Still useful in the API for computer use at a lower price than newer OpenAI flagships, though it has left Codex.

Kenning's take

What it does

GPT-5.4 was OpenAI's flagship model for professional work when it launched in March 2026, and the first general model from OpenAI with built-in computer use through the API. It launched in ChatGPT as GPT-5.4 Thinking for Plus, Team and Pro users, in Codex and in the API. It left Codex for ChatGPT sign-ins on 31 August 2026 but remains in the API.

• 1.05M-token context window
• Built-in computer use via the Responses API
• Tool search
• Text and image input
• Configurable reasoning effort

Who it suits. Developers who need a long-context model with computer use at a lower price than newer flagships.

Key facts

Category

AI models

Part of

ChatGPT

Made by

OpenAI

Based in

United States

Released

5 March 2026

How to get it

OpenAI API (model gpt-5.4); launched in ChatGPT paid plans, current ChatGPT availability not confirmed; removed from Codex for ChatGPT sign-in on 31 August 2026

Works on

API, Codex (API key)

In the UK

Yes

API price

$2.50 per million input tokens, $15 per million output (2x input and 1.5x output above 272K input tokens)

Reviews and write-ups

• The Decoder 2026-03-05
• Tom's Guide 2026-03-05

FAQ

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