# OpenAI — GPT-5.3-Codex

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This file is the record of one model version: what the model registry states
about it, OpenAI's launch post, the first-party posts this record
holds about it, the outlets that reported on those posts, and other companies'
announcements that it runs on their platforms. A model ranks nothing here and
nothing is composed: each date names whose it is, and a field nothing states is
`not stated` rather than missing.

- This model's page: https://forck.live/models/gpt-5-3-codex
- OpenAI's page: https://forck.live/company/openai
- Every model: https://forck.live/models
- Catalogue: https://forck.live/llms.txt

## Model

- Name: GPT-5.3-Codex
- Company: OpenAI (openai.com)
- Launch post: Introducing GPT-5.3-Codex — https://forck.live/items/281-introducing-gpt-5-3-codex
- Announced: 2026-02-05
- Launch source: https://openai.com/index/introducing-gpt-5-3-codex
- Launch chosen by: a person, pinned in the model registry
- Released (per models.dev): 2026-02-05
- Listed (per OpenRouter): 2026-02-24
- Open weights: no
- Posts about it: 2
- Outlets named under its posts: 0
- OpenRouter id: openai/gpt-5.3-codex — https://openrouter.ai/openai/gpt-5.3-codex

## Posts about it

_OpenAI's own posts whose title names GPT-5.3-Codex, and its launch post, in the record's order: dated newest first, undated last. The record reads the newest 50 first-party posts mentioning the model, every company's together, so a model mentioned more often than that lists the newest of them._

Every entry is one first-party announcement, and carries the same eight fields
in this order before any others:

    Company · Announced · Category · Coverage · Announcement · Group · Source · Record

`Source` is the company's own page the announcement was traced to and `Record`
is this site's page for it. Both are safe to cite.

`Coverage` is a number of outlets, or `not counted` — which means this record
reached no count of its own, never that nobody wrote about it.

`Category` is this tracker's own analysis, and is authoritative wherever it is
stated. `not stated` means either that nothing has analysed the post yet or
that the analysis placed it outside this taxonomy; neither is a verdict about
the announcement.

`Announcement` is whether the post is news of something the company did, rather
than a how-to, a customer story, a changelog listing or a staffing note.

`Group` is which of this record's groups the entry falls in, carried on the
entry itself so it holds where the groups are headings and where they are not.
One of: `models`, `covered`, `announcements`, `routine`.

Anything after `Record` is held detail that only some announcements carry.

### OpenAI — GPT-5.3-Codex System Card

- Company: OpenAI (openai.com)
- Announced: 2026-02-05
- Category: new-model
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://openai.com/index/gpt-5-3-codex-system-card
- Record: https://forck.live/items/282-gpt-5-3-codex-system-card
- Subject: GPT / ChatGPT / API

OpenAI announces GPT-5.3-Codex, described as the most capable agentic coding model to date, combining the coding performance of GPT-5.2-Codex with the reasoning and knowledge capabilities of GPT-5.2.

### OpenAI — Introducing GPT-5.3-Codex

- Company: OpenAI (openai.com)
- Announced: 2026-02-05
- Category: new-model
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://openai.com/index/introducing-gpt-5-3-codex
- Record: https://forck.live/items/281-introducing-gpt-5-3-codex
- Subject: GPT / ChatGPT / API

OpenAI introduced GPT-5.3-Codex, a Codex-native agent that combines frontier coding performance with general reasoning for long-horizon, real-world technical work.

## Who reported on it

_This record names no outlet that reported on these posts._

## Where it runs

_Other companies' own announcements naming GPT-5.3-Codex and OpenAI — each is that company's post, not OpenAI's._

### Amp — GPT‐5.3‐Codex

- Company: Amp (ampcode.com)
- Announced: 2026-02-19
- Category: model-update
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://ampcode.com/news/gpt-5.3-codex
- Record: https://forck.live/items/7755-gpt-5-3-codex
- Subject: Amp

Amp announced that GPT-5.3-Codex now powers its deep mode, claiming it is better than GPT-5.2-Codex in every dimension.

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Record: https://forck.live/models/gpt-5-3-codex
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md