OpenAI · First-party API · LLM

gpt-5.3-codex

Shutdown scheduledShuts down on Apr 1, 2027179 days left

Provider-recommended replacement: gpt-6-sol

2 notices

Shutdown scheduled179 days left

Shuts down on Apr 1, 2027

OpenAI lists Apr 1, 2027 as the shutdown date. Listed model identifier.

Hosting route
First-party API
Affected scope
Listed model identifier
Replacement
gpt-6-sol
Announced
Oct 1, 2026
First seen by ModelClock
Oct 3, 2026

What the provider published

developers.openai.com ↗

| Apr 1, 2027 | gpt-5.3-codex | gpt-6-sol |

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Release announced

Released on Feb 24, 2026

OpenAI announced this model on 2026-02-24. API: v1/responses.

Hosting route
First-party API
Affected scope
API: v1/responses
Announced
Feb 24, 2026
First seen by ModelClock
Oct 3, 2026

What the provider published

developers.openai.com ↗

Released gpt-5.3-codex to the Responses API.

Read from the provider's text; the quote is the provider's exact lines.

Revision history

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Same model elsewhere

Each provider and hosting route sets its own dates.