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Model Launch 1 min read

Introducing GPT-5.3-Codex

Source: OpenAI Blog
February 5, 2026 · 7mo ago
Visual for Introducing GPT-5.3-Codex

Summary

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.

Why It Matters

New model releases reshape what developers can build. As capabilities advance, existing applications can be upgraded and entirely new use cases become feasible — making it critical for engineers to evaluate these releases early.

#agent

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