranked | Unranked |
| Arena · coding | Unranked | #67 · ELO 1,498 |
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, 46% less than Qwen3.8 2.4T A95B.
- For long documents, Qwen3.8 2.4T A95B: a 1,048,576-token context window against 1,000,000 for Qwen3.8 27B.
- 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 2.4T A95B
To count the number of **“r”**s in **“strawberry”**, spell it out letter by letter:
**s t r a w b e r r y**
Now check each letter:
1. s — not r
2. t — not r
3. r — yes, count 1
4. a — not r
5. w — not r
6. b — not r
7. e — not r
8. r — yes, count 2
9. r — yes, count 3
10. y — not r
So there are **3** “r”s in **strawberry**.
1.3s203 output tokens
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
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 2.4T A95B
The error happens because `users` is `undefined` when React tries to render this line:
```js
{users.map(user => <li key={user.id}>{user.name}</li>)}
```
JavaScript cannot call `.map()` on `undefined`.
In your component:
```js
function UserList({ users }) {
return (
<ul>
{users.map(user => <li key={user.id}>{user.name}</li>)}
</ul>
);
}
```
React expects `users` to be an array, but something is rendering `<UserList />` without providing a valid `users` prop.
---
## Common causes
### 1. The parent component is not passing `users`
For example:
```js
<UserList />
```
Instead of:
```js
<UserList users={users} />
```
---
### 2. The data has not loaded yet
If `users…
10.9s1318 output tokens
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
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 2.4T A95B
Subject: Updated Project Timeline – Revised Delivery Date
Dear [Client Name],
I hope this message finds you well.
I’m writing to provide an important update regarding the delivery timeline for [Project Name]. During our recent integration testing phase, we identified several unexpected technical challenges that require additional resolution to ensure the final deliverable meets the quality and performance standards we committed to.
After carefully reviewing the scope of these items with our technical team, we have determined that the project delivery will need to be extended by two weeks. I sincerely apologize for any inconvenience this may cause. Please be assured that we are taking imm…
4.6s449 output tokens
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
Frequently asked questions
- Which is cheaper, Qwen3.8 2.4T A95B or Qwen3.8 27B?
- Per 1M output tokens, Qwen3.8 2.4T A95B is ¥1,055.5 and Qwen3.8 27B is ¥571.84 on FastMetal (yen, before tax), so Qwen3.8 27B is cheaper.
- How do the context windows of Qwen3.8 2.4T A95B and Qwen3.8 27B compare?
- Qwen3.8 2.4T A95B takes 1,048,576 tokens; Qwen3.8 27B takes 1,000,000.
- Can I use Qwen3.8 2.4T A95B and Qwen3.8 27B with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "qwen3.8-2.4t-a95b" or "qwen3.8-27b" 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 2.4T A95B and Qwen3.8 27B from the browser chat and the API. No monthly fee.