GPT-5.3 Instant

OpenAI · GPT Instant line · lightweight

Released March 3, 2026Replaced by GPT-5.3 Instant MiniLine discontinued Oct 7, 2026

GPT-5.3 Instant was released by OpenAI on March 3, 2026, as a lightweight model in the GPT Instant line.

Release 4 of 7 in the GPT Instant line.
Came 82 days after GPT-5.2 Instant, released Dec 11, 2025.
Replaced by GPT-5.3 Instant Mini on April 9, 2026, 37 days later.
Its usual gap between releases was about 37 days; the line's last release was on July 6, 2026.

No detailed card for this model: we only add numbers published by the maker or by independent benchmarks. Sources: OpenAI · OpenAI

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Where the GPT Instant line stands

GPT-5.5 Instant Mini 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 Instant

OpenAI · lightweight line

Latest: GPT-5.5 Instant Mini · Jul 6, 2026

DiscontinuedOfficially discontinued on Oct 7, 2026

It replaces GPT-5.3 Instant Mini as the fallback model ChatGPT users get after reaching their GPT-5.5 Instant or Auto limits; it does not appear in the model picker or the API.

What changed in GPT-5.5 Instant Mini →

Days since last release

110

days

Usual gap

days

Recent gaps

GPT-5.5 Instant Mini · Jul 2026

GPT-5.5 Instant · May 2026

GPT-5.3 Instant Mini · Apr 2026

GPT-5.3 Instant · Mar 2026

Every GPT Instant release

Newest first. See the full line with every card →

Jul 6, 2026GPT-5.5 Instant Mini
May 5, 2026GPT-5.5 Instant
Apr 9, 2026GPT-5.3 Instant Mini
Mar 3, 2026GPT-5.3 Instant · this page
Dec 11, 2025GPT-5.2 Instant
Nov 12, 2025GPT-5.1 Instant
Aug 7, 2025GPT-5 Instant