# GPT-5.3-Codex System Card

DevFeed: [GPT-5.3-Codex System Card](<https://devfeed.tech/articles/gpt-5-3-codex-system-card-6421.md>)

Original publisher: [Read original article](<https://openai.com/index/gpt-5-3-codex-system-card>)

Published: 2026-02-05T00:00:00Z

Content type: article

Language: en

Sources: [OpenAI News](<https://devfeed.tech/sources/openai-news.md>)

Topics: [coding](<https://devfeed.tech/topics/coding.md>), [agentic-coding](<https://devfeed.tech/topics/agentic-coding.md>), [codex](<https://devfeed.tech/topics/codex.md>), [Cybersecurity](<https://devfeed.tech/topics/cybersecurity.md>), [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [Security & Privacy](<https://devfeed.tech/topics/security-privacy.md>)

Tags: [agentic-coding](<https://devfeed.tech/tags/agentic-coding.md>), [ai](<https://devfeed.tech/tags/ai.md>), [codex](<https://devfeed.tech/tags/codex.md>), [coding](<https://devfeed.tech/tags/coding.md>), [cybersecurity](<https://devfeed.tech/tags/cybersecurity.md>), [publication](<https://devfeed.tech/tags/publication.md>), [research](<https://devfeed.tech/tags/research.md>), [safety](<https://devfeed.tech/tags/safety.md>), [tool](<https://devfeed.tech/tags/tool.md>)

## AI overview

GPT-5.3-Codex is presented as an agentic coding model that combines coding performance with reasoning and professional knowledge for long-running research, tool-use, and complex execution tasks. The system card highlights its cybersecurity safeguards and precautionary treatment as a potentially high-capability model in that domain.

## Source excerpt

GPT-5.3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT-5.2-Codex with the reasoning and professional knowledge capabilities of GPT-5.2.