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GPT-5.1 Instant

Release page →

GPT-5.1-Codex-Max

Release page →

The basics

Released

Nov 13, 2025
Nov 19, 2025

What it does

Text and chat: Writes, answers questions and holds a conversation.
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.

Knowledge cutoff

The latest events it learned about

Not published
Not published

Download

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

Where to use it

OpenAI's app: ChatGPT ↗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

Not listed
$1.25

Output

Per million tokens

Not listed
$10.00

Cached input

Per million tokens

Not listed
$0.125

Context window

How much it takes in at once

Not listed
400K tokens about 300,000 words

Longest answer

Not listed
128K tokens about 96,000 words

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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