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Claude Sonnet 4.6

Release page →

Gemini 3 Flash

The basics

Released

Feb 17
Dec 17, 2025

What it does

Text and chat: Writes, answers questions and holds a conversation.Code: Writes, explains and fixes code.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.Reads files: Reads documents such as PDFs.
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.Reads files: Reads documents such as PDFs.Listens: Understands speech and other sounds.Watches video: Understands video clips you share with it.

Knowledge cutoff

The latest events it learned about

August 2025More recent
January 2025

Download

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

Where to use it

Anthropic's app: Claude ↗Also for developers, through an API
Google's app: Gemini ↗

Price and limits, for developers

Input

Per million tokens

$3.00
$0.50Cheaper

Output

Per million tokens

$15.00
$3.00Cheaper

Cached input

Per million tokens

$0.30
$0.05Cheaper

Context window

How much it takes in at once

1M tokens about 750,000 words
1.05M tokens about 790,000 wordsBigger

Longest answer

128K tokens about 96,000 wordsLonger
66K tokens about 49,000 words

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

153#54 of 237
152#57 of 237

Too close to call: Claude Sonnet 4.6 and Gemini 3 Flash are within the margin of error.

Chat answers, by people's votes

LMArena text, adjusted for style · LMArena

1,472#39 of 86
1,473#38 of 86

Neck and neck: in blind votes, people pick each about as often as the other.

Building apps, by people's votes

LMArena WebDev · LMArena

1,522#50 of 85Higher
1,440#71 of 85

In blind votes, people pick Claude Sonnet 4.6 over Gemini 3 Flash about 62% of the time.

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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