---
name: Models
slug: models
organization_slug: openai
source_count: 1
canonical: https://releases.sh/openai/models
---

# Models

OpenAI's foundation models (GPT and o-series) and updates to model availability and behavior.

## Sources (1)

- [Release Notes](https://releases.sh/openai/model-release-notes) — `scrape`

## Recent Releases

_Summaries below — fetch the release's `canonical` URL for full content, or `url` for the original source._

<Release source="model-release-notes" date="May 28, 2026" published="2026-05-28T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#retiring-openai-o3-and-gpt-4-5" canonical="https://releases.sh/release/rel_wRREYqExThdLWBlBo5LaB" truncated="true">
### Retiring OpenAI o3 and GPT-4.5

Continuing to retire older models with limited usage in ChatGPT. OpenAI o3 will be retired from ChatGPT on August 26, 2026 following a 90-day sunset p...
</Release>

<Release source="model-release-notes" date="May 28, 2026" published="2026-05-28T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#gpt-5-5-instant-update" canonical="https://releases.sh/release/rel_TLSYDxnK4jz4JQHXkM0OU" truncated="true">
### GPT-5.5 Instant Update

Updated GPT-5.5 Instant in ChatGPT and the API to improve response style and quality. Responses are now easier to read, more natural in everyday conve...
</Release>

<Release source="model-release-notes" date="March 18, 2026" published="2026-03-18T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#gpt-5-4-mini-in-chatgpt" canonical="https://releases.sh/release/rel_6epfYuLmBQ-Ox53HQWyOs" truncated="true">
### GPT-5.4 mini in ChatGPT

Rolling out GPT-5.4 mini in ChatGPT. GPT-5.4 mini is available to Free and Go users via the "Thinking" feature in the + menu. For all other users, GPT...
</Release>

<Release source="model-release-notes" date="March 16, 2026" published="2026-03-16T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#gpt-5-3-instant-update" canonical="https://releases.sh/release/rel_WZTptOs6CTZWynOUYQfYl" truncated="true">
### GPT-5.3 Instant update

Rolling out an update to GPT-5.3 Instant that improves follow-up tone and reduces teaser-style phrasing in responses (e.g., "If you want…", "You'll ne...
</Release>

<Release source="model-release-notes" date="March 11, 2026" published="2026-03-11T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#retiring-gpt-5-1-models" canonical="https://releases.sh/release/rel_Jaf5AN8o8IFhVnhqrVT67" truncated="true">
### Retiring GPT-5.1 models

As of March 11, 2026, GPT-5.1 models are no longer available in ChatGPT. This applies to GPT-5.1 Instant, GPT-5.1 Thinking, and GPT-5.1 Pro. Existing ...
</Release>

<Release source="model-release-notes" date="March 5, 2026" published="2026-03-05T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#gpt-5-4-thinking-in-chatgpt" canonical="https://releases.sh/release/rel_i_DjeUyyN3iAdJI-sVg9z" truncated="true">
### GPT-5.4 Thinking in ChatGPT

GPT-5.4 brings together the best of recent advances in reasoning, coding, and agentic workflows into a single frontier model. It incorporates industry...
</Release>

<Release source="model-release-notes" date="February 13, 2026" published="2026-02-13T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#retiring-gpt-4o-and-other-legacy-models" canonical="https://releases.sh/release/rel_xDDF7UD2Hme873XfUiHqs" truncated="true">
### Retiring GPT-4o and other legacy models

Retired GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini from ChatGPT. Also retiring GPT-5 (Instant and Thinking), as previously announced. There are...
</Release>

<Release source="model-release-notes" date="February 10, 2026" published="2026-02-10T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#gpt-5-2-instant-update" canonical="https://releases.sh/release/rel_xJIrMU_AIn6UAtPqNIrDz" truncated="true">
### GPT-5.2 Instant Update

Making an update to GPT-5.2 Instant in ChatGPT and the API that improves response style and quality. Responses are now more measured and grounded in t...
</Release>

<Release source="model-release-notes" date="February 5, 2026" published="2026-02-05T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#introducing-gpt-5-3-codex" canonical="https://releases.sh/release/rel_gWMrywM_Itt9xXaNvvRL0" truncated="true">
### Introducing GPT-5.3-Codex

Launched GPT-5.3-Codex, the most capable agentic coding model yet. This model is the first that combines Codex + GPT-5 training stacks, bringing toget...
</Release>

<Release source="model-release-notes" date="February 4, 2026" published="2026-02-04T00:00:00.000Z" url="https://help.openai.com/en/articles/9624314-model-release-notes#update-on-thinking-time-settings-for-gpt-5-2-thinking-in-cha" canonical="https://releases.sh/release/rel_J9MxWByotXV1jaAU8xzXp" truncated="true">
### Update on thinking time settings for GPT-5.2 Thinking in ChatGPT

Series of updates to thinking time settings for GPT-5.2 Thinking:

- January 10, 2026: Lowered Standard and Light thinking time as users prefer faster...
</Release>