Introducing GPT-5.3-Codex

OpenAI Blog ·

OpenAI released GPT-5.3-Codex, its most capable agentic coding model combining frontier coding performance with general reasoning for long-horizon technical work.

Categories: Model Releases, Products to Try

Excerpt

GPT-5.3-Codex is a Codex-native agent that pairs frontier coding performance with general reasoning to support long-horizon, real-world technical work.

Read at source: https://openai.com/index/introducing-gpt-5-3-codex