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OpenAI

GPT-5.6 Sol

Release page →
Moonshot AI

Kimi K2.7 Code

Release page →

The basics

Released

Jul 9
Jun 12

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.
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.Watches video: Understands video clips you share with it.

Knowledge cutoff

The latest events it learned about

February 2026More recent
January 2025

Download

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

Where to use it

OpenAI's app: ChatGPT ↗Also for developers, through an API
Moonshot AI's app: Kimi ↗

Price and limits, for developers

Input

Per million tokens

$4.00
$0.95Cheaper

Output

Per million tokens

$20.00
$4.00Cheaper

Cached input

Per million tokens

$0.40
$0.19Cheaper

Context window

How much it takes in at once

1.05M tokens about 790,000 wordsBigger
262K tokens about 200,000 words

Longest answer

128K tokens about 96,000 words
Not listed

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

163#11 of 235Higher
151#59 of 235

GPT-5.6 Sol scores 12 points higher, a big step.

Chat answers, by people's votes

LMArena text, adjusted for style · LMArena

1,485#19 of 86
Not ranked

Only GPT-5.6 Sol is in this ranking, which lists the most-voted models.

Building apps, by people's votes

LMArena WebDev · LMArena

1,615#28 of 85Higher
1,474#65 of 85

In blind votes, people pick GPT-5.6 Sol over Kimi K2.7 Code about 69% 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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