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OpenAI · First-party API · LLM

GPT-5.4

Capability changeCapability change announced Mar 17, 2026
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Notice

Capability change

Capability change announced Mar 17, 2026

OpenAI documents a capability change: “GPT-5.4 mini is now available in Codex as a fast, efficient model for lighter”

Hosting route
First-party API
Affected scope
Not stated in the notice
Announced
Mar 17, 2026
First seen by ModelClock
Oct 7, 2026

What the provider published

learn.chatgpt.com ↗

GPT-5.4 mini is now available in Codex as a fast, efficient model for lighter

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Same model elsewhere

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