Gemini 3.1 Pro Preview vs Qwen3.8 Max
Pricing, context window and real answers (September 2026)
Gemini 3.1 Pro Preview (Google) 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
 Gemini 3.1 Pro Preview |  Qwen3.8 Max | |
|---|---|---|
| Provider | Qwen | |
| Input (per 1M tokens) | ¥357.4 | ¥357.4 |
| Output (per 1M tokens) | ¥2,144.4 | ¥1,072.2 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥1,430 | ¥894 |
| Context window | 1,048,576 tokens | 1,000,000 tokens |
| Release date | 2/19/2026 | 8/3/2026 |
| Input modalities | audio, file, image, text, video | text, image |
| Throughput (p50) | — | — |
| Arena · overall | #15 · ELO 1,487 | #22 · ELO 1,481 |
| Arena · Japanese | #9 · ELO 1,494 | #18 · ELO 1,469 |
| Arena · coding | #28 · ELO 1,520 | #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?
- On price, Qwen3.8 Max: ¥1,072.2 per 1M output tokens, 50% less than Gemini 3.1 Pro Preview.
- On the Overall arena board, Gemini 3.1 Pro Preview ranks higher (#15; Qwen3.8 Max is #22).
- On the Japanese arena board, Gemini 3.1 Pro Preview ranks higher (#9; Qwen3.8 Max is #18).
- On the Coding arena board, Qwen3.8 Max ranks higher (#24; Gemini 3.1 Pro Preview is #28).
- For long documents, Gemini 3.1 Pro Preview: a 1,048,576-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.
Gemini 3.1 Pro Preview
There are **3** 'r's in the word 'strawberry'.
Here is the step-by-step breakdown of the spelling:
1. **s** - not an 'r'
2. **t** - not an 'r'
3. **r** - **1st 'r'**
4. **a** - not an 'r'
5. **w** - not an 'r'
6. **b** - not an 'r'
7. **e** - not an 'r'
8. **r** - **2nd 'r'**
9. **r** - **3rd 'r'**
10. **y** - not an 'r'
Therefore, the total count is 3.
5.3s503 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…
Gemini 3.1 Pro Preview
### The Cause
This error occurs because the `users` prop being passed to your `UserList` component is currently `undefined`.
In JavaScript, you can only use the `.map()` method on arrays. Because `users` is `undefined` (often due to data not finishing an API fetch yet, or the parent component forgetting to pass the prop), Node/React throws an error when it tries to read `.map`.
### How to Fix It
You can fix this in a few different ways, depending on how you want your application to behave.
#### Fix 1: Assign a Default Value (Recommended)
The cleanest way to handle this is to assign a default empty array to `users` in your component's parameters. If `users` is undefined, it defaults to…
13.2s1511 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…
Gemini 3.1 Pro Preview
Subject: Project Update: Revised Delivery Timeline for [Project Name]
Dear [Client Name],
I hope this email finds you well.
I am writing to provide a status update on [Project Name]. While our team has made great progress, we need to adjust our final delivery date by two weeks, moving the handover from [Original Date] to [New Date].
During our recent integration testing phase, we uncovered some unexpected technical challenges regarding how the new components communicate with [mention a brief, high-level detail, e.g., the legacy database / third-party API / existing systems].
I sincerely apologize for the inconvenience this delay may cause to your internal planning. We do not take cha…
14.0s1523 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, Gemini 3.1 Pro Preview or Qwen3.8 Max?
- Per 1M output tokens, Gemini 3.1 Pro Preview is ¥2,144.4 and Qwen3.8 Max is ¥1,072.2 on FastMetal (yen, before tax), so Qwen3.8 Max is cheaper.
- How do the context windows of Gemini 3.1 Pro Preview and Qwen3.8 Max compare?
- Gemini 3.1 Pro Preview takes 1,048,576 tokens; Qwen3.8 Max takes 1,000,000.
- Which ranks higher, Gemini 3.1 Pro Preview or Qwen3.8 Max?
- Gemini 3.1 Pro Preview ranks higher on the public arena (Gemini 3.1 Pro Preview #9, Qwen3.8 Max #18). Ranks move as the leaderboard updates.
- Can I use Gemini 3.1 Pro Preview and Qwen3.8 Max with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "gemini-3.1-pro-preview" 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 Gemini 3.1 Pro Preview and Qwen3.8 Max from the browser chat and the API. No monthly fee.