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Gemini 3.8 Flash

Google's Gemini 3.8 Flash is a fast chatbot model that writes, answers questions, and understands images and video, offered to developers online.

Release page →

The basics

Released

Sep 2
Jul 9

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.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.
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.

Knowledge cutoff

The latest events it learned about

Not published
February 2026

Download

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

Where to use it

Google's app: Gemini ↗Also for developers, through an API
OpenAI's app: ChatGPT ↗Also for developers, through an API

Price and limits, for developers

Input

Per million tokens

$0.75Cheaper
$4.00

Output

Per million tokens

$3.75Cheaper
$20.00

Cached input

Per million tokens

$0.075Cheaper
$0.40

Context window

How much it takes in at once

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

Longest answer

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

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

159#22 of 237
163#12 of 237Higher

GPT-5.6 Sol scores 4 points higher.

Chat answers, by people's votes

LMArena text, adjusted for style · LMArena

1,498#9 of 86
1,485#19 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

1,584#34 of 85
1,615#28 of 85Higher

In blind votes, people pick GPT-5.6 Sol over Gemini 3.8 Flash about 55% 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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