Retired ChatGPT Models

Every model OpenAI removed from ChatGPT, with dates: GPT-4o, GPT-4.1, o4-mini and GPT-5 on Feb 13, 2026, GPT-5.1 on Mar 11, GPT-5.2 on Jun 12, GPT-4.5 on Jun 26, o3 on Aug 26 and GPT-5.5 on Oct 14, 2026. Models generally stay 90 days after a successor arrives.

OpenAI removed every model older than GPT-5.6 from ChatGPT during 2026: GPT-4o, GPT-4.1, GPT-4.1 mini, o4-mini and GPT-5 on Feb 13, 2026, GPT-5.1 on Mar 11, GPT-5.2 on Jun 12, GPT-4.5 on Jun 26, o3 on Aug 26 and GPT-5.5 on Oct 14, 2026. OpenAI's rule of thumb: "Models will generally remain available in ChatGPT for 90 days after a successor is released." Old conversations stay readable and continue on a current model. Most retired models stay longer in the OpenAI API, which has its own shutdown dates.

Quick facts

The rule	About 90 days after a successor, stated Jun 12, 2026; GPT-4.5 got a 30-day notice
Biggest retirement	Feb 13, 2026: GPT-4o, GPT-4.1, GPT-4.1 mini, o4-mini, GPT-5
Latest retirement	GPT-5.5, Oct 14, 2026 (ChatGPT, Work and Codex)
Older models still selectable	GPT-5.6 Sol, GPT-5.6 Sol Pro, as of Nov 6, 2026
Old chats	Continue on current models; nothing is deleted

Models retired from ChatGPT

Model	Removed from ChatGPT	What took over
GPT-4o	Feb 13, 2026; business custom GPTs Apr 3, 2026	GPT-5 line; see GPT-4o
GPT-4.1, GPT-4.1 mini	Feb 13, 2026	GPT-5 line
OpenAI o4-mini	Feb 13, 2026	GPT-5 thinking levels
GPT-5 (Instant and Thinking)	Feb 13, 2026 (Enterprise and GPT-5 Pro through Feb 19)	GPT-5.1, then GPT-5.2
GPT-5.1 Instant, Thinking, Pro	Mar 11, 2026	GPT-5.3 Instant, GPT-5.4 Thinking, GPT-5.4 Pro
GPT-5 Thinking mini (as a choice)	Announced Mar 18, 2026 for 30 days later	GPT-5.4 mini (still on the pricing table as of Nov 6, 2026)
GPT-5.2 Instant, Thinking, Pro	Jun 12, 2026	GPT-5.5
GPT-4.5	Jun 26, 2026 (Jun 27 on another OpenAI page)	GPT-5.5
OpenAI o3	Aug 26, 2026, after a 90-day notice	GPT-5.6 Sol thinking levels
GPT-5.3 Instant (paid fallback choice)	Kept three months after May 5, 2026	GPT-5.5 Instant
GPT-5.5 and GPT-5.5 Pro	Oct 14, 2026, also from Work and Codex	GPT-6.1 Sol (paid) or GPT-6 Luna (Free and Go) in Codex

The successor column follows OpenAI's notes where they name one; where they do not, it gives the model that was current at the time.

15:25 Before 2026, o3-pro replaced o1-pro on Jun 10, 2025, and GPT-5 replaced GPT-4o, o3, o4-mini, GPT-4.1 and GPT-4.5 as the default on Aug 7, 2025, though some stayed selectable until the dates above. For the full sequence, see GPT Model History.

Other retirements inside ChatGPT

Codex with ChatGPT sign-in: GPT-5.4 and GPT-5.4 mini on Aug 31, 2026 (replaced by GPT-5.6 Terra and Luna), GPT-5.3-Codex-Spark on Sep 14, 2026, and GPT-5.5 on Oct 14, 2026 at 19:00 UTC. API-key sessions are not affected. See Codex Models.
The DALL-E GPT: the official DALL-E custom GPT retired on Aug 30, 2026. See DALL-E.
Custom GPTs themselves retire on Dec 11, 2026. See Custom GPTs.

Retired from ChatGPT is not retired from the API

OpenAI's notices for the February retirements said plainly there was no change to the API. The API keeps its own timetable (OpenAI API docs):

API models	Shutdown	Replacement
GPT-4.5-preview	Jul 14, 2025	gpt-4.1
GPT-4, GPT-4 Turbo, gpt-3.5-turbo, gpt-4.1-nano, o1, o1-pro, o3-mini, o4-mini	Oct 23, 2026	Not named in the summary read
gpt-5, gpt-5-mini, gpt-5-nano, gpt-5-pro, o3, o3-pro	Dec 11, 2026	gpt-5.6-sol, terra or luna
gpt-4o, gpt-4o-mini, gpt-4.1, gpt-4.1-mini	Jan 14, 2027	gpt-6-luna
gpt-5.1, gpt-5.3-codex, gpt-5.4-nano	Apr 1, 2027	gpt-6-sol (nano: gpt-6-luna)

Source: Deprecations, OpenAI API docs, read Nov 6, 2026.

GPT-5.5 is still sold in the API ($5 / $30 per 1M tokens) even though it left ChatGPT. If a model you rely on in ChatGPT is going away, the API is the only way to keep using it, for as long as it lasts there.

Frequently asked questions

Where did GPT-4o go? OpenAI retired GPT-4o from ChatGPT on Feb 13, 2026, and from custom GPTs in Business, Enterprise and Edu after Apr 3, 2026. It stays in the API until Jan 14, 2027.

Where did GPT-4.5 go? GPT-4.5 left ChatGPT on Jun 26, 2026 after a 30-day notice (one OpenAI page says Jun 27), and conversations continued on GPT-5.5. Its API preview had already shut down on Jul 14, 2025.

Can I get a retired model back in ChatGPT? No. Once OpenAI retires a model from ChatGPT there is no setting to restore it, though OpenAI did bring GPT-4o back once, after the GPT-5 launch in August 2025, following user feedback. Some retired models remain in the API for a while.

How long does OpenAI keep old models in ChatGPT? OpenAI says models generally remain for 90 days after a successor is released. Paid plans have kept some older models under Legacy models or model configuration for about three months.

What happens to my old chats with a retired model? They stay in your history, and if you continue one, ChatGPT answers with a current model.