MiMo-V2.5 vs Qwen3.8 Max
Pricing, context window and real answers (August 2026)
MiMo-V2.5 (Xiaomi) 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
| MiMo-V2.5 |  Qwen3.8 Max | |
|---|---|---|
| Provider | Xiaomi | Qwen |
| Input (per 1M tokens) | ¥25.02 | ¥357.4 |
| Output (per 1M tokens) | ¥50.04 | ¥1,072.2 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥50 | ¥894 |
| Context window | 1,050,000 tokens | 1,000,000 tokens |
| Release date | 4/22/2026 | 8/3/2026 |
| Input modalities | text, audio, image, video | text, image |
| Arena · overall | #92 · ELO 1,434 | #20 · ELO 1,479 |
| Arena · Japanese | #137 · ELO 1,322 | #14 · ELO 1,485 |
| Arena · coding | #76 · ELO 1,491 | #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, MiMo-V2.5: ¥50.04 per 1M output tokens, 95% less than Qwen3.8 Max.
- On the Overall arena board, Qwen3.8 Max ranks higher (#20; MiMo-V2.5 is #92).
- On the Japanese arena board, Qwen3.8 Max ranks higher (#14; MiMo-V2.5 is #137).
- On the Coding arena board, Qwen3.8 Max ranks higher (#26; MiMo-V2.5 is #76).
- For long documents, MiMo-V2.5: a 1,050,000-token context window against 1,000,000 for Qwen3.8 Max.
- 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.
MiMo-V2.5
# Counting the 'r's in 'strawberry'
Let me spell the word out letter by letter:
| Position | Letter | Is it 'r'? |
|----------|--------|------------|
| 1 | **s** | ❌ |
| 2 | **t** | ❌ |
| 3 | **r** | ✅ (1) |
| 4 | **a** | ❌ |
| 5 | **w** | ❌ |
| 6 | **b** | ❌ |
| 7 | **e** | ❌ |
| 8 | **r** | ✅ (2) |
| 9 | **r** | ✅ (3) |
| 10 | **y** | ❌ |
## Answer: **3** 'r's
The three r's are found at positions **3**, **8**, and **9** in the word.
14.9s313 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…
MiMo-V2.5
This error occurs because your `users` prop is `undefined` when the component tries to call `.map()` on it. This usually happens when:
1. The parent component doesn't pass a `users` prop
2. The `users` data is still loading (asynchronous operation)
3. There's a typo in the prop name when passing from parent
## How to Fix It
### 1. Add Default Props or Prop Validation
Add a default value for the `users` prop:
```jsx
function UserList({ users = [] }) {
return (
<ul>
{users.map(user => <li key={user.id}>{user.name}</li>)}
</ul>
);
}
// Or with PropTypes
import PropTypes from 'prop-types';
function UserList({ users }) {
return (
<ul>
{users.map(user => <li key…
11.2s808 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…
MiMo-V2.5
**Subject:** Update on [Project Name] Delivery Timeline
Dear [Client Name],
I hope this message finds you well. I am writing to provide you with an important update regarding the timeline for [Project Name].
During recent integration testing, our team identified some unexpected technical challenges that require additional attention to ensure the quality and reliability you expect from our partnership. While we had initially planned to deliver the final product by [Original Delivery Date], we now anticipate a revised delivery date of **[New Delivery Date]** — a delay of approximately two weeks.
Please know that we take full responsibility for this adjustment and sincerely apologiz…
8.3s523 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, MiMo-V2.5 or Qwen3.8 Max?
- Per 1M output tokens, MiMo-V2.5 is ¥50.04 and Qwen3.8 Max is ¥1,072.2 on FastMetal (yen, before tax), so MiMo-V2.5 is cheaper.
- How do the context windows of MiMo-V2.5 and Qwen3.8 Max compare?
- MiMo-V2.5 takes 1,050,000 tokens; Qwen3.8 Max takes 1,000,000.
- Which ranks higher, MiMo-V2.5 or Qwen3.8 Max?
- Qwen3.8 Max ranks higher on the public arena (MiMo-V2.5 #137, Qwen3.8 Max #14). Ranks move as the leaderboard updates.
- Can I use MiMo-V2.5 and Qwen3.8 Max with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "mimo-v2.5" 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 MiMo-V2.5 and Qwen3.8 Max from the browser chat and the API. No monthly fee.