Alibaba · Works through problems step by step, slower to answer

Qwen 3 4B Thinking on iPhone

  • Most Capable
  • Tools (beta)
  • Reasoning

Qwen 3 4B Thinking is an open model from Alibaba that runs on your iPhone through MLX. It spends extra time working through hard problems before it answers. After the 2.3 GB download it works without an internet connection.

How to install it

Free download · iPhone, iOS 26.0 or later

Specifications

Company
Alibaba
Parameters
4B
Download size
2.3 GB
Minimum RAM
2.9 GB
Category
Most Capable
Tools
Tools (beta)
Reasoning
Yes, shows its thinking
License
Apache 2.0
Format
4-bit quantized, MLX

Numbers come straight from the model catalogue inside the app. Qwen 3 4B Thinking and its licence belong to Alibaba.

About Qwen 3 4B Thinking

What is Qwen 3 4B Thinking?

Qwen 3 4B Thinking is a 4-bit quantized MLX build of Alibaba’s model, packaged to run directly on Apple silicon instead of a remote server.

Qwen 3 4B Thinking is a reasoning model. It thinks before it answers, and Priobs shows that thinking in its own section above the reply, so you can follow how it got there.

What it is good at on iPhone

  • Multi-step reasoning
  • Maths and structured problem solving
  • Tasks where depth beats speed

Tool support for Qwen 3 4B Thinking is in beta: it can use Priobs tools like calendar and reminders, but expect the odd miss.

Trade-off: answers are slower, and tool support is in beta. For everyday tasks, Qwen 3 4B is quicker.

Device fit

Qwen 3 4B Thinking needs at least 2.9 GB of memory. Priobs checks your iPhone, hides models it does not have the memory for, and warns you if a model is close to the limit and may be unstable.

Setup

How to get it in Priobs.

One download over Wi-Fi and you are offline-ready for good.

  1. Open Priobs and go to the Model Library.

  2. Find Qwen 3 4B Thinking and tap Download (2.3 GB).

  3. Select it as your active model. Chats now work offline.

FAQ

Qwen 3 4B Thinking, answered.

General Priobs questions

Does Qwen 3 4B Thinking work without internet?

Yes. Once downloaded, Qwen 3 4B Thinking answers on your iPhone and works in airplane mode. Optional features like web search need a connection when you turn them on.

How much memory does Qwen 3 4B Thinking need?

At least 2.9 GB. Priobs hides models your iPhone does not have the memory for and warns you about ones that may be unstable.

Does Qwen 3 4B Thinking support tools?

Yes, in beta. Qwen 3 4B Thinking can use Priobs tools, but results are less reliable than with models marked Tools.

Does Qwen 3 4B Thinking send prompts to Alibaba?

No. Qwen 3 4B Thinking generates every answer on your iPhone. Your prompts never go to Alibaba or to us. Something leaves your phone only if you turn on an optional connected feature like web search, and Priobs asks first.

Other models

You can keep several installed at once.

Switching models takes one tap. A common setup: a small, fast model for quick questions and a bigger one for anything that needs more depth.

Compare every modelBest local LLMs for iPhone in 2026How to run an LLM on iPhone

Run Qwen 3 4B Thinking on your own iPhone.

Priobs is free to download with a free trial. Pick a model, and every answer is generated on your iPhone.

Free download · iPhone, iOS 26.0 or later · Cancel any time in App Store settings