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GPT-5.4 nano

OpenAI · GPT Luna line · lightweight

Released March 17, 2026Replaced by GPT-5.6 Luna

What changed

No verified summary yet. We only publish what the maker's own numbers support, so this card fills in as the sources come in.

Where the GPT Luna line stands

GPT-5.6 Luna is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

GPT-5.6 Luna

OpenAI · GPT Luna line · lightweight
Mid-cycle62 of ~114 days into its usual cycle

The lightest tier of the GPT-5.6 trio, positioned by OpenAI as the fast, affordable model: $0.20 per million input tokens and $1.20 per million output tokens after the 30 July price cut.

Released Jul 9, 2026 · what changed →
Days since last release
GPT-5.6 Luna · Jul 9, 2026
62
days
Usual gap
114
days
Recent gaps
GPT-5.6 Luna · Jul 2026
114

Every GPT Luna release

Newest first. See the full line with every card →

  1. Jul 9, 2026GPT-5.6 Luna
  2. Mar 17, 2026GPT-5.4 nano · this page

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