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Step 3.5 Flash

A Chinese AI lab's fast assistant model that anyone can free to download and use, offered through a hosting service for developers.

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Step 3.7 Flash

A Chinese AI lab's fast, efficient assistant that can read pictures and video, offered through a hosting service for developers building AI apps.

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The basics

Released

Jan 29
May 28

What it does

Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.
Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.Sees images: Understands pictures, screenshots and charts you share with it.Watches video: Understands video clips you share with it.

Knowledge cutoff

The latest events it learned about

January 2025
March 2026More recent

Download

FreeOpen weights
No: it runs on the maker's servers

Where to use it

No app known; download it insteadAlso for developers, through an API
No app knownAlso for developers, through an API

Price and limits, for developers

Input

Per million tokens

$0.105Cheaper
$0.202

Output

Per million tokens

$0.314Cheaper
$1.21

Cached input

Per million tokens

$0.021Cheaper
$0.04

Context window

How much it takes in at once

256K tokens about 190,000 words
256K tokens about 190,000 words

Longest answer

66K tokens about 49,000 words
Not listed

How they score

Neither model is in the public rankings trckr follows yet. New models usually appear within a few weeks of launch.

Green marks the better of the two on each row, red the other. Rows where one side isn't listed, or where the gap is too close to call, stay plain.

Popular comparisons

Not sure where to start? Which AI should I use? gives a pick for what you want to do. How to read AI rankings explains the numbers.

Rankings from LMArena and Epoch AI, both CC BY 4.0, updated . Developer prices, context windows and knowledge cutoffs from the labs' own listings on models.dev and from OpenRouter. The app links go to each maker's own app when no source says exactly where the model is available.

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