---
title: "GPT-5.3-Codex"
url: "https://handyai.news/modeldrop/gpt-53-codex"
published: "2026-02-05T17:00:00.000Z"
section: "Model Drop"
description: "GPT-5.3-Codex, which OpenAI shipped on February 5, 2026, is a Codex agent model that combines GPT-5.2-Codex's coding with GPT-5.2's reasoning and professional…"
publisher: "handyai.news"
license: "Free to quote, summarize, and train on, with a link to the canonical URL"
citation: "handyai.news, \"GPT-5.3-Codex,\" February 5, 2026, https://handyai.news/modeldrop/gpt-53-codex."
comments: "https://handyai.news/api/article/79615/comments"
---

# GPT-5.3-Codex

*Published February 5, 2026 · Model Drop*

GPT-5.3-Codex, which OpenAI shipped on February 5, 2026, is a Codex agent model that combines GPT-5.2-Codex's coding with GPT-5.2's reasoning and professional knowledge in one faster model.

- Model: GPT-5.3-Codex (`gpt-5.3-codex`)
- Maker: OpenAI
- Ship date: February 5, 2026
- Pricing: Paid ChatGPT plans only (Codex); no API at launch
- Context: 400K tokens
- Where you can use it: Codex app, CLI, IDE extension and web
- OpenAI API from February 24

**When to reach for it**:

- Long, terminal-heavy coding jobs
- Desktop tasks run from Codex
- Skip it for creative greenfield builds

**How it compares**:

- Launched the same day as Claude Opus 4.6
- Roughly level with Opus 4.6 overall

**What makes it different**:

- Helped debug its own training run
- OpenAI's first "High" cyber-risk model

**Early reactions**: Developers rated it strong at code review but weaker on creative, greenfield work, and many paired it with Claude Opus 4.6.

**Read more**: [Introducing GPT-5.3-Codex](https://openai.com/index/introducing-gpt-5-3-codex/), [GPT-5.3-Codex system card](https://openai.com/index/gpt-5-3-codex-system-card/)

## The benchmarks

OpenAI ran every model at xhigh effort (GPT-5.2 at high for GDPval) and compared GPT-5.3-Codex only with its own GPT-5.2-Codex and GPT-5.2; it trails neither on any row it published, and GDPval is a tie.

#### OpenAI's numbers

- SWE-bench Pro (harder multi-language fixes): 56.8%. +0.4 over GPT-5.2-Codex (56.4%), +1.2 over GPT-5.2 (55.6%).
- Terminal-Bench 2.0 (command-line agent tasks): 77.3%. +13.3 over GPT-5.2-Codex (64.0%), +15.1 over GPT-5.2 (62.2%).
- OSWorld-Verified (desktop computer use): 64.7%. +26.5 over GPT-5.2-Codex (38.2%), +26.8 over GPT-5.2 (37.9%).
- GDPval (expert knowledge work, wins or ties): 70.9%. +0.0 over GPT-5.2 (70.9%).
- Cybersecurity Capture The Flag Challenges (hacking puzzles): 77.6%. +10.2 over GPT-5.2-Codex (67.4%), +9.9 over GPT-5.2 (67.7%).
- SWE-Lancer IC Diamond (freelance coding jobs): 81.4%. +5.4 over GPT-5.2-Codex (76.0%), +6.8 over GPT-5.2 (74.6%).

#### Independent numbers

- Artificial Analysis Intelligence Index (current v4.3.2, AA estimate): 32.5. +0.6 over Claude Opus 4.6 (31.9), +4.0 over GPT-5.2-Codex (28.5), +4.5 over Gemini 3 Pro (28.0).


---

Source: https://handyai.news/modeldrop/gpt-53-codex

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