Leaves ChatGPT and Codex on 14 October 2026, so from then on it's an API-only option at a fairly high $30 per million output tokens.

Kenning's take

What it does

GPT-5.5 is an OpenAI model for complex coding, computer use, research and knowledge work. It rolled out to ChatGPT Plus, Pro, Business and Enterprise users and to Codex in April 2026, with the API following a day later. OpenAI says it retires from ChatGPT and Codex on 14 October 2026, while staying in the API.

• 1.05M-token context window
• Built-in computer use, hosted shell and web search in the API
• Text and image input
• GPT-5.5 Pro variant for higher tiers
• Structured outputs and function calling

Who it suits. Paid ChatGPT users and developers doing long coding and research tasks.

Key facts

Category

AI models

Part of

ChatGPT

Made by

OpenAI

Based in

United States

Released

23 April 2026

How to get it

ChatGPT Plus, Pro, Business and Enterprise and Codex until 14 October 2026; OpenAI API (model gpt-5.5) after that

Works on

ChatGPT (web, desktop, mobile), Codex, API

In the UK

Yes

API price

$5 per million input tokens, $30 per million output

Reviews and write-ups

• PCWorld 2026-04-27

FAQ

Facts from the maker's own pages and the sources listed. Checked 2026-10-11.