MiMo-V2.5-Pro vs Qwen3.8 Max
Pricing, context window and real answers (August 2026)
MiMo-V2.5-Pro (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-Pro |  Qwen3.8 Max | |
|---|---|---|
| Provider | Xiaomi | Qwen |
| Input (per 1M tokens) | ¥77.73 | ¥357.4 |
| Output (per 1M tokens) | ¥155.47 | ¥1,072.2 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥155 | ¥894 |
| Context window | 1,050,000 tokens | 1,000,000 tokens |
| Release date | 4/22/2026 | 8/3/2026 |
| Input modalities | text | text, image |
| Arena · overall | #38 · ELO 1,465 | Unranked |
| Arena · Japanese | #44 · ELO 1,422 | Unranked |
| Arena · coding | #26 · ELO 1,519 | Unranked |
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-Pro: ¥155.47 per 1M output tokens, 85% less than Qwen3.8 Max.
- For long documents, MiMo-V2.5-Pro: 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-Pro
## Counting the r's in "strawberry"
Let me go through each letter one by one:
| Position | Letter | Is it 'r'? |
|----------|--------|------------|
| 1 | s | No |
| 2 | t | No |
| 3 | **r** | ✅ Yes (#1) |
| 4 | a | No |
| 5 | w | No |
| 6 | b | No |
| 7 | e | No |
| 8 | **r** | ✅ Yes (#2) |
| 9 | **r** | ✅ Yes (#3) |
| 10 | y | No |
**There are 3 r's in "strawberry."**
The word breaks down as **straw·ber·ry**, and the r's appear at the end of "staw" and then twice in the double-r of "rry."
8.3s313 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-Pro
# Fixing `Cannot read properties of undefined (reading 'map')`
## The Problem
The error means `users` is `undefined` when the component first renders. This typically happens when:
1. **The parent component hasn't passed the `users` prop**
2. **The data is being fetched asynchronously and isn't available yet**
3. **The prop name is misspelled in the parent**
For example, the parent might be rendering it like this:
```jsx
// ❌ No users prop passed — `users` will be undefined
<UserList />
```
## Solutions
### 1. Add a Default Prop Value (Simple Fix)
```jsx
function UserList({ users = [] }) {
return (
<ul>
{users.map(user => <li key={user.id}>{user.name}</li>)}
</ul>
);
}…
14.4s680 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-Pro
Subject: Revised Timeline for [Project Name] Delivery
Dear [Client Name],
I hope this message finds you well. I am writing to provide you with an important update regarding the delivery timeline for [Project Name].
During the final stages of integration testing, our team encountered unexpected technical challenges that require additional time to resolve. While we have made significant progress, ensuring the quality and stability of the solution remains our top priority. We have carefully assessed the situation and, as a result, the project delivery will be delayed by approximately two weeks.
We sincerely apologize for any inconvenience this may cause. We understand the importance…
15.9s671 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-Pro or Qwen3.8 Max?
- Per 1M output tokens, MiMo-V2.5-Pro is ¥155.47 and Qwen3.8 Max is ¥1,072.2 on FastMetal (yen, before tax), so MiMo-V2.5-Pro is cheaper.
- How do the context windows of MiMo-V2.5-Pro and Qwen3.8 Max compare?
- MiMo-V2.5-Pro takes 1,050,000 tokens; Qwen3.8 Max takes 1,000,000.
- Can I use MiMo-V2.5-Pro and Qwen3.8 Max with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "mimo-v2.5-pro" 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-Pro and Qwen3.8 Max from the browser chat and the API. No monthly fee.